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首页> 外文期刊>Journal of Applied Polymer Science >The Synthesis of PHA-g-(PTHF-b-PMMA) Multiblock/Graft Copolymers by Combination of Cationic and Radical Polymerization
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The Synthesis of PHA-g-(PTHF-b-PMMA) Multiblock/Graft Copolymers by Combination of Cationic and Radical Polymerization

机译：阳离子聚合与自由基聚合相结合合成PHA-g-（PTHF-b-PMMA）多嵌段/接枝共聚物

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摘要

A new and promising method for the diversification of microbial polyesters based on chemical modifications is introduced. Poly(3-hydroxy alkanoate)-g-(poly(tetra hydrofuran)-b-poly(methylmethacrylate)) (PHA-g-(PTHF-b-PMMA)) multigraft copolymers were synthesized by the combination of cationic and free radical polymerization. PHA-g-PTHF graft copolymer was obtained by the cationic polymerization of THF initiated by the carbonium cations generated from the chlorinated PHAs, poly(3-hydroxybutyrate-co-3-hydroxyvalerate) (PHBV), and poly(3-hydroxybutyrate-co-3-hydroxyhexanoate) (PHBHx) in the presence of AgSbF6. Therefore, PHA-g-PTHF graft copolymers with hydroxyl ends were produced. In the presence of Ce+4 salt, these hydroxyl ends of the graft copolymer can initiate the redox polymerization of MMA to obtain PHA-g-(PTHF-b-PMMA) multi-graft copolymer. Polymers obtained were purified by fractional precipitation. In this manner, their gamma-values (volume ratio of nonsolvent to the solvent) were also determined. Their molecular weights were determined by GPC technique. The structures were elucidated using H-1-NMR and FTIR spectroscopy. Thermal analyses of the products were carried out using differential scanning calorimeter (DSC) and thermogravimetric analysis (TGA). (C) 2008 Wiley Periodicals, Inc. J Appl Polym Sci 111: 2308-2317, 2009
机译：介绍了一种基于化学修饰的微生物聚酯多样化的新方法。阳离子和自由基聚合相结合，合成了聚（3-羟基链烷酸酯）-g-（聚（四氢呋喃）-b-聚甲基丙烯酸甲酯）（PHA-g-（PTHF-b-PMMA））多接枝共聚物。通过由氯化PHAs，聚（3-羟基丁酸酯-co-3-羟基戊酸酯）（PHBV）和聚（3-羟基丁酸酯-co）生成的碳鎓阳离子引发的THF阳离子聚合反应制得PHA-g-PTHF接枝共聚物在AgSbF6存在下（-3-羟基己酸酯）（PHBHx）。因此，制备了具有羟基端基的PHA-g-PTHF接枝共聚物。在Ce + 4盐的存在下，接枝共聚物的这些羟基末端可以引发MMA的氧化还原聚合，从而获得PHA-g-（PTHF-b-PMMA）多接枝共聚物。所得聚合物通过分步沉淀纯化。以这种方式，还确定了它们的伽马值（非溶剂与溶剂的体积比）。它们的分子量通过GPC技术测定。使用H-1-NMR和FTIR光谱对结构进行了阐明。使用差示扫描量热仪（DSC）和热重分析（TGA）对产品进行热分析。 （C）2008 Wiley Periodicals，Inc. J Appl Polym Sci 111：2308-2317，2009

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