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OALib Journal期刊
ISSN: 2333-9721
费用：99美元
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双噁唑啉对聚碳酸1,2-环己二酯的扩链研究
DOI: 10.3724/SP.J.1105.2011.10253, PP. 772-777
Keywords: 二氧化碳-氧化环己烯共聚物,2,2'-双-(2-噁唑啉),马来酸酐,封端,扩链
Abstract:
采用马来酸酐封端聚碳酸1,2-环己二酯(PCHC),使其末端羟基转变为端羧基(MA-PCHC),并以2,2'-双-(2-噁唑啉)(BOZ)为扩链剂进行扩链反应.研究发现,BOZ与MA-PCHC中的羧基等摩尔情况下,扩链效果最佳.扩链后的PCHC的数均分子量从扩链前的5.6×104增长到12.4×104.扩链后的PCHC热稳定性能得到了明显的提高,起始热分解温度(Td-5%)由260℃提高到317℃,玻璃化转变温度(Tg)由114℃提高到133℃,而且在凝胶含量没有明显变化的情况下熔体黏度提高了30倍.封端扩链后的PCHC的拉伸强度从普通PCHC的35.81MPa增加至40.22MPa,断裂伸长率从4.59%增加至6.22%,而且封端扩链后的PCHC甚至出现了一定的应力屈服的现象.
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