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An empirical correlation between glass transition temperatures and structural parameters for polymers with linear and branched alkyl substituents
Author(s) -
Gao Hang,
Harmon Julie P.
Publication year - 1997
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/(sici)1097-4628(19970418)64:3<507::aid-app7>3.0.co;2-o
Subject(s) - glass transition , polymer , alkyl , polymer chemistry , methacrylate , materials science , hydrogen bond , side chain , thermodynamics , chemistry , organic chemistry , molecule , monomer , composite material , physics
A new quantitative model is proposed to correlate glass transition temperatures with bond radii‐based structural parameters for poly( p ‐alkyl styrenes), poly‐olefins, poly(alkyl methacrylates), and poly(alkyl acrylates). The model provides a consistent prediction of the glass transition temperatures for both the linear and highly branched polymers up to the entanglement offset points for long side groups. Polymers with highly branched side chains, such as t ‐butyl and t ‐pentyl groups that contain quaternary C groups, are predicted to have much higher glass transition temperatures, followed by the methylated, the unsubstituted, and the linearly alkylated polymers. The predictions are confirmed by the experimental results from the authors' research and literature. The current model also allows the extraction of the contribution of hydrogen bonding to glass transition temperatures in polymethacrylates and polyacrylates by comparing differences between the modeled hydrogen‐bonding free values with the experimental data. © 1997 John Wiley & Sons, Inc. J Appl Polym Sci 64: 507–517, 1997