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Copolymerization and thermal behavior of methyl methacrylate with N-(phenyl/p-tolyl) itaconimides

Authors

  • Vishal Anand,

    1. Centre for Polymer Science and Engineering, Indian Institute of Technology, Delhi, Hauz Khas, New Delhi 110016, India
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  • Veena Choudhary

    Corresponding author
    1. Centre for Polymer Science and Engineering, Indian Institute of Technology, Delhi, Hauz Khas, New Delhi 110016, India
    • Centre for Polymer Science and Engineering, Indian Institute of Technology, Delhi, Hauz Khas, New Delhi 110016, India
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Abstract

This study describes the synthesis, characterization, and thermal behavior of copolymers of methyl methacrylate (MMA) and N-p-tolyl itaconimide (PTI)/N-phenyl itaconimide (I). Homopolymerization and copolymerization of N-(phenyl/p-tolyl) itaconimide with MMA was carried out by use of various mole fractions of N-aryl itaconimide in the initial feed from 0.1 to 0.5, using azobisisobutyronitrile as an initiator and tetrahydrofuran as the solvent. The copolymer composition was determined by 1H-NMR spectroscopy using the proton resonance signals attributed to –OCH3 of MMA (δ = 3.5–3.8 ppm) and the aromatic protons (δ = 7.0–7.5 ppm) of N-aryl itaconimide. The reactivity ratios of the monomers were found to be r1 (PTI) = 1.33 ± 0.05/r2 (MMA) = 0.24 ± 0.03 and r1 (I) = 1.465 ± 0.035/r2 (MMA) = 0.385 ± 0.005. The molecular weight of the copolymers decreased with increasing mole fraction of N-aryl itaconimide in the copolymers. Glass-transition temperature (Tg) and thermal stability of PMMA increased with increasing amounts of itaconimides in the polymer backbone. A significant increase in the percentage char yield at 700°C was observed on incorporation of a low mole fraction of N-aryl itaconimides. © 2003 Wiley Periodicals, Inc. J Appl Polym Sci 89: 1195–1202, 2003

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