Preparation and Characterization of Poly(L-lactic acid)/Polybutadiene Block Copolymers |
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| Authors: | Mingli Jiao Kai Yang Wei Pan Wangxi Zhang Si Xie |
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| Institution: | 1. School of Materials and Chemical Engineering , Zhongyuan University of Technology , Zhengzhou, China;2. School of Fashion , Zhongyuan University of Technology , Zhengzhou, China;3. College of Material Science and Engineering , Donghua University , Shanghai, People's Republic of China |
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| Abstract: | A two-step process to prepare poly(L-lactic acid) (PLLA)/polybutadiene (PB) block copolymers was studied. Melt polymerization was used to prepare poly(L-lactic acid) terminated with hydroxy groups, at the same time hydroxy-terminated polybutadiene and 1,6-hexamethylene diisocyanate were employed to synthesize isocyanate-terminated polybutadiene (ITPB). Then PLLA and ITPB were reacted with different PB/PLLA weight ratios. Consequently, a series of PLLA/PB copolymers with linear or crosslinked chains was obtained. Viscosity of the linear copolymer was measured by an Ubbelohde viscometer. Swelling characteristics and crosslink density of the crosslink copolymer were investigated. Fourier transform infrared and proton nuclear magnetic resonance were used to characterize the structure of the copolymer, and dynamic mechanical analysis (DMA) was applied to characterize its thermal properties. Mechanical property measurements showed that a toughened PLLA polymer was synthesized. Atomic force microscope was utilized to characterize its micro-morphology. |
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| Keywords: | crosslinking 1 6-hexamethylene diisocyanate microphase separation poly(L-lactic acid) polybutadiene thermal property |
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