Block copolymers by transformation of “living” carbocationic into “living” radical polymerization. II. ABA-type block copolymers comprising rubbery polyisobutene middle segment

✍ Scribed by Simion Coca; Krzysztof Matyjaszewski

• Publisher: John Wiley and Sons
• Year: 1997
• Tongue: English
• Weight: 206 KB
• Volume: 35
• Category: Article
• ISSN: 0887-624X
• DOI: 10.1002/(sici)1099-0518(19971130)35:16<3595::aid-pola27>3.0.co;2-9

✦ Synopsis

A general method for the transformation of ''living'' carbocationic into ''living'' radical polymerization, without any modification of chain ends, is reported for the preparation of ABA block copolymers. For example, a,v-difunctional polyisobutene, capped with several units of styrene, Cl-St-PIB-St-Cl, prepared cationically ( M n Å 7800, M w /M n Å 1.31) was used as an efficient difunctional macroinitiator for homogeneous ''living'' atom transfer radical polymerization to prepare triblock copolymers with styrene, PSt-PIB-PSt (M n Å 28,800, M w /M n Å 1.14), methyl acrylate, PMA-PIB-PMA (M n Å 31,810, M w /M n Å 1.42), isobornyl acrylate, PIBA-PIB-PIBA ( M n Å 33,500, M w /M n Å 1.21), and methyl methacrylate, PMMA-PIB-PMMA ( M n Å 33,500, M w /M n Å 1.47).