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由ESR方法观察到等规聚丙烯(PP)γ辐射诱发自由基向多烯自由基的转化时间?6天,而6.8％APP和7.6％EPP(APP、EPP分别表示含十六烷、十六烯-1的PP)的转化时间>10天。本实验还观察到这两种添加剂均抑制PP的辐射交联,其中十六烯-1的效果更为显著,测得PP、6.8％APP、4.0％EPP和7.6％EPP的起始凝胶剂量分别为12.6、20.7、30.5和>108 Mrad。本文认为,十六烯-1的烯丙位氢原子易于失去,因而较十六烷更大程度地降低聚丙烯自由基产额和辐射交联。然而,对添加剂影响自由基转化的机制还需进一步研究。
The conversion time of free radical to polyene radical induced by gamma irradiation of isotactic polypropylene (PP) was observed by ESR method for 6 days, while 6.8% APP and 7.6% EPP (APP, EPP respectively indicate cetane, Ene-1 PP)> 10 days. The experiment also observed that both additives inhibited the radiation cross-linking of PP, with the effect of hexadecene-1 being more pronounced. The initial gel dosage of PP, 6.8% APP, 4.0% EPP and 7.6% EPP was measured Respectively 12.6, 20.7, 30.5 and> 108 Mrad. This paper argues that alkene hydrogen atoms of hexadecene-1 tend to be lost and therefore reduce the yield of free-radical polypropylene and radiation crosslinking to a greater extent than hexadecane. However, the mechanism by which additives affect the conversion of free radicals needs further study.