کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
5191635 | 1381236 | 2005 | 9 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Improvement of heat stability of poly(l-lactic acid) by radiation-induced crosslinking
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
شیمی
شیمی آلی
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چکیده انگلیسی
Poly(l-lactic acid) (PLLA) has poor heat stability above its glass transition temperature (Tgâ¼60 °C). To improve its softing above Tg, PLLA was mixed with small amount of crosslinking agents and irradiated with various irradiation doses to introduce crosslinking between polymer chains. The most effective agent for radiation crosslinking was triallyl isocyanurate (TAIC). For melt-quenched PLLA, it was found that the most optimal conditions to introduce crosslinking were around 3% of TAIC and the irradiation dose of 50 kGy. The typically crosslinked PLLA showed very low crystallinity because of wide formation of molecular chain network that inhibited molecular motion for crystallization. Notable heat stability above Tg was given by annealing of PLLA samples. Enzymatic degradation of PLLA was retarded with introduction of crosslinks.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Polymer - Volume 46, Issue 13, 17 June 2005, Pages 4695-4703
Journal: Polymer - Volume 46, Issue 13, 17 June 2005, Pages 4695-4703
نویسندگان
Hiroshi Mitomo, Ayako Kaneda, Tran Minh Quynh, Naotsugu Nagasawa, Fumio Yoshii,