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Effect of radiolysis on the glass transition temperature of poly (methyl methacrylate)
Author(s) -
Thominette F.,
Pabiot J.,
Verdu J.
Publication year - 1989
Publication title -
makromolekulare chemie. macromolecular symposia
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.257
H-Index - 76
eISSN - 1521-3900
pISSN - 0258-0322
DOI - 10.1002/masy.19890270116
Subject(s) - differential scanning calorimetry , glass transition , steric effects , annealing (glass) , methyl methacrylate , polymer chemistry , irradiation , materials science , methacrylate , transition temperature , analytical chemistry (journal) , chemistry , thermodynamics , polymer , composite material , polymerization , chromatography , organic chemistry , physics , superconductivity , quantum mechanics , nuclear physics
Abstract A bulk PMMA sample was irradiated by gamma rays (0.69 Gy. s −1 ), and its structural changes were monitored by steric exclusion chromatography, differential scanning calorimetry, dynamic mechanical spectroscopy and dilatometry. The glass transition temperature T g decreases more than predicted from the molecular weight data, but the corresponding excess of change is not thermoreversible and can be suppressed by annealing. Strong not thermoreversible changes are also observed around the first secondary transition temperature (≈ 60°C) as well as in mechanical spectra and in dilatometric curves. Various hypothetical explanations are examined.