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Synthesis and characterization of Pst‐ b ‐PDMS‐ b ‐PSt copolymers by atom transfer radical polymerization
Author(s) -
Peng Hui,
Cheng Shiyuan,
Fan Zhiqiang
Publication year - 2004
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.20368
Subject(s) - polymer chemistry , copolymer , atom transfer radical polymerization , polystyrene , styrene , materials science , polymerization , radical polymerization , reversible addition−fragmentation chain transfer polymerization , end group , telechelic polymer , polymer , composite material
Polystyrene‐ b ‐poly(dimethylsiloxane)‐ b ‐polystyrene (Pst‐ b ‐PDMS‐ b ‐PSt) triblock copolymers were synthesized by atom transfer radical polymerization (ATRP). Commercially available difunctional PDMS containing vinylsilyl terminal species was reacted with hydrogen bromide, resulting in the PDMS macroinitiators for the ATRP of styrene (St). The latter procedure was carried out at 130°C in a phenyl ether solution with CuCl and 4, 4′‐di (5‐nonyl)‐2,2′‐bipyridine (dNbpy) as the catalyzing system. By using this technique, triblock copolymers consisting of a PDMS center block and polystyrene terminal blocks were synthesized. The polymerization was controllable; ATRP of St from those macroinitiators showed linear increases in M n with conversion. The block copolymers were characterized with IR and 1 H‐NMR. The effects of molecular weight of macroinitiators, macroinitiator concentration, catalyst concentration, and temperature on the polymerization were also investigated. Thermodynamic data and activation parameters for the ATRP are reported. © 2004 Wiley Periodicals, Inc. J Appl Polym Sci 92: 3764–3770, 2004