{"id":15420,"date":"2025-09-29T12:06:46","date_gmt":"2025-09-29T08:36:46","guid":{"rendered":"https:\/\/behinpolymerco.com\/termal-analizler-dsc-ve-oit\/"},"modified":"2026-06-10T13:48:52","modified_gmt":"2026-06-10T10:18:52","slug":"termal-analizler-dsc-ve-oit","status":"publish","type":"post","link":"https:\/\/behinpolymerco.com\/tr\/termal-analizler-dsc-ve-oit\/","title":{"rendered":"Termal analizler (DSC ve OIT)"},"content":{"rendered":"\n

girii\u015f<\/h2>\n\n

Polimerler s\u0131cakl\u0131k de\u011fi\u015fimlerine kar\u015f\u0131 \u00e7ok hassast\u0131r. Is\u0131t\u0131ld\u0131\u011f\u0131nda baz\u0131lar\u0131 eriyebilir, so\u011futuldu\u011funda ise baz\u0131lar\u0131 ufalanabilir. Plastik \u00fcretiminde optimum s\u0131cakl\u0131\u011f\u0131 bilmek, en g\u00fc\u00e7l\u00fc ve en dayan\u0131kl\u0131 \u00fcr\u00fcnlerin elde edilmesini sa\u011flayabilir. Diferansiyel Tarama Kalorimetrisi (DSC), polimerlerin geni\u015f bir s\u0131cakl\u0131k aral\u0131\u011f\u0131na maruz kald\u0131\u011f\u0131nda g\u00f6sterdi\u011fi performans\u0131 ve bozulmay\u0131 inceleyen ve \u00f6l\u00e7en hassas bir analitik ara\u00e7t\u0131r. Bir numunenin oksijen varl\u0131\u011f\u0131ndaki termal kararl\u0131l\u0131\u011f\u0131 da DSC cihaz\u0131 kullan\u0131larak incelenebilir. Bu \u00e7al\u0131\u015fmada, DSC termal testinin k\u0131sa bir a\u00e7\u0131klamas\u0131 verildikten sonra, Oksidasyon \u0130nd\u00fcksiyon S\u00fcresi\/S\u0131cakl\u0131k (OIT) testi incelenmi\u015ftir. Anahtar kelimeler: Diferansiyel Tarama Kalorimetrisi (DSC) testi, Oksidasyon \u0130nd\u00fcksiyon S\u00fcresi (OIT) testi.<\/p>\n\n

girii\u015f<\/h2>\n\n

Diferansiyel taramal\u0131 kalorimetre (DSC), polimerlerin \u0131s\u0131tmaya verdi\u011fi tepkiyi incelemek i\u00e7in kullan\u0131lan bir y\u00f6ntemdir. DSC testi, kristal yap\u0131l\u0131 bir polimerin erime davran\u0131\u015f\u0131n\u0131 veya cam ge\u00e7i\u015fini ara\u015ft\u0131rmak i\u00e7in kullan\u0131labilir. <\/p>\n\n

DSC d\u00fczene\u011fi bir \u00f6l\u00e7\u00fcm odas\u0131 ve bir bilgisayardan olu\u015fur. Biri incelenen numuneyi i\u00e7eren, di\u011feri referans olarak kullan\u0131lan (ve genellikle bo\u015f olan) iki \u00f6l\u00e7\u00fcm plakas\u0131 DSC cihaz\u0131nda \u0131s\u0131t\u0131l\u0131r. Bilgisayar s\u0131cakl\u0131k de\u011fi\u015fimlerini izler ve DSC plakalar\u0131n\u0131n s\u0131cakl\u0131k de\u011fi\u015fim h\u0131z\u0131n\u0131 ayarlar. <\/p>\n\n

