Miktoarm Star Copolymers from the Chemical Stitching of Associating Block Copolymers
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- 作者：Hongjing Dou ; Liangzhi Hong ; Guojun Liu
- 刊名：Macromolecules
- 出版年：2010
- 出版时间：May 25, 2010
- 年：2010
- 卷：43
- 期：10
- 页码：4629-4637
- 全文大小：938K
- 年卷期：v.43,no.10(May 25, 2010)
- ISSN：1520-5835
文摘
A new method for the synthesis of miktoarm star copolymers is proposed. To demonstrate its viability, diblock copolymers, PA-b-PSCOOH, with a carboxyl-bearing short PSCOOH block, and triblock copolymers, PB-b-PNH2-b-PB, with an amino-bearing short PNH2 block, were synthesized and characterized. Here PA and PB denote poly(tert-butyl acrylate) and poly(methyl methacrylate), respectively. The carboxyl- and amino-bearing blocks of the copolymers associated with one another due to carboxylate and ammonium ion pairing in dichloromethane. The addition of a coupling agent caused the amino and carboxyl groups to amidize and resulted in the fusion of the associating chains, thus producing miktoarm copolymers μ-(PA)1(PB)2 and μ-(PA)2(PB)2. Factors affecting the relative and total yields of μ-(PA)1(PB)2 and μ-(PA)2(PB)2 formation were investigated.