Polymers from 1,2‐disubstituted ethylenic monomers, 2. Homopolymers from dialkyl fumarates by radical initiator
Polymers from 1,2‐disubstituted ethylenic monomers, 2. Homopolymers from dialkyl fumarates by radical initiator
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由 1,2-二取代烯基单体形成的聚合物，2. 通过自由基引发剂由富马酸二烷基酯形成均聚物
DOI：
10.1002/marc.1981.030021204
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发表时间：
1981
期刊：
影响因子：
--
通讯作者：
Shigeki Mori
中科院分区：
文献类型：
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作者：
T. Otsu;O. Ito;N. Toyoda;Shigeki Mori
一般认为，单取代和1，1-二取代的乙烯在引发剂存在下均聚，但1，2-二取代的乙烯，除了碳酸亚乙烯酯和马来酰亚胺衍生物，由于取代基的空间位阻，几乎不发生均聚。1975年，Bengough等3）报道了富马酸二乙酯（DEF）在自由基引发剂作用下均聚得到相对较高数均分子量的均聚物（δ = 15000）。几乎与此同时，我们在DEF与乙烯交替共聚合制备头-头聚（丙烯酸乙酯）的实验中也观察到了类似的现象。此外，DEF的顺式异构体马来酸二乙酯也在自由基偶氮引发剂和异构化催化剂如吗啉的存在下均聚。最近我们发现，各种二烷基富马酸酯（RF）可以进行自由基均聚，并且在一些DRF如富马酸二异丙酯中，聚合容易进行以产生高分子量聚合物。本文介绍了各种DRF的自由基均聚和聚合物的表征的结果。
It has been generally accepted that mono and 1, l-disubstituted ethylenes are homopolymerized in the presence of initiators, but the homopolymerizations of 1, 2-disubstituted ethylenes, except vinylene carbonate’) and maleimide derivatives”, occur very hardly, because of the steric hindrance of the substituents. In 1975, Bengough et al. 3) reported that diethyl fumarate (DEF) homopolymerized by radical initiator to give a relatively high number-average molecular weight homopolymer (&= 15000). At almost the same time, a similar observation was made in our laboratory in the alternating copolymerization of DEF with ethylene in order to obtain the head-to-head poly (ethy1 a~ rylate)~). Furthermore diethyl maleate, cis-isomer of DEF, was also homopolymerized in the presence of both radical azo initiator and isomerization catalyst such as morpholine’). Recently we found that various dialkyl fumarates@ RF) could undergo radical homopolymerization, and that in some DRFs such as diisopropyl fumarate the polymerization proceeded easily to yield high molecular weight polymers. The present paper describes the results of radical homopolymerizations of various DRFs and of characterization of the polymers.