论文部分内容阅读
本工作利用裂解气相色谱测定了一系列不用氯碳比以及具有相同氯碳比而氯化条件不同的固相法氯化聚乙烯弹性体的特征裂解产物的相对收率,根据分子轨道能量的差异并对照聚氯乙烯的特征裂解产物分析了氯化聚乙烯特征裂解产物的分子结构来源,进而研究了氯化聚乙烯分子链上氯分布情况。实验结果表明,与悬浮氯化、溶液氯化法一样,在弹性体的氯含量范围内,聚乙烯的固相氯化形成E(—CH_2—CH_2—)、V(—CH_2—CHCl—)、D(—CHCl—CHCl—)型的无规共聚物,无—CCl_2—基团生成.在整个氯化过程中,随着氯含量的增加,D、V 结构均增加,但 D 结构的增加趋势远小于 V 结构的增加趋势,并且直至氯含量超过50%,D 结构的浓度仍相当低(仅为5.0%)。当在聚乙烯熔点以下氯化至氯含量为24%左右,然后再升温至聚乙烯熔点以上氯化时,这样制得的氯化聚乙烯氯分布较为均匀。
This work uses pyrolysis gas chromatography to determine the relative yield of a series of characteristic pyrolysis products of chlorinated polyethylene elastomers without chlorinated carbon and different chlorinated conditions with the same chlorinated carbon and different chlorinated conditions. According to the differences in molecular orbital energies, The molecular structure of chlorinated polyethylene was analyzed based on the characteristic pyrolysis products of PVC, and the distribution of chlorine in the molecular chain of chlorinated polyethylene was also studied. The experimental results showed that the solid chlorides of polyethylene formed E (-CH_2-CH_2 -), V (-CH_2-CHCl-) in the range of chlorine content in the elastomer as in the suspension chlorination and solution chlorination methods. D (-CHCl-CHCl) -type random copolymers without -CCl_2- group.In the whole chlorination process, with the increase of chlorine content, the structure of D, V increased, but the structure of D increased Far less than the increasing trend of the V structure, and until the chlorine content exceeds 50%, the concentration of the D structure is still relatively low (only 5.0%). When the polyethylene melting point below the chlorination of chlorine content of about 24%, and then warmed to the melting point of polyethylene above chlorination, so prepared chlorinated polyethylene chloride distribution is more uniform.