【摘要】 对不同防老D含量的γ-辐照交联聚乙烯的连续和间歇化学应力松弛研究表明,氧化断链系沿主链无规进行,过程主要可分为氧化诱导和氧化裂解两个阶段。活化能为30kcal/mol,与防老D含量、辐照剂量无关。间歇应力松弛试验发现,断裂链的交联分数β随松弛温度升高和防老D含量增加而增大。更多还原

【Abstract】 The contionuous and intermittent chemical stress relaxations of γ-irra-diated cross-linked low density polyethylene containing different amount ofantioxidant D were studied. It was discovered that the cleavage occursrandomly along the network chains. The relaxation may be divided mainlyinto the oxidation induction and oxidation breaking stages. The activationenergy of chemical stress relaxation was found to be 30 Kcal/mole, whichis independent of D content and radiation dose. By intermittent relaxation,it was shown that the β-value, the fraction of chains being reformed afterscission is increasing with the increase of relaxation temperature and Dcontent.更多还原