Free radical two step synthesis of styrene and acrylate block copolymers with disulphide initiators
Free radical two step synthesis of styrene and acrylate block copolymers with disulphide initiators
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DOI：
10.1002/pi.1995.210360103
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发表时间：
1995
影响因子：
3.2
通讯作者：
M. Opresnik;A. Šebenik
中科院分区：
文献类型：
--
作者：
M. Opresnik;A. Šebenik
在紫外线照射下，苯乙烯、甲基丙烯酸甲酯和丙烯酸乙酯与脂肪族和芳香族二硫化物在本体和THF溶液中进行受控两步嵌段共聚。在聚合的第一步中，反应性最强的体系是丙烯酸乙酯与芳族二硫化物。聚合的分子量和产率随着反应时间的增加而增加。大分子被初级终止。 SR 自由基和通过 NMR 光谱观察到的两种大自由基的组合。仅在 MMA 中检测到了微不足道的未引发光聚合部分。在聚合的第二步中，来自第一步的纯化的大分子引发剂与另外的单体反应，形成具有少量未反应的大分子引发剂的嵌段共聚物。共聚物的分子量增加，嵌段之间的键合片段可通过 1 H NMR 检测到。整个反应是在两个硫基之间插入单体。
Controlled two step block copolymerization of styrene, methyl methacrylate and ethyl acrylate with aliphatic and aromatic disulphides under UV irradiation took place in bulk and in THF solution. In the first step of the polymerization, the most reactive system was ethyl acrylate with aromatic disulphides. The molecular weights and yields of polymerizations increased with reaction time. The macromolecules were terminated by primary. SR radicals and by combination of two macroadicals which was observed by NMR spectroscopy. Aninsignificant portion of uninitiated photopolymerization was detected only for MMA. In the second step of polymerization, the purified macroinitiators from the first step reacted with additional monomers to form block copolymers with a small quantity of unreacted macroinitiator. The molecular weights of copolymers increased, the bonding segments between the blocks being detected by 1H NMR. The overall reaction is an insertion of monomers between two thiyl groups.