Bir DSC cihaz\u0131n\u0131n iki haznesi aras\u0131nda belirli bir \u0131s\u0131 miktar\u0131 i\u00e7in s\u0131cakl\u0131k de\u011fi\u015fim h\u0131z\u0131 farkl\u0131d\u0131r. Bu fark, haznelerin i\u00e7indeki i\u00e7eri\u011fin bile\u015fimine ve faz de\u011fi\u015fimleri gibi meydana gelen fiziksel de\u011fi\u015fikliklere ba\u011fl\u0131d\u0131r. DSC y\u00f6nteminde, sistem her iki haznenin s\u0131cakl\u0131\u011f\u0131n\u0131 ayn\u0131 tutmak i\u00e7in haznelerden birine verilen \u0131s\u0131y\u0131 de\u011fi\u015ftirir. Son olarak, iki haznenin s\u0131cakl\u0131\u011f\u0131n\u0131 ayn\u0131 tutmak i\u00e7in kullan\u0131lan \u0131s\u0131daki fark rapor edilir ve \u0131s\u0131 fark\u0131n\u0131n (q) s\u0131cakl\u0131\u011fa (T) kar\u015f\u0131 grafi\u011fi \u00e7izilir. \u015eekil 1, bir DSC cihaz\u0131n\u0131n i\u00e7 \u015fematik g\u00f6sterimini g\u00f6stermektedir. <\/p>\n\n

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\u015eekil 1. Bir DSC cihaz\u0131n\u0131n genel \u015femas\u0131<\/figcaption><\/figure>\n\n

DSC diyagram\u0131 kullan\u0131larak elde edilen polimerlerin termal \u00f6zellikleri \u015funlard\u0131r:<\/p>\n\n

1-Is\u0131 kapasitesi (Cp):<\/h3>\n\n

Bir maddenin \u0131s\u0131 kapasitesi, s\u0131cakl\u0131\u011f\u0131n\u0131 1\u00b0C art\u0131rmak i\u00e7in gereken \u0131s\u0131 miktar\u0131d\u0131r. Cp genellikle J\/\u00b0C cinsinden ifade edilir ve \u0131s\u0131 ak\u0131\u015f\u0131n\u0131n \u0131s\u0131tma h\u0131z\u0131na b\u00f6l\u00fcnmesiyle elde edilebilir. Is\u0131 ak\u0131\u015f\u0131, birim zamanda sa\u011flanan \u0131s\u0131 miktar\u0131d\u0131r:\u0130li\u015fki 1: \"\"Denklem 1’de t, zamana e\u015fittir. Ayr\u0131ca, \u0131s\u0131tma h\u0131z\u0131, s\u0131cakl\u0131\u011f\u0131n zamana g\u00f6re de\u011fi\u015fim h\u0131z\u0131na e\u015fittir:Denklem 2: \"\"<\/p>\n\n

Denklem 2’deki T\u2206, s\u0131cakl\u0131k de\u011fi\u015fimine e\u015fde\u011ferdir. Son olarak, \u0131s\u0131 kapasitesi bu iki denklemin b\u00f6l\u00fcnmesiyle elde edilir:Denklem 3: <\/p>\n\n

\"\"\/<\/figure>\n\n

Bir malzemenin Cp de\u011feri belirli bir s\u0131cakl\u0131k aral\u0131\u011f\u0131nda sabit ise, \u015eekil 2’de g\u00f6sterildi\u011fi gibi, \u0131s\u0131tma h\u0131z\u0131 ile s\u0131cakl\u0131k aras\u0131ndaki grafik s\u0131f\u0131r e\u011fimli bir do\u011fru olacakt\u0131r. Bu durumda, \u0131s\u0131tma h\u0131z\u0131 sabit ise, sabit \u00e7izgi ile x ekseni aras\u0131ndaki mesafe \u0131s\u0131 kapasitesine e\u015fit olacakt\u0131r. Aksi takdirde, \u0131s\u0131 kapasitesi \u0131s\u0131tma h\u0131z\u0131 ile s\u0131cakl\u0131k aras\u0131ndaki grafi\u011fin e\u011fiminden elde edilir. <\/p>\n\n

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\u015eekil 2. Is\u0131tma s\u0131ras\u0131nda Cp de\u011feri de\u011fi\u015fmeyen bir malzeme i\u00e7in s\u0131cakl\u0131\u011fa ba\u011fl\u0131 ak\u0131\u015f diyagram\u0131. <\/figcaption><\/figure>\n\n

