Improvement of heat stability of poly(l-lactic acid) by radiation-induced crosslinking |
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Authors: | Hiroshi Mitomo Ayako Kaneda Naotsugu Nagasawa |
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Affiliation: | a Department of Biological and Chemical Engineering, Faculty of Engineering, Gunma University, Tenjin-cho 1-5-1, Kiryu, Gunma 376-8515, Japan b Takasaki Radiation Chemistry Research Establishment, Japan Atomic Energy Research Institute, Watanuki-machi, Takasaki, Gunma 370-1292, Japan |
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Abstract: | Poly(l-lactic acid) (PLLA) has poor heat stability above its glass transition temperature (Tg∼60 °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. |
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Keywords: | Poly( smallcaps" >l-lactic acid) Radiation-induced crosslinking Thermomechanical analysis |
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