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OALib Journal期刊
ISSN: 2333-9721
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聚2,5-呋喃二甲酸乙二醇酯的合成与表征
DOI: 10.3724/SP.J.1105.2012.12095, PP. 24-29
Keywords: 2,5-呋喃二甲酸,聚2,5-呋喃二甲酸乙二醇酯,直接酯化法,合成与表征
Abstract:
以2,5-呋喃二甲酸和乙二醇为原料,草酸亚锡为催化剂,通过直接酯化法合成了线性高分子量聚2,5-呋喃二甲酸乙二醇酯(PEF).运用红外光谱(FTIR)和核磁共振氢谱(1H-NMR)表征了该聚酯的结构;由乌氏黏度计法和凝胶渗透色谱(GPC)建立了该聚酯在一种混合溶剂体系中特性黏数和重均分子量的关系［η］=2.82×10-6Mw0.99dL/g,25℃,苯酚-四氯乙烷(1∶1,W/W);示差扫描量热法(DSC)和热失重分析(TGA)测定了该聚酯的热转变性能,结果表明该聚酯玻璃化转变温度为84℃,熔点为211℃,起始热分解温度高于370℃,具有良好的热稳定性;运用旋转流变仪研究了PEF的流变性能,结果表明,PEF熔体属于假塑性流体,随相对分子量的减小和温度升高,其非牛顿指数增大,在高于PEF熔点20~40℃,剪切速率为2.17×10-2~1.14×102s-1时,PEF的非牛顿指数为0.85左右.
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