{"id":13776,"date":"2025-09-29T13:20:18","date_gmt":"2025-09-29T09:50:18","guid":{"rendered":"https:\/\/behinpolymerco.com\/types-of-additives-in-polymers-increasing-properties-and-performance\/"},"modified":"2025-12-15T11:17:41","modified_gmt":"2025-12-15T07:47:41","slug":"types-of-additives-in-polymers-increasing-properties-and-performance","status":"publish","type":"post","link":"https:\/\/behinpolymerco.com\/en\/types-of-additives-in-polymers-increasing-properties-and-performance\/","title":{"rendered":"Types of additives in polymers: increasing properties and performance"},"content":{"rendered":"\n

Introduction<\/strong><\/p>\n\n

Additives play an important and vital role in modifying and improving the properties of various polymers. In this article, the different types of additives that are mostly added to polymer bases as masterbatches are briefly reviewed. By introducing the definition of additives and the importance of their use, this article briefly studies and examines the various functions and benefits that various additives provide in polymer applications. <\/p>\n\n

Keywords: Polymer additives, antioxidant masterbatches, UV stabilizers, flame retardants, lubricants, antistatic agents, fillers, nucleating agents, dyes, impact modifiers, anti-fog additives, lubricating additives, plasticizers.<\/p>\n\n

Introduction<\/h2>\n\n

Polymers are widely used in various industries due to their versatility and tunable properties. However, polymers often require additional modifications to meet the needs of manufacturers and consumers. This means that they cannot be used alone for specific and diverse applications without the presence of various additives. Additives, or in other words, substances incorporated into polymer matrices, can significantly affect the properties and performance of polymers. Some of these additives are added directly to the polymer during processing, while others are added to the base polymer in the form of various masterbatches during polymer processing. Polymer masterbatches are concentrated mixtures of additives dispersed in a polymer base that provide an efficient way to introduce various additives into the polymer during polymer processing. This article provides an overview of the types of additives used in the polymer industry and emphasizes their definition, importance, and diverse applications. <\/p>\n\n

Definition of additives<\/strong><\/h2>\n\n

Additives are substances that are added to polymers in small amounts to modify their properties or improve their processability. These substances can improve the mechanical strength, thermal stability, flame resistance, UV protection, color, and other properties of polymers. A wide range of additives are usually incorporated into polymer matrices using a variety of masterbatches that facilitate uniform dispersion and efficient integration during processing. Also, sometimes some specific additives are added to the polymer base by petrochemical companies during the production of polymer compounds, and the resulting polymer compounds are marketed and sold under specific trade names. <\/p>\n\n

Types of additives<\/h2>\n\n

1. Antioxidants:<\/h3>\n\n

Antioxidants are additives that prevent the oxidation and degradation of polymers and protect them against thermal degradation and oxidation caused by heat, light or other environmental factors, and by their mechanism of action, they prevent the reduction of mechanical properties and shorten the life of polymers (Figure 1). Common antioxidants include: highly sterically hindered phenols, phosphites and thioesters. <\/p>\n\n

\"\"\/
Figure 1: An example of oxidation of a polymer product under exposure to environmental conditions that has caused its color to change. <\/figcaption><\/figure>\n\n

The use of masterbatches containing antioxidants traps and neutralizes free radicals generated by environmental factors in the polymer product, thereby preventing chain reactions that subsequently cause degradation and loss of polymer properties.In general, antioxidants used in the polymer industry are classified into two categories: primary antioxidants and secondary antioxidants. Primary antioxidants:These are compounds that are added to polymers during the process to provide initial protection against oxidation. They react and trap free radicals formed during the initiation of oxidation, preventing their release and further degradation of polymer chains, and halting the polymer degradation process. For example, Irganox\u00ae 1010, Irganox\u00ae 1076, and Irganox\u00ae 1098 are widely used primary antioxidants. Secondary antioxidants:Secondary antioxidants are usually used in combination with primary antioxidants to provide superior protection against oxidation during the use of a polymer product. They prevent further oxidation of the polymer chains by breaking down hydroperoxides, which are intermediates formed during the oxidation process. Examples of common secondary antioxidants include Irgafos\u00ae 168 and Ultranox\u00ae 626. The mechanism of action of these two classes of antioxidants is shown in Figure 2.<\/p>\n\n

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Figure 2: Mechanism of action of antioxidants to prevent oxidation and degradation of polymer chains. <\/figcaption><\/figure>\n\n

