四氟乙烯共聚物熔体中的转变四氟乙烯-全氟烷基乙烯基醚共聚物

应用科学学报 ›› 1983, Vol. 1 ›› Issue (1): 49-54.

四氟乙烯共聚物熔体中的转变四氟乙烯-全氟烷基乙烯基醚共聚物

潘道成¹, 夏根林¹, 孙秀英¹, 史观一², 乐俊士², 傅克洪², 王丽华²

1. 上海有机氟材料研究所;
2. 中国科学院上海有机化学研究所

收稿日期:1982-02-02 出版日期:1983-03-31 发布日期:1983-03-31

TRANSITION IN THE MELT OF TETRAFLUOROETHYLENE-PERFLUOROALKYL VINYL ETHER COPOLYMER

PAN DAOCHENG¹, XIA GENGLIN¹, SUN XIUYIN¹, SHI GUANYI², YUE JUNSHI², FU KEHONG², WANG LIHUA²

1. Shanghai Instiute of Organic Fluoro-materiaT;
2. Shanghai Institute of Organic Chemistry, Academia Sinica

Received:1982-02-02 Online:1983-03-31 Published:1983-03-31

摘要/Abstract

摘要： 用扭辫分析(TBA)发现在四氟乙烯-全氟烷基乙烯基醚共聚物(PFA)熔体中存在转变T_uPFA从熔点以上T_u以下温度冷却结晶时形成无规晶片,从T_u以上温度冷却时形成球晶;而从转变温度范围冷却时,则形成棒晶或棒晶与其他晶型共存的形态.DSC研究表明,从T_u以下温度冷却结晶时,其速度要比从T_u以上温度冷却时为快,但转变时并无明显的热效应产生.根据上述结果,对PFA熔体中发生的转变性质提出了解释.我们认为,这种转变与分子链从伸展构象转变为卷曲构象有关.

Abstract: A physical transition T_u in the melt of tetraftuoroethylene-perfluoroalkyl vinyl ether copolymer (PFA) can be detected by torsional braid analysis technique. The crystalline morphologies of the melt-crystallized PFA. also show a significant dependence on the melt temperature round about the transition temperature T_u. When PFA is cooled and crystallized from a temperature in the range of T_u to Tm, the randomly arranged lamella will be obtained, when it is cooled from a temperature above T_u, the spherulitic morphology will be formed; and when it is cooled from a temperature within the transition temperature range T_u, the rodlike morphology will be obtained. The isothermal crystallization rate, measured by DSG, also has a distinct change above and below T_u. But differential scanning calorimetry measurement does not show an endothermic peak occurring at transition temperature interval, so the transition is attributed to the change of chain configuration with the increase of temperature.

潘道成, 夏根林, 孙秀英, 史观一, 乐俊士, 傅克洪, 王丽华. 四氟乙烯共聚物熔体中的转变四氟乙烯-全氟烷基乙烯基醚共聚物[J]. 应用科学学报, 1983, 1(1): 49-54.

PAN DAOCHENG, XIA GENGLIN, SUN XIUYIN, SHI GUANYI, YUE JUNSHI, FU KEHONG, WANG LIHUA. TRANSITION IN THE MELT OF TETRAFLUOROETHYLENE-PERFLUOROALKYL VINYL ETHER COPOLYMER[J]. Journal of Applied Sciences, 1983, 1(1): 49-54.