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Enthalpy relaxation of filled copolymers
Author(s) -
Kumar S.,
Salovey R.
Publication year - 1985
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.1985.070300604
Subject(s) - copolymer , enthalpy , styrene , materials science , differential scanning calorimetry , polymer chemistry , carbon black , annealing (glass) , standard enthalpy of reaction , methyl methacrylate , methacrylate , calorimetry , thermodynamics , polymer , composite material , natural rubber , physics
Abstract Excess enthalpy following annealing at various periods of time at T g −10°C was measured by differential scanning calorimetry of electrophotographic toners, copolymers of styrene and butyl methacrylate containing carbon black. An approximate equilibrium enthalpy relaxation after annealing the pure copolymers for one month was 3.30 kJ/kg for a copolymer with 66.5% styrene and 2.72 kJ/kg for a copolymer containing 49.8% styrene. The rate of enthalpy relaxation was reduced by increasing the styrene content of the pure copolymer. The incorporation of a carbon black with high surface area reduces the rate of enthalpy relaxation, increasing in effectiveness with butyl methacrylate concentration.