【摘要】 对60Coγ射线辐照聚乙烯醇(PVA)的红外谱图(IR)作了分析,即辐照剂量对PVA的交联、裂解度的影响.分析结果表明,当辐照强度达1.68×105Gy时,缔合羟基比例增大,PVA有较高的交联度、结晶度;当辐照强度达2.8×105Gy时,PVA又以裂解为主,双键比例明显增加,此时PVA的有序性与无序性均增大,二者竞争的结果是PVA的结晶度略有减少.自辐照开始后,PVA采取全同立构形式排列的趋势增大。更多还原

【Abstract】 The results indicated that when the radiation dose is 1.68×105Gy,PVA main chain was aggregated and the hydroxyl groups in PVA was increased,which is one of the reasons that caused the degrees of crosslinking and degree of crystallinity.When the radiation dose is 2.8×105Gy,PVA main chain disaggregation accompanied with increasing of the proportion of double bonds.At this time the tendency of regular rearrangement and irregular rearrangement of PVA main chain all increased.The degree of crystallinity showed a slight reduction,compared with the last step.This change ascribed to the competitive result of the rearrangement.The tendency of head-tail in PVA was increased更多还原