Title

Poly(tert-butyl acrylate-b-isobutylene-b-styrene) Terpolymer From a Carbocationic Initiator Containing a Latent Radical Initiating Site

Document Type

Article

Publication Date

3-8-2006

Department

Polymers and High Performance Materials

Abstract

A poly(isobutylene-b-styrene) (PIB-PS) copolymer was synthesized via quasi-living carbocationic polymerization from an initiator containing a latent site for atom transfer radical polymerization (ATRP) initiation. The initiator, 3.3,5-trimethyl-5-chlorohexyl acetate (TMCHA), was synthesized in four steps from methyl 3,3-dimethyl-4-pentenoate. The PIB block was created at -70 degrees C in a methylcyclohexane/methyl chloride (60:40) cosolvent system, using TiCl4 as the catalyst, followed by sequential addition of styrene. The acetate head group of the resulting block copolymer was converted to a hydroxyl group using a strong base and subsequently esterified with 2-bromopropionyl bromide to create an initiating site for ATRP of tert-butyl acrylate, which was carried out using a Cu(I)Br/1,1,4,7,7,-pentamethyl-diethylenetriamine (PMDETA) catalyst system. The final terpolymers had compositions that were very close to theoretical. (c) 2006 Elsevier Ltd. All rights reserved.

Publication Title

Polymer

Volume

47

Issue

6

First Page

1852

Last Page

1860