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Copolymerization and thermal behavior of methyl methacrylate with N ‐(phenyl/ p ‐tolyl) itaconimides
Author(s) -
Anand Vishal,
Choudhary Veena
Publication year - 2003
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.12138
Subject(s) - copolymer , polymer chemistry , methyl methacrylate , glass transition , monomer , mole fraction , thermal stability , aryl , methacrylate , azobisisobutyronitrile , reactivity (psychology) , tetrahydrofuran , materials science , solvent , chemistry , polymer , organic chemistry , alkyl , medicine , alternative medicine , pathology
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 1 H‐NMR spectroscopy using the proton resonance signals attributed to –OCH 3 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 r 1 (PTI) = 1.33 ± 0.05/ r 2 (MMA) = 0.24 ± 0.03 and r 1 (I) = 1.465 ± 0.035/ r 2 (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 ( T g ) 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