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PEG-PLA嵌段共聚物的合成及13C NMR对平均链段长度的测定
SYNTHESIS OF PEG-PLA BLOCK COPOLYMERS AND DETERMINATION OF AVERAGE BLOCK LENGTHS BY 13C NMR
【摘要】 本文报道聚乙二醇(PEG)在辛酸亚锡存在下与丙交酯(LA)反应合成PEG-PLA嵌段共聚物,用13C NMR测定了共聚物的结构,估算了平均链段长度.实验结果表明,LPEG在反应过程中保持不变,而LPLA随反应时间和LA在原料配比中含量的增加而增加,呈逐步聚合反应特点.对聚合反应机理作了推测.
【Abstract】 PEG-PLA block copolymers were synthesized using polyethylene glycol (PEG) and lac-tide (LA) in the presence of low toxic stannous octoate. The copolymer structure was determined by 13C NMR and the average block leng this were calculated. The results showed that LPKG was unchanged during the reaction process, but LPLA depended on polymerization time and LA content in the feed. This is in agreement with the character of step polymerization. The mechanism of polymerization was also assumed from experimental results.
【关键词】 聚乙二醇-丙交酯嵌段共聚物;
平均链段长度;
核磁共振碳谱;
【Key words】 PEG-PLA Block Copolymer; Average Segment Length; 13C NMR;
【Key words】 PEG-PLA Block Copolymer; Average Segment Length; 13C NMR;
- 【文献出处】 高分子学报 ,Acta Polymerica Sinica , 编辑部邮箱 ,1988年04期
- 【被引频次】38
- 【下载频次】716