2-Cam ge\u00e7i\u015fi:<\/h3>\n\n

Bir polimer erimi\u015f halinden so\u011fudu\u011funda, bir noktada cam ge\u00e7i\u015f s\u0131cakl\u0131\u011f\u0131na (Tg) ula\u015f\u0131r. Bu noktada, zincir hareketlili\u011findeki de\u011fi\u015fiklik nedeniyle polimerin mekanik \u00f6zellikleri elastik bir malzemeninkinden k\u0131r\u0131lgan bir malzemeninkine d\u00f6n\u00fc\u015f\u00fcr. \u015eekil (3), cam ge\u00e7i\u015f s\u0131cakl\u0131\u011f\u0131nda s\u0131cakl\u0131\u011f\u0131n bir fonksiyonu olarak \u0131s\u0131 ak\u0131\u015f diyagram\u0131n\u0131 g\u00f6stermektedir. Polimerlerin \u0131s\u0131 kapasitesi, cam ge\u00e7i\u015f s\u0131cakl\u0131\u011f\u0131ndan \u00f6nce ve sonra farkl\u0131d\u0131r. Polimerlerin \u0131s\u0131 kapasitesi (Cp) genellikle Tg’lerinden daha y\u00fcksektir. DSC, polimerlerin Tg’sini belirlemek i\u00e7in de\u011ferli bir y\u00f6ntemdir. Cam ge\u00e7i\u015finin belirli bir s\u0131cakl\u0131kta aniden de\u011fil, bir s\u0131cakl\u0131k aral\u0131\u011f\u0131nda ger\u00e7ekle\u015fti\u011fi dikkate de\u011ferdir. Diyagramdaki e\u011fimli b\u00f6lgenin orta s\u0131cakl\u0131\u011f\u0131 Tg olarak kabul edilir. <\/p>\n\n

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\u015eekil 3. Cam ge\u00e7i\u015f \u015femalar\u0131. Cam ge\u00e7i\u015fi, \u0131s\u0131 kapasitesindeki de\u011fi\u015fim nedeniyle \u0131s\u0131-s\u0131cakl\u0131k diyagram\u0131nda bir b\u00fck\u00fclmeye neden olur (A). Is\u0131 ak\u0131\u015f\u0131-s\u0131cakl\u0131k diyagram\u0131nda, bir s\u0131cakl\u0131k aral\u0131\u011f\u0131nda meydana gelen kademeli bir ge\u00e7i\u015ftir (B). Cam ge\u00e7i\u015f s\u0131cakl\u0131\u011f\u0131, e\u011fimli b\u00f6lgenin ortas\u0131nda kabul edilir. <\/figcaption><\/figure>\n\n

3-Kristalin:<\/h3>\n\n

Cam ge\u00e7i\u015f s\u0131cakl\u0131\u011f\u0131n\u0131n \u00fczerinde, polimer zincirleri olduk\u00e7a hareketlidir. Tg’nin \u00fczerindeki s\u0131cakl\u0131klarda, zincirler d\u00fczenli bir dizilim olu\u015fturmak ve kristalle\u015fmek i\u00e7in yeterli enerjiye sahiptir. Kristalle\u015fme ekzotermik bir s\u00fcre\u00e7tir ve bu nedenle \u00e7evreye \u0131s\u0131 sal\u0131n\u0131r; dolay\u0131s\u0131yla numune ve referans s\u0131cakl\u0131klar\u0131n\u0131 ayn\u0131 tutmak i\u00e7in daha az \u0131s\u0131 gerekir, bu da kaydedilen \u0131s\u0131 ak\u0131\u015f\u0131nda bir azalmaya ve \u015eekil (4)’te g\u00f6sterildi\u011fi gibi ak\u0131\u015f-s\u0131cakl\u0131k grafi\u011finde bir d\u00fc\u015f\u00fc\u015fe neden olur. Kristalle\u015fme zirvesi, numunede kristalle\u015fmenin ger\u00e7ekle\u015fti\u011fini do\u011frulamak i\u00e7in kullan\u0131labilir ve ayr\u0131ca kristalle\u015fme s\u0131cakl\u0131\u011f\u0131n\u0131 (Tc) ve kristalle\u015fme gizli \u0131s\u0131s\u0131n\u0131 belirlemek i\u00e7in de kullan\u0131labilir. Kristalle\u015fme s\u0131cakl\u0131\u011f\u0131, grafikteki en d\u00fc\u015f\u00fck nokta olarak tan\u0131mlan\u0131r. Kristalle\u015fme gizli \u0131s\u0131s\u0131 (entalpi), e\u011fri alt\u0131ndaki alandan hesaplan\u0131r. <\/p>\n\n

\"\"\/
\u015eekil 4. Is\u0131 ak\u0131\u015f\u0131-s\u0131cakl\u0131k grafi\u011finde kristalle\u015fme zirvesine bir \u00f6rnek. Kristalle\u015fme ekzotermik bir s\u00fcre\u00e7tir, bu nedenle sabit bir \u0131s\u0131tma h\u0131z\u0131n\u0131 korumak i\u00e7in numuneye giden \u0131s\u0131 ak\u0131\u015f\u0131 azalt\u0131lmal\u0131d\u0131r. <\/figcaption><\/figure>\n\n

