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The glass transition temperature of star‐shaped polystyrenes
Author(s) -
Roovers J. E. L.,
Toporowski P. M.
Publication year - 1974
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.1974.070180609
Subject(s) - glass transition , differential scanning calorimetry , polystyrene , isoprene , materials science , polymer , polymer chemistry , transition temperature , penetration (warfare) , composite material , thermodynamics , copolymer , physics , superconductivity , quantum mechanics , operations research , engineering
The glass transition temperatures of linear and four‐ and six‐branched regular star polystyrenes are measured by penetration, differential scanning calorimetry, and a density gradient technique. The results of the three methods show that the glass transition temperature depends on the concentration of chain ends in the polymer sample. An attempt is made to assess the influence of the presence of the branch point on the glass transition temperature using a series of four‐branched polystyrenes containing varying amounts of isoprene near the branch point. However, any effect of the central branch point on the glass transition temperature is obscured by plastification of polystyrene by polyisoprene.