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首页> 外文期刊>Journal of Applied Polymer Science >Synthesis and thermal characterization of macromonomeric azo initiator containing poly(epsilon-caprolactone): Styrene and methyl methacrylate copolymerization
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Synthesis and thermal characterization of macromonomeric azo initiator containing poly(epsilon-caprolactone): Styrene and methyl methacrylate copolymerization

机译：含聚ε-己内酯的大分子偶氮引发剂的合成与热表征：苯乙烯与甲基丙烯酸甲酯的共聚

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Macromonomeric azo initiator containing biodegradable poly(epsilon-caprolactone, (PCL) was synthesized by the condensation reaction of PCL with 4,4'-azobis(4-cyanopentanoyl chloride) and methacryloyl chloride. This macromonomeric azo initiator (MIM-PCL) was further used in the polymerization of styrene (St) or methylmethacrylate (MMA) via a radical initiated process at 60 degrees C in bulk in order to obtain polystyrene (PS)-b-PCL or poly(methyl methacrylate) (PMMA)-b-PCL crosslinked block copolymers. Thermal decomposition kinetics of MIM-PCL and its copolymers were studied by using thermogravimetric analysis and differential scanning calorimetry (DSC). DSC traces of MIM-PCL showed two different exotherms, at 98 and 127 degrees C, The first exotherm, observed at 98 degrees C, was due to the polymerization of the terminal methacrylic groups; the other was due to the exothermic decomposition of azo groups of MIM-PCL. PCL-b-PS and PCL-b-PMMA crosslinked block copolymers showed single glass transition temperatures due to the compatibility of the crosslinked block segments. The polymer-solvent interaction parameter of PCL in chloroform was determined by vapor pressure osmometry to be 0.1 for the PCL-chloroform system at 30 degrees C. The average molecular weights between junction points of crosslinked homo PCL were calculated by using the Flory-Rehner equation. (C) 1998 John Wiley & Sons, Inc. [References: 33]
机译：通过PCL与4,4'-偶氮双（4-氰基戊二酰氯）和甲基丙烯酰氯的缩合反应合成了含有可生物降解的聚己内酯（PCL）的大单体偶氮引发剂，进一步将该大单体偶氮引发剂（MIM-PCL）合成通过自由基引发工艺在60℃下本体聚合用于苯乙烯（St）或甲基丙烯酸甲酯（MMA）的聚合反应，以获得聚苯乙烯（PS）-b-PCL或聚（甲基丙烯酸甲酯）（PMMA）-b-PCL通过热重分析和差示扫描量热法（DSC）研究了MIM-PCL及其共聚物的热分解动力学。MIM-PCL的DSC示踪表明在98和127摄氏度时有两个不同的放热曲线，第一个放热曲线为在98℃下观察到，这是由于末端甲基丙烯酸基团的聚合;另一种是由于MIM-PCL偶氮基的放热分解，PCL-b-PS和PCL-b-PMMA交联的嵌段共聚物显示出单玻璃由于交联的嵌段的相容性，其转变温度较高。在30℃下，通过蒸气压渗透法测定PCL-氯仿体系中PCL在氯仿中的聚合物-溶剂相互作用参数为0.1。使用Flory-Rehner方程计算交联均聚PCL的结合点之间的平均分子量。 。 （C）1998 John Wiley＆Sons，Inc. [参考：33]

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