4- Erime:<\/h3>\n\n

Erime s\u0131cakl\u0131\u011f\u0131nda, polimer zincirleri serbest\u00e7e hareket edebilir. Erime endotermik bir s\u00fcre\u00e7tir ve \u0131s\u0131 emilimini gerektirir. S\u00fcrekli \u0131s\u0131tmaya ra\u011fmen, erime s\u00fcreci boyunca s\u0131cakl\u0131k sabit kal\u0131r. Bu s\u00fcre zarf\u0131nda eklenen enerji, kristal b\u00f6lgelerin erimesi i\u00e7in kullan\u0131l\u0131r ve zaten erimi\u015f olan zincirlerin ortalama kinetik enerjisini etkilemez. \u015eekil (5)’te g\u00f6r\u00fclebilece\u011fi gibi, bu, \u0131s\u0131-s\u0131cakl\u0131k diyagram\u0131nda bir s\u0131\u00e7rama ve s\u00fcreksizlik olarak ortaya \u00e7\u0131kar. Erime i\u015flemi s\u0131ras\u0131nda sisteme giren \u0131s\u0131, erime gizli \u0131s\u0131s\u0131d\u0131r ve \u0131s\u0131 ak\u0131\u015f\u0131-s\u0131cakl\u0131k diyagram\u0131ndaki erime tepesinin alt\u0131ndaki alandan hesaplan\u0131r. Erime s\u0131cakl\u0131\u011f\u0131 (Tm), erime tepesinin en y\u00fcksek noktas\u0131ndaki s\u0131cakl\u0131kt\u0131r. Erime i\u015fleminden sonra, s\u0131cakl\u0131k \u0131s\u0131tma ile tekrar artar. Bununla birlikte, erimi\u015f haldeki bir polimerin \u0131s\u0131 kapasitesi, kat\u0131 kristal polimerinkinden daha y\u00fcksektir. Bu, s\u0131cakl\u0131\u011f\u0131n \u00f6ncekinden daha yava\u015f bir oranda artt\u0131\u011f\u0131 anlam\u0131na gelir. <\/p>\n\n

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\u015eekil 5. Is\u0131 ak\u0131\u015f\u0131-s\u0131cakl\u0131k diyagram\u0131nda g\u00f6r\u00fcnen erime zirvesi (A), erime noktas\u0131nda \u0131s\u0131 ak\u0131\u015f\u0131-s\u0131cakl\u0131k diyagram\u0131nda g\u00f6r\u00fcnen s\u0131\u00e7rama (B) <\/figcaption><\/figure>\n\n

\u015eekil (6)’da, cam ge\u00e7i\u015f s\u0131cakl\u0131\u011f\u0131n\u0131, kristalle\u015fme tepesini ve erime tepesini i\u00e7eren DSC diyagram\u0131 g\u00f6sterilmektedir.<\/p>\n\n

\"\"\/
\u015eekil 6. Cam ge\u00e7i\u015fi, kristalle\u015fme ve erime ge\u00e7iren bir polimer i\u00e7in \u0131s\u0131 ak\u0131\u015f\u0131-s\u0131cakl\u0131k diyagram\u0131n\u0131n bir \u00f6rne\u011fi. <\/figcaption><\/figure>\n\n

Is\u0131tma s\u0131ras\u0131nda t\u00fcm polimerlerin \u00fc\u00e7 ge\u00e7i\u015fin tamam\u0131na da u\u011framad\u0131\u011f\u0131n\u0131 belirtmekte fayda var. Kristalle\u015fme ve erime pikleri yaln\u0131zca kristalle\u015febilen polimerlerde g\u00f6zlemlenir. Bunun nedeni, %100 amorf polimerlerin yaln\u0131zca cam ge\u00e7i\u015f pikini g\u00f6stermesidir. Yar\u0131 kristal polimerler genellikle amorf b\u00f6lgeler de i\u00e7erdi\u011finden, onlar da cam ge\u00e7i\u015f pikini g\u00f6sterirler. \u015eekil (7), yar\u0131 kristal bir polimerin ve amorf bir polimerin DSC grafi\u011finin kar\u015f\u0131la\u015ft\u0131rmas\u0131n\u0131 g\u00f6stermektedir. <\/p>\n\n

