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OALib Journal期刊
ISSN: 2333-9721
费用：99美元
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结晶/无定形PMMA-b-PHBV-b-PMMA三嵌段共聚物的合成及热稳定性表征
DOI: 10.3724/SP.J.1105.2014.13147, PP. 40-48
Keywords: 结晶/无定形,PHBV,PMMA,三嵌段共聚物,热降解动力学,ATRP
Abstract:
以生物质聚酯聚（3-羟基丁酸酯-co-3-羟基戊酸酯）（PHBV）为结晶组分、聚甲基丙烯酸甲酯（PMMA）为无定形组分，通过原子转移自由基聚合法（ATRP）制备了ABA型结晶/无定形三嵌段共聚物.采用凝胶色谱法（GPC）、傅里叶红外光谱（FTIR）和核磁共振氢谱（1H-NMR）表征了三嵌段共聚物的分子量及其分子量分布和化学结构；使用热失重分析仪（TG）测试了三嵌段共聚物的热稳定性，并通过Horowitz-Metzger法计算了嵌段共聚物的降解表观活化能.研究表明，三嵌段共聚物的最大转化产率为92.39%；当单体与大分子引发剂的比例为81时，三嵌段共聚物的T0、T5%、Tmax温度分别提高25K、15K和40K，三嵌段共聚物降解表观活化能Ea可由纯PHBV的428.25kJ·mol-1降低至169.83kJ·mol-1.
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