| 投料比对丙氨酸直接熔融聚合法改性聚乳酸的影响 |
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| 引用本文： | 侯晓娜,汪朝阳,叶瑞荣,毛郑州.投料比对丙氨酸直接熔融聚合法改性聚乳酸的影响[J].材料导报,2009,23(12). |
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| 作者姓名： | 侯晓娜 汪朝阳 叶瑞荣 毛郑州 |
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| 作者单位： | 华南师范大学化学与环境学院化学系,广州,510008 |
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| 基金项目： | 广东省自然学基金博士启动项目，国家自然科学基金 |
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| 摘 要： | 以L-丙氨酸(L-Ala)为单体,与外消旋乳酸(D,L-LA)直接熔融聚合,合成氨基酸改性的聚乳酸类生物降解材料,并用特性粘数、FTIR、1H NMR、GPC、DSC、XRD等手段进行了表征.随着投料比中丙氨酸含量n(Ala)的增加,改性聚乳酸在氯仿、四氢呋喃等有机溶剂中的溶解性逐渐由易溶变为难溶,但在DMSO中的溶解性却很好;DSC、XRD等测试显示,聚合物由一定的结晶性逐渐转变为无定形态;可溶性共聚物聚(乳酸一丙氨酸)P(LA-co-Ala)]的特性粘数逐步减小,重均相对分子质量(Mw)逐渐减小,分散度(Mw/Mn)有变窄的趋势.
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| 关 键 词： | 丙氨酸 改性聚乳酸 直接熔融聚合 投料比 生物降解材料 |
Influences of Feed Ratio on the Biodegradable Material Polylactic Acid Modified by L-alanine via Direct Melt Copolymerization |
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| HOU Xiaona,WANG Zhaoyang,YE Ruirong,MAO Zhengzhou.Influences of Feed Ratio on the Biodegradable Material Polylactic Acid Modified by L-alanine via Direct Melt Copolymerization[J].Materials Review,2009,23(12). |
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| Authors: | HOU Xiaona WANG Zhaoyang YE Ruirong MAO Zhengzhou |
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| Affiliation: | HOU Xiaona,WANG Zhaoyang,YE Ruirong,MAO Zhengzhou(Department of Chemistry,School of Chemistry , Environment,South China Normal University,Guangzhou 510006) |
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| Abstract: | Using lactic acid(LA)and alanine(Ala)as monomers,biodegradable material polylactic acid modified by amino acid is synthesized via direct melt copolycondensation.The copolymers are characterized by intrinsic viscosity,FTIR,1H NMR,GPC,DSC and XRD.The results show that,the more the feed molar ratio of Ala,the worse the solubility in chloroform and tetrahydrofuran(THF),but the modified polylactic acid is very easily soluble in DMSO.And the results of DSC and XRD show that the crystallinity of copolymer graduall... |
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| Keywords: | L-alanine modified polylactic acid direct melt polycondensation feed molar ratio biodegradable material |
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