Exceptional copolymerizability of o-phthalaldehyde in cationic copolymerization with vinyl monomers†,Polymer Chemistry

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Exceptional copolymerizability of o-phthalaldehyde in cationic copolymerization with vinyl monomers†
Polymer Chemistry ( IF 4.1 ) Pub Date : 2019-06-05 00:00:00 , DOI: 10.1039/c9py00547a
Keisuke Hayashi _{1,

2,

3,

4,

5} , Arihiro Kanazawa _{1,

2,

3,

4,

5} , Sadahito Aoshima _{1,

2,

3,

4,

5}

Affiliation

The characteristic cationic copolymerization behavior of o-phthalaldehyde (OPA) was demonstrated to allow the controlled copolymerization with an alkyl vinyl ether (VE), the alternating copolymerization, and the copolymerization with sterically hindered nonhomopolymerizable monomers such as β,β-dimethyl VE and 1,1-diphenylethylene. We first investigated the copolymerization of OPA with isobutyl VE using various initiating systems. Under the optimized conditions, the copolymerization proceeded in a living manner via the selective cyclization of two aldehydes of OPA and frequent crossover propagation reactions, and the polymerization yielded copolymers with controlled molecular weights and narrow molecular weight distributions. Moreover, β,β-dimethyl VE and 1,1-diphenylethylene, which are vinyl monomers that neither homopolymerize nor copolymerize with benzaldehyde derivatives, were successfully copolymerized with OPA to yield linear copolymers. The unique reactivity of the cyclic propagating species derived from OPA is most likely responsible for its exceptional copolymerizability.

中文翻译：

邻苯二甲醛在与乙烯基单体的阳离子共聚中具有出色的共聚性†

已证明邻苯二甲醛（OPA）的阳离子共聚行为可以控制与烷基乙烯基醚（VE）的共聚，交替共聚，以及与位阻非均聚单体（如β，β-二甲基VE和1）的共聚。，1-二苯基乙烯。我们首先使用各种引发系统研究了OPA与异丁基VE的共聚。在最佳条件下，共聚反应通过OPA的两种醛的选择性环化和频繁的交叉传播反应，以及聚合反应产生的共聚物具有可控的分子量和窄的分子量分布。而且，β，β-二甲基VE和1，1-二苯基乙烯是既不与苯甲醛衍生物均聚也不与之共聚的乙烯基单体，则与OPA成功地共聚以产生线性共聚物。衍生自OPA的环状繁殖物种的独特反应性极有可能是其出色的可共聚性的原因。

更新日期：2019-06-05

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