کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
7832117 1503288 2007 4 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Influence of Non-isothermal Melt Crystallization on the Thermal Behavior and Morphology of Poly-L-lactide
موضوعات مرتبط
مهندسی و علوم پایه شیمی شیمی تئوریک و عملی
پیش نمایش صفحه اول مقاله
Influence of Non-isothermal Melt Crystallization on the Thermal Behavior and Morphology of Poly-L-lactide
چکیده انگلیسی
The influence of non-isothermal melt crystallization on thermal behavior and morphology of poly-L-lactide (PLLA) was investigated by differential scanning calorimetry (DSC), polarizing micrograph (POM), and scanning electron microscopy (SEM). Crystallization performed at lower cooling rate (2 °C·min−1) was accompanied by a change of the kinetics around 118 °C. The glass transition temperature of PLLA decreased with the increase in cooling rate. The crystallinity at the end of crystallization and the size of PLLA spherulites increased with decrease in cooling rate, and PLLA became almost amorphous when cooled at a rapid rate of 10 °C·min−1. PLLA biodegradable material with a spherulite structure was obtained by using a compression mould and controlling the cooling rates, and spherulites developed rapidly at lower cooling rates. The fracture surfaces of PLLA at low cooling rates were more compact and smoother, but more brittle, than those at high cooling rates.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Acta Physico-Chimica Sinica - Volume 23, Issue 5, May 2007, Pages 647-650
نویسندگان
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