Synthesis and characterization of new polymer systems containing very bulky tris(trimethylsilyl)methyl substituents as side chains |
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Authors: | Kazem D Safa Mirzaagha Babazadeh Mehrdad Mahkam |
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Institution: | a Faculty of Chemistry, Tabriz University, 51664 Tabriz, Iran b Faculty of Science, Azarbaijan University of Tarbiat Moallem, 53714-161 Tabriz, Iran |
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Abstract: | The 4-chloromethyl styrene (CMS) was copolymerized with different styrenic monomers such as methyl styrene, 4-methoxy styrene and α-methyl styrene by free radical polymerization method at 70 ± 1 °C using α,α′-azobis(isobutyronitrile) (AIBN) as an initiator and the copolymers I, II and III collected respectively. The very bulky tris(trimethylsilyl)methyl {trisyl} substituents were covalently attached to the obtained copolymers with replacement of all the chlorine atoms in CMS units. The polymers, obtained in quantitative yields, were characterized by FT-IR, 1H NMR and 13C NMR spectroscopy; differential scanning calorimetry (DSC) and GPC studies. All the polymers containing trisyl groups showed a high glass transition temperature (in the range 150-190 °C) in comparison with copolymers I-III (in the range 90-95 °C). The increase of the glass transition temperature reflects the substantial increase in rigidity of new polymers bearing very bulky substituents in side chains. |
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Keywords: | 4-Chloromethyl styrene Tris(trimethylsilyl)methyl group Steric hindrance Copolymerization Glass transition temperature |
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