取向聚四氟乙烯接技丙烯酸共聚物的形态结构和性能研究

EFFECT OF THE GRAFTING OF ACRYLIC ACID ON STRUCTURE AND PROPERTIES OF ORIENTED POLYTETR AFLUOROETHYLENE

用光学显微镜、电子显微镜、Ｘ射线衍射等方法对不同拉伸度聚四氟乙烯（ＰＴＦＥ），和对其γ辐射接技丙烯酸（ＡＡ）接枝共聚物的结构进行了研究。．结果表明，未接枝取向的ＰＴＦＥ，在γ射线辐照下产生大小不等的空穴，接枝丙烯酸填充在这些空穴中，形成粒状分散相微区结构，接枝量增大形成接枝链束，而使双折射增加。并对接枝共聚物结构和性能关系进行了讨论。

Structures and propertics of the gamma-radiation induced graftcoplymerization of acrylic acid (AA) to oriented polytetrafluoroethylene (PTFE)were investigated with electron-optical microscope and X-ray djffraction. When AAis grafted onto oriented PTFE the birefringence (An) is found to be greater thanthat of the initial oriented specimen. It haS been suggested that the grafting takesplace in the submicro voids formed during the cold drawing of the PTFE. For agrafted AA content exceeding 75% violation of the chain orientation in the PTFEtakes place owing to filling in all the submicro voids with the grafted polymer,affecting the dependence of An on the amount of the grafted AA. The structures andproperties of absorbent water of the grafted copolymer was also discussed.