\"\"\/
\u015eekil 7. Yar\u0131 kristal yap\u0131l\u0131 bir polimerin ve amorf bir polimerin DSC diyagram\u0131. <\/figcaption><\/figure>\n\n

Bahsedilen bilgilere ek olarak, bir DSC cihaz\u0131 kullan\u0131larak, bir malzemenin \u0131s\u0131 alt\u0131nda oksidasyon performans\u0131n\u0131 incelemek i\u00e7in bir oksidasyon ind\u00fcksiyon s\u00fcresi testi ger\u00e7ekle\u015ftirilir:<\/p>\n\n

Oksidasyon ind\u00fcksiyon s\u00fcresi\/oksidasyon ind\u00fcksiyon s\u0131cakl\u0131\u011f\u0131<\/h2>\n\n

Metaller korozyona maruz kal\u0131rken, plastikler korozyona kar\u015f\u0131 diren\u00e7lidir ancak oksijen, \u0131s\u0131 ve \u0131\u015f\u0131k i\u00e7eren ortamlarda bozulurlar. Polimer \u00fcreticileri, polimerlerin oksidasyona kar\u015f\u0131 stabilitesini art\u0131rmak i\u00e7in stabilizat\u00f6rler kullan\u0131rlar. \u00d6rne\u011fin, polietilen 200\u00b0C’de bozunurken, oksijen yoklu\u011funda ve azot atmosferinde 400\u00b0C’de termal olarak bozunur. Termal bozunmaya kar\u015f\u0131 stabiliteyi art\u0131rmak i\u00e7in polimere antioksidanlar eklenir. Polimerik malzemelerin oksidasyona ve \u00e7evresel fakt\u00f6rlere kar\u015f\u0131 diren\u00e7 derecesi, kullan\u0131m alan\u0131na ba\u011fl\u0131d\u0131r. Bir stabilizat\u00f6r\u00fcn etkinli\u011fini de\u011ferlendirmek i\u00e7in basit bir y\u00f6ntem, erimi\u015f polimerik malzemelerin oksidasyon ind\u00fcksiyon s\u00fcresini veya oksidasyon ind\u00fcksiyon s\u0131cakl\u0131\u011f\u0131n\u0131 (OIT*\/OIT) belirlemektir. Bu nedenle, oksidasyon stabilitesi g\u00f6sterdikleri maksimum s\u00fcre ve s\u0131cakl\u0131\u011f\u0131 tahmin etmek \u00f6nemlidir. OIT, standart bir DSC testidir. OIT*\/OIT \u00f6l\u00e7\u00fcm\u00fc, \u00f6zellikle poliolefinlerde stabilizat\u00f6rlerin performans\u0131n\u0131 de\u011ferlendirmek i\u00e7in bir y\u00f6ntem olarak polimer kalite kontrol\u00fcnde dikkate al\u0131n\u0131r. <\/p>\n\n

girii\u015f<\/h2>\n\n

Oksidasyon ind\u00fcksiyon s\u0131cakl\u0131\u011f\u0131 ve s\u00fcresi testi, PE borular\u0131n de\u011ferlendirilmesinde kullan\u0131lan kalitatif testlerden biridir. Bu test, numuneyi h\u0131zla oksitler ve reaksiyonun endotermik mi yoksa ekzotermik mi oldu\u011funu de\u011ferlendirmek i\u00e7in kullan\u0131l\u0131r. OIT testi iki \u015fekilde yap\u0131l\u0131r: oksidasyon ind\u00fcksiyon s\u0131cakl\u0131\u011f\u0131 ve oksidasyon ind\u00fcksiyon s\u00fcresi; her ikisi de a\u015fa\u011f\u0131da k\u0131saca a\u00e7\u0131klanacakt\u0131r. <\/p>\n\n

