Determination of Thermal Behavior of Leathers in Different Processes by Differential Scanning Calorimetry and Evaluation of the Analysis Conditions

Abstract

The study examined the thermal behavior of leathers in different processes by differential scanning calorimetry (DSC) under the various analysis conditions and the representativeness of hydrothermal stability of leathers by DSC method were investigated. For this purpose, hydrothermal stability of the raw skin, pickled, tanned and finished leathers was firstly analyzed with standard shrinkage temperature test. Then, same leather samples were analyzed in dry and wet states under the different conditioning parameters by DSC method. The obtained data showed that the leather samples analyzed between 25-150 oC, in aqueous media, conditioned for 24 h and within the anti-pressure cells provided the best results. Moreover, the data derived from DSC thermograms under the cited conditions were also parallel with the shrinkage temperature (Ts) values of leathers obtained by standard method. 

Keywords

• Leather,thermal analysis,DSC,thermogram,shrinkage temperature

Farklı Proses Aşamasındaki Derilerin Diferansiyel Taramalı Kalorimetre ile Termal Davranışlarının Belirlenmesi ve Analiz Koşullarının Değerlendirilmesi

Abstract

Çalışmada farklı proses aşamasındaki derilerin termal davranışları çeşitli koşullar altında diferansiyel taramalı kalorimetre (DSC) ile incelenmiş ve derilerin hidrotermal stabilitesinin DSC ile tespit edilebilirliği araştırılmıştır. Bu amaçla öncelikle ham deri, pikle, tabaklanmış ve mamul haldeki derilerin hidrotermal stabilitesi, büzülme sıcaklığı standart testi ile analiz edilerek belirlenmiştir. Ardından aynı deri örnekleri farklı koşullandırma parametreleri kullanılarak kuru ve yaş formda DSC metodu ile analiz edilmiştir. Elde edilen veriler; 24 saat koşullandırılmış ve basınca dayanıklı kaplar içerisinde, sulu ortamda, 25-150 oC aralığında analiz edilen deri örneklerinin en iyi sonuçları verdiğini göstermiştir. Aynı zamanda mevcut koşullardaki DSC termogramlarından elde edilen verilerin, derilerin standart metot ile elde edilen büzülme sıcaklığı (Ts) değerleri ile paralellik gösterdiği tespit edilmiştir. 

Keywords

• Deri,termal analiz,DSC,termogram,büzülme sıcaklığı

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