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Transformation of liquid to amorphous solid: The time to vitrify for styrene polymerization
Author(s) -
Aronhime M. T.,
Gillham J. K.
Publication year - 1984
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.1984.070290610
Subject(s) - polymerization , materials science , polymer chemistry , vitrification , polymer , thermodynamics , monomer , isothermal process , glass transition , radical polymerization , volume fraction , kinetic chain length , bulk polymerization , molar mass distribution , composite material , medicine , physics , andrology
A model is presented for the calculation of the time to vitrify vs. temperature for isothermal polymerization by the chain growth mechanism. The model is based on the glass transition temperature ( T g ) rising from its initial value to the reaction temperature. The relationships between T g and the volume fraction of polymer and monomer, the volume fraction of polymer and the extent of reaction, and the extent of reaction and time are also required. In a plot of temperature vs. time the vitrification curve is generally S‐shaped; the time passes through a maximum just above the glass transition temperature. The model applies to linear polymerization in which monomer and high molecular weight polymer are the dominant species, i.e., to chain reactions. In this communication the model is applied to the bulk polymerization of styrene by the free radical mechanism.