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Compositional Variation of Glass‐Transition Temperature in Miscible Polymer Blends Involving Weak and Strong Specific Interactions
Author(s) -
Múgica A.,
Calahorra M. E.,
Cortázar M.
Publication year - 2002
Publication title -
macromolecular chemistry and physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.57
H-Index - 112
eISSN - 1521-3935
pISSN - 1022-1352
DOI - 10.1002/1521-3935(20020501)203:8<1088::aid-macp1088>3.0.co;2-u
Subject(s) - miscibility , glass transition , polymer blend , polystyrene , styrene , polymer , materials science , intermolecular force , polymer chemistry , hydrogen bond , methacrylate , thermodynamics , chemistry , copolymer , molecule , organic chemistry , composite material , physics
The miscibilities of some styrene derivatives (polystyrene (PS), poly( p ‐methylstyrene) (PPMS) and poly( p ‐vinyl phenol) (PVPh)) with poly(cyclohexyl methacrylate) (PCHMA) have been compared by studying their compositional variation of glass‐transition temperatures ( T g ). The mixtures of PS and PPMS with PCHMA were found to be miscible over the full composition range whereas PVPh/PCHMA blends showed two phase behaviours. Only when S was copolymerized with VPh at high styrene content (P(S 75 ‐ co ‐VPh 25 )) was miscibility observed with PCHMA. All the blends studied exhibited a non‐additive composition dependence, showing both negative (PS/PCHMA and PPMS/PCHMA blends) and positive (PVPh/PMMA and P(S 75 ‐ co ‐VPh 25 )/PCHMA blends) deviations from additivity. Positive deviations indicate the presence of significant specific interactions between the two polymers. The lattice‐fluid theory was combined with the Gibbs–DiMarzio approach to study the compositional variation of T g and an extension of this last theory to hydrogen bonding was applied to mixtures with strong specific intermolecular interactions. The flex energy values and their compositional variation, as well as the hydrogen bonding contribution have been used to study the T g s.