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Thermodynamics of random copolymers of N ‐vinylcarbazole and 4‐alkylstyrenes
Author(s) -
Privalko V. P.,
Arbuzova A. P.,
Korskanov V. V.,
Zagdanskaya N. E.
Publication year - 1994
Publication title -
polymer international
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.592
H-Index - 105
eISSN - 1097-0126
pISSN - 0959-8103
DOI - 10.1002/pi.1994.210350206
Subject(s) - thermodynamics , heat capacity , thermal diffusivity , copolymer , glass transition , alkyl , diad , materials science , polymer chemistry , substituent , homologous series , chemistry , polymer , organic chemistry , physics
Abstract Random copolymers of N ‐vinylcarbazole (VC) and alkylstyrenes with variable molar content of VC (first series) or variable size of alkyl substituent (second series) were characterized by the heat capacity measured at normal pressure in the temperature interval 203–523 K, as well as by measurements of specific volume and thermal diffusivity in the temperature interval 303–523 K and in the pressure range 30–100 MPa. It was established that the increase of thermal mobility of chain repeating units with the molar ratio of hexylstyrene (in the first series) or with the alkyl chain length (in the second series) manifests itself as a shift to lower temperatures of the glass transition temperature, as well as an increase of heat capacity, thermal diffusivity and effective number of external degrees of freedom per chain repeating unit from the Simha–Somcynsky reduced equation of state. The inadequacy of the simple diad additivity scheme for a quantitative description of structure–property relationships for the copolymers studied is emphasized.