用正电子湮没寿命谱学法研究聚四氟乙烯改性和结晶度关系

A STUDY ON THE RELATIONSHIP BETWEEN THE CHANGE OF PERFORMANCE AND CRYSTALLINITY OFPOLYTETRAF

该文首次提出用ｅ￣＋湮没寿命谱学参数计算ＰＴＦＥ的结晶度：研究了退火、￣（６０）Ｃｏ的低剂量照射对结晶度影响的机理；揭示出次长成份是ｅ￣＋、Ｏ－Ｐｓ捕获态的过渡态，在该态中不存在Ｐ－Ｐｓ的捕获湮没。

In this paper, the positron annihilation lifetime spectroscopy parameters areused to calculate the crystallinity of PTFE for the first time.The mechanisms ofinfluence of annealing and a low dose of ￣(60)Co-irradiation on the crystallinity arestudied.Itis brought to light that the secondary long composition of the positronannihilation lifetime spectrum is the transition state to the captured positron e￣+or positronium O-P.In this state there exists no positronium p-ps captured or annihilated.