以1,8-萘二甲酸二甲酯为共聚单体,与2,6-萘二甲酸二甲酯和乙二醇进行共聚,得到U形1,8-萘结构单元含量分别为2％和5％(质量分数)的聚萘二甲酸乙二醇酯共聚物.DSC测试表明,与聚2,6-萘二甲酸乙二醇酯(PEN)相比,含有1,8-萘结构单元共聚物的Tg和Tm略有降低,而1,8-萘U形结构单元的引入可以增加PEN的热结晶速率.采用Avrami模型得到了PEN及共聚物的Avrami指数n、结晶速率常数K以及半结晶时间t1/2.PEN、含2％1,8-萘结构单元共聚物和含5％1,8-萘结构单元共聚物的半结晶时间t1/2分别为2.62 min、2.09 min和1.24min,表明U形1,8-萘结构单元的引入确实可以增加聚合物的结晶速率.
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