2. UV Stabilizers:<\/h3>\n\n

Ultraviolet radiation is produced by the sun. It can also be emitted by artificial sources such as tanning beds and some types of lamps. When sunlight reaches the Earth’s surface, it contains UV-A, UV-B, and small amounts of UV-C radiation. However, the Earth’s atmosphere, particularly the ozone layer, absorbs a significant portion of UV-B and UV-C radiation, protecting the Earth from their harmful effects (Figure 3). <\/p>\n\n

UV stabilizers are additives that protect polymers from the harmful effects of ultraviolet radiation. These additives absorb or reflect UV light and reduce the degradation and discoloration caused by exposure of polymer products to ultraviolet radiation. Common UV absorbers include benzophenones, benzotriazoles, and hindered amines. HALS (Hindered amine light stabilizers) are a common class of UV stabilizers that act as free radical absorbers generated when ultraviolet radiation hits the polymer chain. They trap the resulting free radicals and neutralize their destructive action. By preventing the formation of free radicals, HALS can significantly reduce the degradation of polymers. <\/p>\n\n

They are especially effective on polyolefins and other oxidation-sensitive materials.<\/p>\n\n

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Figure 3: Different types of UV rays emitted from the surface of the Sun; as can be seen in the figure, the greatest penetration to the Earth’s surface is related to UV-A, which can lead to serious problems, including skin damage and destructive effects on many devices used. <\/figcaption><\/figure>\n\n

3. Flame Retardants:<\/h3>\n\n

Flame retardants are additives that reduce the flammability of polymers and improve their fire safety performance. They interfere with the combustion process and inhibit or delay the spread of flame. Common flame retardant additives include halogenated (brominated) flame retardants, phosphorus-based compounds, antimony compounds, and halogen-free alternatives. Flame retardant masterbatches are used in various industries where fire safety is a critical consideration. They are commonly used in the production of electrical and electronic devices, automotive parts, building materials, textiles, and other plastic products that require fire resistance (Figure 4). <\/p>\n\n

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Figure 4: An example of the use of flame retardant additives – the use of this additive is of great importance in the wire and cable industries. <\/figcaption><\/figure>\n\n

4. Lubricants:<\/h3>\n\n

Lubricants are a class of additives that improve the flow properties of polymers during processing by reducing friction. The primary purpose of using lubricant masterbatches is to improve the processing of polymeric materials. They help reduce friction between polymer chains and between the polymer and processing equipment, enabling smoother flow and easier processing during molding, extrusion, or other manufacturing processes. Common lubricants used in masterbatches include fatty acids, fatty acid esters, and metal stearates. The formulation of the lubricant masterbatche and its dosage depend on factors such as the type of polymer, processing conditions, performance characteristics, and end-product application requirements. <\/p>\n\n

5. Antistatic Agents:<\/h3>\n\n

Antistatic agents reduce or eliminate the accumulation of static electricity on the surface of polymers (Figure 5).<\/p>\n\n

These additives increase the conductivity of the surface and minimize the adsorption of dust onto the surface. Common antistatic agents include surfactants, conductive polymers, and metal compounds. The use of antistatic masterbatches has several benefits, including:\u2022 Preventing electrostatic discharge (ESD) damage to sensitive electronic components.\u2022 Reducing the adsorption of dust, lint, and other airborne particles to the surface of the material.\u2022 Increased safety and comfort for users using static-sensitive products.\u2022 Preventing fire hazards from static discharge in flammable environments.\u2022 Improving product aesthetics by reducing static charge buildup and associated visual defects. <\/p>\n\n

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Figure 5: One of the effects of static electricity on polymeric materials. <\/figcaption><\/figure>\n\n

6. Fillers:<\/h3>\n\n

Filler masterbatches, also known as filler compounds, are additives used in the plastics industry to incorporate filler materials into polymer matrices (Figure 6).<\/p>\n\n

Fillers are solid particles such as calcium carbonate, talc, or glass fibers that are added to polymers to modify properties and reduce costs. Filler masterbatches act as carriers for these materials and facilitate their dispersion and uniform distribution in the polymer. Some common features of filler masterbatches are listed below: <\/p>\n\n

\u2022 Cost reduction\u2022 Creation of advanced mechanical properties\u2022 Improved dimensional stability\u2022 Increased heat resistance\u2022 Surface finish\u2022 Electrical and thermal conductivity<\/p>\n\n