Oksidasyon ind\u00fcksiyon s\u00fcresi (Dinamik-OIT)<\/h2>\n\n

Bu ba\u011flamda, polimer numunesi (yakla\u015f\u0131k 15 mg) temiz bir al\u00fcminyum kaba yerle\u015ftirilir ve \u00f6l\u00e7\u00fcm, a\u00e7\u0131k numune kab\u0131 ile bo\u015f bir referans kab\u0131n\u0131n kalibre edilmi\u015f bir DSC cihaz\u0131na azot gaz\u0131 alt\u0131nda yerle\u015ftirilmesinden sonra ger\u00e7ekle\u015ftirilir. EN728T standard\u0131na g\u00f6re, t\u00fcm \u00f6l\u00e7\u00fcm ad\u0131mlar\u0131 boyunca azot ve oksijen gaz\u0131 ak\u0131\u015f\u0131 50 ml.min-1 olarak ayarlanmal\u0131d\u0131r. Numune ve referans, OIT de\u011ferinin belirlendi\u011fi s\u0131cakl\u0131\u011fa kadar en az 20 K\/min h\u0131zla \u0131s\u0131t\u0131l\u0131r. Gerekli s\u0131cakl\u0131\u011fa ilk ula\u015f\u0131ld\u0131\u011f\u0131nda, 3 dakika boyunca izotermal bir ad\u0131ma al\u0131n\u0131rlar. Bu noktaya (t1) ula\u015f\u0131ld\u0131ktan sonra, atmosfer oksijene de\u011fi\u015ftirilir ve DSC f\u0131r\u0131n\u0131, ekzotermik bir sinyal (oksidasyon) tespit edilene kadar ayn\u0131 s\u0131cakl\u0131kta tutulur. Bu oksidasyon sinyalinin ba\u015flang\u0131c\u0131, t2 zaman\u0131yla ili\u015fkilidir (t1 ve t2 de\u011ferleri \u015eekil 8’de g\u00f6sterilmi\u015ftir). Bununla birlikte, sinyal genellikle \u015fekilde g\u00f6sterilenden daha d\u00fc\u015f\u00fck olarak tespit edilir, bu nedenle ba\u015flang\u0131\u00e7 \u200b\u200bs\u0131cakl\u0131\u011f\u0131n\u0131 belirlemek kolay de\u011fildir. Bu durumda, t2’yi de\u011ferlendirmek zordur \u00e7\u00fcnk\u00fc t2 zaman\u0131nda temel \u00e7izgiden bir sapma vard\u0131r. \u0130zotermal faz i\u00e7in do\u011fru \u00f6l\u00e7\u00fcm s\u0131cakl\u0131\u011f\u0131n\u0131 bulmak, OIT \u00f6l\u00e7\u00fcmlerinde genellikle zordur; s\u0131cakl\u0131k \u00e7ok d\u00fc\u015f\u00fckse, \u00f6l\u00e7\u00fcm s\u00fcresi \u00f6nemli \u00f6l\u00e7\u00fcde artar. \u00d6te yandan, s\u0131cakl\u0131k \u00e7ok y\u00fcksekse, oksijenin verilmesinden hemen sonra oksidasyon meydana gelir ve t2 s\u0131cakl\u0131\u011f\u0131 belirlenemez. Poliolefinler i\u00e7in bu testte, genellikle 30 ila 60 dakika aras\u0131nda bir zaman aral\u0131\u011f\u0131 ve 200 ila 210 \u00b0C aras\u0131nda bir s\u0131cakl\u0131k \u00f6nerilir. <\/p>\n\n

\"\"\/
\u015eekil 8. ISO 11357-6 (2002) standard\u0131na g\u00f6re OIT testi. <\/figcaption><\/figure>\n\n

Oksidasyon \u0130nd\u00fcksiyon S\u0131cakl\u0131\u011f\u0131 (Statik-OIT*)<\/h2>\n\n

*OIT, termogramda oksidasyonun (ba\u015flang\u0131\u00e7) ba\u015flad\u0131\u011f\u0131 noktad\u0131r. *OIT genellikle testteki ba\u015flang\u0131\u00e7 \u200b\u200bzaman\u0131 t2 olarak ifade edilir. \u015eekil 9’da g\u00f6sterildi\u011fi gibi, bu durumda numune oksijen gaz\u0131 (veya hava) varl\u0131\u011f\u0131nda s\u00fcrekli olarak (110\u00b0C\/dak) \u0131s\u0131t\u0131l\u0131r. Bu y\u00f6ntemde, belirli bir zamanda gaz\u0131n de\u011fi\u015ftirilmesi gerekli de\u011fildir. \u0130lgili noktalar\u0131 kar\u015f\u0131la\u015ft\u0131rd\u0131\u011f\u0131m\u0131zda, OIT* y\u00f6nteminin daha az ayarlama gerektirdi\u011fi ve daha iyi bir ba\u015flang\u0131\u00e7 \u200b\u200bnoktas\u0131 sa\u011flad\u0131\u011f\u0131 a\u00e7\u0131kt\u0131r.<\/p>\n\n

