Radiation-induced crosslinking and post-processing of poly(l-lactic acid) composite

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• 作者：Naotsugu Nagasawa ; Noboru Kasai ; Toshiaki Yagi ; Fumio Yoshii ; Masao Tamada
• 关键词：Poly(lactic acid) ; Radiation crosslinking ; Composite ; Triallyl isocyanurate ; Heat resistance ; Optical materials
• 刊名：Radiation Physics and Chemistry
• 出版年：2011
• 出版时间：February 2011
• 年：2011
• 卷：80
• 期：2
• 页码：145-148
• 全文大小：302 K

文摘

Poly(l-lactic acid), PLLA, was irradiated using electron beams (EBs) in the presence of triallyl isocyanurate (TAIC) at 5 % concentration as crosslinking agent. The crosslinked PLLA obtained has heat resistance, as demonstrated by retention of its original shape at glass transition temperature or even higher than 200 °C. As an application of this fact, crosslinked PLLA is applied in spectacle lens to prevent shape deformation of eyeglass frames in displaying and transporting. However, in this application to lens, it is not enough to improve the thermal deformation of PLLA under stress at 70 °C. Radiation-induced crosslinking of a PLLA/silicon dioxide (SiO₂) composite with TAIC and post-processing of the crosslinked PLLA composite by heating were further investigated from the viewpoint of thermal deformation. The PLLA materials have several advantages such as high heat resistance and transparency. It is therefore proved that the combination of radiation-induced crosslinking, composition of SiO₂ and post-heating is beneficial for expanding the applications of PLLA.