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Figure 6: Some applications of filler masterbatches in polypropylene products. <\/figcaption><\/figure>\n\n

7. Nucleating Agents:<\/h3>\n\n

Nucleating agents are additives used in polymer masterbatches to promote and enhance the crystallization process in polymers. By creating nucleation sites, these agents facilitate the formation of smaller and more uniform crystal structures in the polymer matrix. This leads to several advantages in the properties of the resulting polymer. These advantages include increased transparency, increased stiffness, improved dimensional stability, and improved mechanical performance (Figure 7). <\/p>\n\n

There are various types of nucleating agents used in polymer masterbatches, each with its own advantages and suitable for different polymers and applications. Some common nucleating agents include:\u2022 Inorganic nucleating agents: Inorganic nucleating agents, such as talc, silica, and various types of clay, act as heterogeneous nucleation sites for polymer crystallization. These agents provide a high nucleation density and promote the formation of small, dispersed crystals in the polymer matrix. <\/p>\n\n

\u2022 Organic nucleating agents: Organic nucleating agents, such as benzoic acid derivatives, sorbitol, and some organic salts, can effectively enhance the crystallization of polymers. These agents help reduce the activation energy required for crystallization, leading to faster and more controlled crystallization processes. <\/p>\n\n

\u2022 Carbon-based nucleating agents: Carbon-based nucleating agents such as carbon nanotubes, graphene, and carbon black have attracted attention due to their unique properties. They provide excellent nucleation sites and can improve the mechanical, thermal, and electrical properties of polymers. Nucleating agents in polymer masterbatches are used in several industries. For example, in the packaging industry, nucleating agents are used to increase the transparency and rigidity of polymers. In the automotive sector, nucleating agents can improve the mechanical properties and dimensional stability of polymer components, ensuring durability and reliability. <\/p>\n\n

\"\"\/
Figure 7: An example to better understand the effect of increasing the transparency of polymer products when nucleating agents are used. <\/figcaption><\/figure>\n\n

8. Colors:<\/strong><\/h3>\n\n

Color additives add color to polymers and enhance their attractiveness and beauty. This additive is perhaps one of the most widely used additives in the manufacture of various polymer products. These additives can be organic or inorganic pigments, dyes, or color concentrates. Dyes have and continue to have wide applications in product packaging, various consumer goods, and various other industries (Figure 8). <\/p>\n\n

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Figure 8: Types of color masterbatches for use in various industries. <\/figcaption><\/figure>\n\n

9. Impact modifiers:<\/h3>\n\n

Impact modifiers are additives used in polymers to improve toughness and resistance to impact forces. Polymers inherently have properties such as high strength and stiffness, but may be prone to brittleness when subjected to impact or sudden pressure (Figure 9). <\/p>\n\n

Impact modifiers increase the energy absorption capacity of polymers by providing flexibility and toughness, allowing them to withstand impact without breaking. Incorporating impact modifiers into polymers provides several benefits. Among them, it improves the material\u2019s resistance to cracking, cut sensitivity, and impact strength, making it suitable for applications where durability and impact resistance are critical. Impact modifiers can also increase the processability of materials because they can improve polymer melt flow, reduce melt viscosity, and facilitate easier processing during molding or extrusion. There are several types of impact modifiers used in polymers, each offering specific benefits and compatibility with different polymer systems. Some of the commonly used impact modifiers include:\u2022 Elastomers\u2022 Core-shell polymers\u2022 Thermoplastic polyurethanes (TPU)\u2022 Grafted copolymers <\/p>\n\n

The selection of an appropriate impact modifier depends on factors such as the base polymer, processing conditions, intended application, and desired mechanical properties. The concentration of the impact modifier in the polymer matrix can be adjusted to achieve the desired level of toughness and impact resistance. Impact modifiers are used in a wide range of industries, including automotive, construction, consumer goods, and packaging. They are also used in the production of various products such as automotive parts, pipes, films, sheets, and impact-resistant containers. <\/p>\n\n

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Figure 9: Example of polymer brittleness due to sudden impact <\/figcaption><\/figure>\n\n

10. Anti-fog additives:<\/h3>\n\n

Anti-fog additives are a class of materials that are incorporated into polymer formulations to prevent or reduce fogging on the surface of plastic products. Fogging occurs when water vapor condenses on a surface and forms small droplets or a foggy film that impairs visibility. Anti-fog additives work by modifying the surface properties of polymers to minimize or eliminate the formation of water droplets, thereby maintaining the clarity of the polymer product. There are various types of anti-fog additives used in polymers, each with its own mechanism of action. Some common types of anti-fog additives include: <\/p>\n\n

