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Synthesis, characterization, and reactivity ratios of copolymers derived from 4‐nitrophenyl acrylate and n ‐butyl methacrylate
Author(s) -
Thamizharasi S.,
Gnanasundaram P.,
Balasubramanian S.
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.11810
Subject(s) - copolymer , polymer chemistry , reactivity (psychology) , glass transition , monomer , methacrylate , benzoyl peroxide , acrylate , gel permeation chromatography , materials science , butyl acrylate , polymer , chemistry , composite material , medicine , alternative medicine , pathology
Free‐radical copolymerization of 4‐nitrophenyl acrylate (NPA) with n ‐butyl methacrylate (BMA) was carried out using benzoyl peroxide as an initiator. Seven different mole ratios of NPA and BMA were chosen for this study. The copolymers were characterized by IR, 1 H‐NMR, and 13 C‐NMR spectral studies. The molecular weights of the copolymers were determined by gel permeation chromatography and the weight‐average ( M w ) and the number‐average ( M n ) molecular weights of these systems lie in the range of 4.3–5.3 × 10 4 and 2.6–3.0 × 10 4 , respectively. The reactivity ratios of the monomers in the copolymer were evaluated by Fineman–Ross, Kelen–Tudos, and extended Kelen–Tudos methods. The product of r 1 , r 2 lies in the range of 0.734–0.800, which suggests a random arrangement of monomers in the copolymer chain. Thermal decomposition of the polymers occurred in two stages in the temperature range of 165–505°C and the glass transition temperature ( T g ) of one of the systems was 97.2°C. © 2003 Wiley Periodicals, Inc. J Appl Polym Sci 88: 1817–1824, 2003