激光光散射法研究全氟乙丙烯共聚物的形态结构——Ⅰ.形态结构的表征

小角激光光散射技术用于研究FEP共聚物的形态结构,其结果表明:影响共聚物结晶形态的主要因素是共聚组成比和结晶条件。试样在空气中自然冷却条件下结晶,若六氟丙烯含量从2％增加到14—19％,共聚物结晶形态从棒状结晶变为球晶结构。试样在极慢速率(0.2℃/分)冷却条件下易生成棒晶。除上述结构外,某些试样在特定条件下结晶,生成两维和三维球晶共存以及更精细的多重结构。

STUDIES ON THE MORPHOLOGY OF SOME FEP COPOLYMERS BY SMALL ANGLE LIGHT SCATTERING TECHNIQUE——I. CHAEACTEEIZATION OF SUPEEMOLECULAB STEUCTUEE

The crystalline morphology of some FEP copolymers, prepared with different polymerization methods, with different hexafluoropropylene (F6) contents was studied by SALS technique.The results obtained show that the main factors which affect the crystalline morphology of the eopolymers are the content of F6, and the conditions for crystallization. The morphological structure of these copolymers could change from rod-like to spherulitical, as the F6 content changed from 2% to (14-19)% under usual air cooling condition. However, rod-like crystalline structure would form under very low rate of cooling (0.2℃/min.). Some Hv patterns show that some fine structure also exists in addition to the two- and three-dimensional spherulites co-existing in the specimens prepared under certain crystallization conditions.