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聚醚在空气氧化或在H_2O_2存在下的光氧化条件下,很容易被氧化成过氧化氢物。控制适度的氧化时间和过氧化氢物浓度,可避免发生链的断裂。聚醚过氧化氢物与亚铁盐或N,N-二甲基对甲苯胺作用,可在较低温度下引发烯类单体接枝共聚,并可避免均聚反应。接枝率随过氧化氢物浓度的增加而增加,随反应时间延长而提高,改变N,N-二甲基对甲苯胺的浓度,接枝率也随之改变。共聚产物分离提纯后,经IR光谱测定和元素分析,均证实了产物为一接枝共聚物。聚醚的氧化及接枝共聚的实验,为聚醚氨酯的氧化和接枝共聚的机理的研究,提供了基本数据。
Polyethers are easily oxidized to hydrogen peroxide under air oxidation or under photooxidation in the presence of H 2 O 2. Control of moderate oxidation time and hydrogen peroxide concentration, to avoid the occurrence of chain fracture. Polyether hydroperoxide and ferrous salts or N, N-dimethyl-p-toluidine role in the lower temperature can lead to vinyl monomer graft copolymerization, and can avoid homopolymerization reaction. The grafting rate increases with the concentration of hydrogen peroxide, increases with the reaction time, changes the concentration of N, N-dimethyl-p-toluidine, the grafting rate also changes. After the copolymer was isolated and purified, the product was confirmed to be a graft copolymer by IR and elemental analysis. The experiment of oxidation and graft copolymerization of polyether provided the basic data for the study of the mechanism of polyether urethane oxidation and graft copolymerization.