Synthesis, surface properties, and morphologies of poly[methyl(3,3,3- trifluoropropyl)siloxane]-b-polystyrene-b-poly(tert-butyl acrylate) triblock copolymers by a combination of anionic ROP and ATRP

Abstract

A series of well-defined poly[methyl(3,3,3-trifluoropropyl)siloxane]-b- polystyrene-b-poly(tert-butyl acrylate) (PMTFPS-b-PS-b-PtBA) triblock copolymers were prepared by a combination of anionic ring-opening polymerization of 1,3,5-trimethyl-1,3,5-tris(3′,3′,3′-trifluoropropyl) cyclotrisiloxane (F 3), and atom transfer radical polymerization (ATRP) of styrene (St) and tert-butyl acrylate (tBA), using the obtained α-bromoisobutyryl-terminal PMTFPS (PMTFPS-Br) as the macroinitiators. The ATRP of St from PMTFPS-Br, as well as the ATRP of tBA from the obtained PMTFPS-b-PS-Br macroinitiators, has typical characteristic of controlled/living polymerization. The results of contact angle measurements for the films of PMTFPS-b-PS-b-PtBA triblock copolymers demonstrate that the compositions have an effect on the wetting behavior of the copolymer films. For the copolymer films with different compositions, there may be different macroscale or nanoscale structures on the outmost layer of the copolymer surfaces. The films with high content of PtBA blocks exhibit almost no ordered microstructures on the outmost layer of the copolymer surfaces, even though they have microphase-separated structures in bulk. © 2012 Wiley Periodicals, Inc.