CAJ | 학술논문

采用熔融缩聚法,以1,4-丁二醇、聚乙二醇-200和丁二酸为共缩聚单体,制备了聚乳酸基聚合物--L-乳酸-1,4-丁二醇-丁二酸共缩聚物和L-乳酸-聚乙二醇-丁二酸共缩聚物.PLLA链中引入柔性链的链段长度和柔性链比例是影响共缩聚物相对分子质量的关键因素.在相同缩聚条件下,L-乳酸-1,4-丁二醇-丁二酸共缩聚物相对分子质量比聚乳酸相对分子质量高,而且,随共缩聚单体的用量变化,其相对分子质量有一最大值.L-乳酸-聚乙二醇-丁二酸共缩聚物,由于在PLLA链中引入了较长的柔性链段,其相对分子质量并未大幅提高,甚至降低,且奇怪的是,共缩聚物PLADS-2、PLAD8-3和PLADS-4的GPC曲线呈现双峰.
채용용융축취법,이1,4-정이순、취을이순-200화정이산위공축취단체,제비료취유산기취합물--L-유산-1,4-정이순-정이산공축취물화L-유산-취을이순-정이산공축취물.PLLA련중인입유성련적련단장도화유성련비례시영향공축취물상대분자질량적관건인소.재상동축취조건하,L-유산-1,4-정이순-정이산공축취물상대분자질량비취유산상대분자질량고,이차,수공축취단체적용량변화,기상대분자질량유일최대치.L-유산-취을이순-정이산공축취물,유우재PLLA련중인입료교장적유성련단,기상대분자질량병미대폭제고,심지강저,차기괴적시,공축취물PLADS-2、PLAD8-3화PLADS-4적GPC곡선정현쌍봉.
Poly ( L-lactic acid-co-1,4-butane diol-co-succinic acid) and poly ( L-lacticacid-co-poly ( ethylene glycol)-co-succinic acid) were prepared by melt polycondensation. The flexible segment length and the pxoportion of flexible segment in the PLLA chain were critical parameters influencing the M_n of poly(lactic acid)-based polymers. The Mn of Poly(L-lactic acid-co-1,4-butane diol-co-succinic acid), prepared at the same polymerization conditions as PLLA, was higher than that of PLLA and went up to a maximum value with the change of 1,4-butane diol content, whereas the M_n of poly(L-lactic acid-co-poly(ethylene glycol)-co-succinic acid) only increased a little, or even decreased. Moreover, it was interesting the GPC curves of PLADS-2, PLADS-3 and PLADS-4 exhibited two peaks.