\"\"\/
\u015eekil 9. OIT testi* <\/figcaption><\/figure>\n\n

\u00c7\u00f6z\u00fcm:<\/h2>\n\n

Diferansiyel taramal\u0131 kalorimetre (DSC), malzemelerin fiziksel ve kimyasal yap\u0131s\u0131n\u0131 belirlemek i\u00e7in g\u00fc\u00e7l\u00fc bir y\u00f6ntemdir ve termal analiz olarak kabul edilir. Diferansiyel taramal\u0131 kalorimetre, enerji de\u011fi\u015fimlerini niceliksel olarak \u00f6l\u00e7mek i\u00e7in kullan\u0131l\u0131r. Bu y\u00f6ntem, erime s\u0131cakl\u0131\u011f\u0131, erime gizli \u0131s\u0131s\u0131, cam ge\u00e7i\u015f s\u0131cakl\u0131\u011f\u0131 ve kristalle\u015fme s\u0131cakl\u0131\u011f\u0131n\u0131 \u00f6l\u00e7mek i\u00e7in kullan\u0131labilir. Ayr\u0131ca, yukar\u0131dakiler g\u00f6z \u00f6n\u00fcne al\u0131nd\u0131\u011f\u0131nda, OIT termal kararl\u0131l\u0131k testinin, y\u00fcksek s\u0131cakl\u0131klara maruz kald\u0131\u011f\u0131nda polimer malzemelerin ve par\u00e7alar\u0131n performans\u0131n\u0131 belirlemede \u00f6nemli bir fakt\u00f6r oldu\u011fu sonucuna var\u0131labilir. Bu test, ham maddeleri incelemek ve ayr\u0131ca nihai \u00fcr\u00fcn\u00fcn kalitesini incelemek i\u00e7in kullan\u0131l\u0131r. Ham maddelerin OIT de\u011feri d\u00fc\u015f\u00fckse, d\u00fc\u015f\u00fck termal direnci g\u00f6sterir ve malzemeler i\u015flenemez; veya malzemelerin kararl\u0131l\u0131\u011f\u0131n\u0131 kaybedip i\u015fleme s\u0131ras\u0131nda tahrip olma olas\u0131l\u0131\u011f\u0131 vard\u0131r. <\/p>\n\n

Derleyenler: Marzieh Shams Harandi, Samin Saleki<\/p>\n\n

Kaynaklar<\/h3>\n\n

1. Berlin H. Investigation of Polymers with Differential Scanning Calorimetry. Adv. Lab DSC Investig. Polym. 2009:1-7.2. https:\/\/www.innovatechlabs.com\/newsroom\/2267\/what-a-dsc-analysis-of-a-polymer-can-discover\/ 3.Schmid M, Ritter A, Affolter S. Determination of oxidation induction time and temperature by DSC: results of round robin tests. Journal of Thermal Analysis and Calorimetry. 2006, 9;83(2):367-71.<\/p>\n","protected":false},"excerpt":{"rendered":"

girii\u015f Polimerler s\u0131cakl\u0131k de\u011fi\u015fimlerine kar\u015f\u0131 \u00e7ok hassast\u0131r. Is\u0131t\u0131ld\u0131\u011f\u0131nda baz\u0131lar\u0131 eriyebilir, so\u011futuldu\u011funda ise baz\u0131lar\u0131 ufalanabilir. Plastik \u00fcretiminde optimum s\u0131cakl\u0131\u011f\u0131 bilmek, en<\/p>\n","protected":false},"author":1,"featured_media":14894,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"_jetpack_memberships_contains_paid_content":false,"footnotes":""},"categories":[282],"tags":[],"class_list":["post-15420","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-makaleler"],"acf":[],"yoast_head":"\nTermal analizler (DSC ve OIT) - \u0628\u0647\u06cc\u0646 \u067e\u0631\u062f\u0627\u0632\u0627\u0646-behinpolimer<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/behinpolymerco.com\/tr\/termal-analizler-dsc-ve-oit\/\" \/>\n<meta property=\"og:locale\" content=\"tr_TR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Termal analizler (DSC ve OIT)\" \/>\n<meta property=\"og:description\" content=\"girii\u015f Polimerler s\u0131cakl\u0131k de\u011fi\u015fimlerine kar\u015f\u0131 \u00e7ok hassast\u0131r. 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