Modification of styrene polymer with organosilicon groups

✍ Scribed by M. G. Assadi; M. Mahkam; Z. Tajrezaiy

• Publisher: John Wiley and Sons
• Year: 2007
• Tongue: English
• Weight: 249 KB
• Volume: 18
• Category: Article
• ISSN: 1042-7163
• DOI: 10.1002/hc.20314

✦ Synopsis

Abstract

The homopolymer of 4‐chloromethylstyrene (P1) and its copolymers with styrene (in various mole ratios) were synthesized by bulk and solution free radical polymerizations, respectively, at 70 ± 1°C using α,α′‐azobis(isobutyronitrile) as an initiator. Lithiation of these soluble polymers in THF at −78°C was done and reacted with electrophiles such as tert‐BuMe~2~Si, Et~3~Si, and Me~3~SiCH~2~ in the presence of 4,4′‐di‐tert‐butylbiphenyl (DTBB) as a catalyst to produce modified polystyrene. In the other way, trimethylsilylmethyl lithium substitute as a nucleophile was covalently linked to the homopolymer and copolymer. The polymers were characterized by IR, ^1^H NMR, ^13^C NMR, differential scanning calorimetry (DSC), and gel permeation chromatography. DSC showed that incorporation of silyl substitute in the side chains of homopolymer and copolymers increases the rigidity of the polymers and, subsequently, their glass transition temperature. © 2007 Wiley Periodicals, Inc. Heteroatom Chem 18:414–420, 2007; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/hc.20314