辐照接枝氟塑料的正电子寿命谱研究

Study of irradiation induced grafting of fluoride polymer by positron lifetime spectra

用正电子湮没寿命谱研究了对聚四氟乙烯和聚全氟乙丙烯进行γ辐照接枝的反应机理。结果表明；γ辐照和辐照接枝便聚合物的凝聚态结构发生了变化。随着辐照剂量的增加，接技率不断提高，而正电子湮没长寿命产生明显改变，说明了辐照接枝主要发生在非晶区以及非晶区和晶区的交界处。将实验结果与红外光谱进行了比较。

The reaction mechanism of irradiation induced grafting co-polymerization offluoride polymer is investigated by positron annihilation lifetAne technique. Theresults indicated that γ-irradiation induced grafting changed the structure ofcondensed state of polymer. With increasing irradiation dose, graft rate raised andthe long lifetime of positron annihilation changed significantly. It show thatirradiation- grafted reaction is mainly localized in non- crystflllite as well as interfacebetween non-crystallite and crystallite.