\u2022 Surfactants\u2022 Hydrophilic coatings\u2022 Absorbents\u2022 Polymer blends<\/p>\n\n

Anti-fog additives are used in a variety of industries. Some common applications include food packaging (e.g., clear food containers, films, and trays) to maintain visual appeal and prevent spoilage of the product inside the package, and in automotive applications (e.g., windshields, mirrors) to ensure clear visibility in wet conditions (Figure 10). <\/p>\n\n

\"\"\/<\/figure>\n\n
\"\"\/
Figure 10: Examples of the use of anti-fog additives in the food packaging and automotive industries <\/figcaption><\/figure>\n\n

11. Slip additives:<\/h3>\n\n

Slip additives are a class of additives used in polymers to improve the surface properties of plastic materials.<\/p>\n\n

They reduce friction and increase lubricity, allowing surfaces to slide smoothly over each other. Lubricant additives play an important role in various polymer applications where reduced friction, processability, and improved performance are desired. The main function of lubricant additives is to reduce the coefficient of friction on the surface of polymeric materials. They achieve this by migrating to the polymer surface and creating a lubricating layer that reduces adhesion between the polymer and other surfaces. This improves sliding properties and reduces adhesion and clogging (Figure 11). Different types of lubricant additives used in polymers include:<\/p>\n\n

). <\/p>\n\n

This class of materials is used to improve the processability of polymeric materials, reduce surface friction during manufacturing, increase the release of molded parts from molds, and create a smooth, non-stick surface for final products.<\/p>\n\n

\"\"\/
Figure 11: Mechanism of action of lubricant additives <\/figcaption><\/figure>\n\n
\"\"\/
Figure 12: One of the applications of lubricant additives is in the production of polymer films. <\/figcaption><\/figure>\n\n

12. Plasticizers:<\/h3>\n\n

These materials are a class of additives used in polymers to improve flexibility, processability, and final performance. These materials are added to some polymers with the aim of increasing flexibility, lowering the glass transition temperature, and making them easier to process during processing. <\/p>\n\n

The addition of these materials is associated with a reduction in intermolecular forces within the polymer matrix (Figure 13). This increases molecular mobility, which in turn makes the resulting polymer more capable of plastic deformation under environmental and thermal stresses. In other words, this increased mobility allows the polymer chains to slide past each other more easily, resulting in increased flexibility and reduced stiffness. <\/p>\n\n

The following are the different types of plasticizers used in polymers, each with its own characteristics and applications. Some common plasticizers include:\u2022 Phthalate plasticizers\u2022 Phosphate plasticizers\u2022 Trimellitate plasticizers\u2022 Citrate plasticizers\u2022 Polymer plasticizersThe selection of the appropriate plasticizer depends on several factors such as the type of polymer, desired flexibility, processing conditions, end product requirements, and regulatory considerations. The concentration of plasticizer in the polymer matrix can be adjusted to achieve the desired level of flexibility and end product performance. Plasticizers are used in a variety of industries. They are widely used in the production of flexible PVC products such as vinyl flooring, wire and cable insulation, automotive interiors, and flexible films. They are also used in other polymers such as polyurethanes, elastomers, and coatings to improve flexibility and processability. <\/p>\n\n

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Figure 13: The presence of plasticizers between polymer chains makes them slide better over each other, which increases the flexibility of the polymer. <\/figcaption><\/figure>\n\n

Conclusion<\/h2>\n\n

Various additives available in the polymer industry play a very important role in enhancing the properties and performance of polymers. The various types of additives discussed in this article, including antioxidants, UV stabilizers, flame retardants, lubricants, antistatic agents, slip agents, fillers, nucleating agents, colorants, impact modifiers, anti-fog additives, lubricant additives, and plasticizers, offer a wide range of functions to meet specific application needs. Understanding the capabilities and benefits of these additives allows manufacturers to optimize polymer formulations and develop high-performance materials for various industries. <\/p>\n\n

