辐射接枝聚四氟乙烯的形态结构与结晶性质

<正> 辐射接枝是高聚物改性的重要方法,它特别适用于一般的化学方法难以实现改性的高聚物,如聚四氟乙烯(PTFE)利用辐射接枝改进粘附性取得较好的效益。 不久以前,Yamakowa等人曾对辐射接枝聚乙烯的结构作了讨论。本文用光学显微镜和X-射线等方法对PTFE辐射接枝苯乙烯(St)-丙烯酸(AA)接枝共聚物的超分子

SUPERMOLECULAR STRUCTURES AND CRYSTALLIZATION BEHAVIORS OF POLYTETRAFLUOROETHYLENE BY RADIATION-INDUCED GRAFTING

S'Upermolecular Structures and crystallization behaviors of the gamma-radiation induced graft Copolymerization of styrene (St)-acrylic acid (AA) to polytetrafluoroethy-lene were investigated with electron-optical microscope and X-ray diffration.It was shown that the morphology of crystals obtained changes regularly with increasing graft dose.Four kinds of typical structure morphology (they belong to the linear structure.Graft network, ladder type network, cross-linked network) were observed from graft co-polymer layer. It is demonstrated that the grafted chain aligned perpendicular to the surface films. The results obtained from X-ray diffraction showed that the change of structure occurres; The crystallinity of macromolecular decreases;the size of crystal becomes smaller.