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Reactivity ratios and thermal and dielectric studies of n ‐butyl methacrylate and methacrylamide copolymers
Author(s) -
Srinivasulu B.,
Rao P. Raghunath,
Sundaram E. V.,
Sathaiah G.,
Sirdeshmukh Lalitha
Publication year - 1993
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.1993.070470817
Subject(s) - methacrylamide , azobisisobutyronitrile , copolymer , polymer chemistry , reactivity (psychology) , methacrylate , glass transition , methyl methacrylate , dielectric , materials science , formamide , chemistry , organic chemistry , acrylamide , polymer , composite material , alternative medicine , optoelectronics , pathology , medicine
Free‐radical copolymerization of n ‐butyl methacrylate (B) and methacrylamide (M) was carried out in the presence of 2,2'‐azobisisobutyronitrile (AIBN) in dimethyl formamide (DMF) at 60°C. The percentage composition of the copolymers was established by elemental analysis. The reactivity ratios as determined by the Finemann—Ross (F—R) and the Kelen–Tüdős (K—T) methods are r 1 (B) = 2.75 ± 0.01, r 2 (M) = 0.2 ± 0.01 and r 1 = 2.70 ± 0.05, r 2 = 0.19 ± 0.02, respectively. The copolymers were characterized by IR, 1 H‐NMR, thermal, and dielectric studies. Glass transition temperature ( T g ) values were determined by DSC. Dielectric studies were carried out to understand the segmental motions and the effect of composition on dielectric loss. © 1993 John Wiley & Sons, Inc.