Compiled by: Zahra Davatgari<\/p>\n\n

Edited by: Dr. Mehrnaz Bahadori<\/p>\n\n

Resources<\/h3>\n\n

\u2022 Gibson and M. Rivin, “Polymer Additives: Uses and Applications.” Wiley, 2001.\u2022 M. Xanthos, “Functional Additives for Polymers: Science and Applications.” Wiley, 2009.\u2022 A. N. Gent and S. H. Ali, “Polymer Additives.” Springer, 1983.\u2022 C. Vasile and A. Ionescu, “Polymer Additives: Chemistry and Applications.” Springer, 2018.\u2022 T. C. Chung, “Polymer Composites with Carbonaceous Nanofillers: Properties and Applications.” CRC Press, 2012.\u2022 M. D. Lechner, “Additives in Polymers: Industrial Analysis and Applications.” Wiley, 2005.\u2022 A. Jenkins, “Plastic Additives Handbook.” Elsevier, 2002. \u2022 S. Ebnesajjad, “Additives for Polyolefins: Getting the Most out of Polypropylene, Polyethylene, and TPO.” Elsevier, 2015.\u2022 S. Thomas and C. P. Reghunadhan Nair, “Rubber Nanocomposites: Preparation, Properties, and Applications.” Wiley, 2017.\u2022 M. Mathew, “Polymer Blends and Composites: Chemistry and Technology.” CRC Press, 2019.\u2022 N. M. Hardey, et al. “Polymer nucleating agents: Recent advances and applications.” Polymer Engineering & Science, 56(4), 339-353 (2016).\u2022 T. P. Nguyen, et al. “Nucleating agents for enhancing crystallization in polymers: Recent advances, challenges, and future prospects.” Journal of Applied Polymer Science, 135(17), 46206 (2018).\u2022 S. Shishoo. “Plastics in Medical Devices: Properties, Requirements, and Applications.” William Andrew, 2010. S. Shishoo. “Plastics in Medical Devices: Properties, Requirements, and Applications.” William Andrew, 2010.\u2022 A. Gandini and E. Silvestre. “From monomers to polymers: Carbon dioxide as a renewable resource.” CRC Press, 2010.\u2022 J. Hicks. “Handbook of Plastics Testing and Failure Analysis.” John Wiley & Sons, 2007.\u2022 K. Friedrich. “Polymer Composites: From Nano- to Macro-Scale.” Springer, 2005.\u2022 C. B. Bucknall. “Toughened Plastics II: Novel Approaches in Science and Engineering.” Elsevier, 1997.\u2022 A. Budrugeac, et al. “Polymers in Packaging Applications.” Polymers, 12(4), 881 (2020). \u2022 L. A. Utracki. “Handbook of Polymer Blends and Composites.” Volumes 1-4. CRC Press, 2003.\u2022 J. C. Salamone (Ed.). “Polymer Additives: Advanced Industrial Analysis.” Wiley, 2005.\u2022 J. P. Bonino, et al. “Review of antimisting agents: Emphasis on aviation applications.” Journal of Applied Polymer Science, 95(6), 1295-1311 (2005).\u2022 M. J. Forrest. “Polymeric Biomaterials: Structure and Function.” CRC Press, 2013.\u2022 M. Patel, et al. “Biodegradable Polymers: Processing, Degradation, and Applications.” CRC Press, 2021.\u2022 D. E. Packham. “Plastics Packaging: Properties, Processing, Applications, and Regulations.” Springer, 2016.\u2022 J. P. Bonino, et al. “Effect of slip additives on the surface behavior of thermoplastics: Role of additive concentration.” Journal of Polymer Science Part B: Polymer Physics, 40(14), 1581-1591 (2002).\u2022 J. G. Pritchard. “Additives for Plastics Handbook.” Elsevier, 2001.\u2022 S. Ebnesajjad. “Surface Treatment of Materials for Adhesion Bonding.” William Andrew, 2005.\u2022 A. L. Andrady. “Plastics and the Environment.” John Wiley & Sons, 2012.\u2022 D. J. Lohse, et al. “Slip and antiblocking agents.” In: G. Wypych (Ed.), Handbook of Antistatics. ChemTec Publishing, 2007.\u2022 C. A. Harper. “Handbook of Plastics, Elastomers, and Composites.” McGraw-Hill, 2002.\u2022 J. Wypych. “Handbook of Plasticizers.” ChemTec Publishing, 2017.\u2022 L. W. McKeen. “The Effect of Sterilization Methods on Plastics and Elastomers.” William Andrew, 2012. <\/p>\n","protected":false},"excerpt":{"rendered":"

Introduction Additives play an important and vital role in modifying and improving the properties of various polymers. 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