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Heat Capacity and Equilibrium Polymerization of Vitreous Se
Author(s) -
MOYNIHAN C. T.,
SCHNAUS U. E.
Publication year - 1971
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1151-2916.1971.tb12240.x
Subject(s) - polymerization , heat capacity , thermodynamics , monomer , enthalpy , glass transition , polymer , materials science , chemistry , polymer chemistry , composite material , physics
The contribution to the heat capacity of liquid Se, C̄ p,r , arising from the ring‐polymer equilibrium was calculated from the equilibrium polymerization theory of Tobolsky and co‐workers. Above the polymerization transition temperature (∼360°K), C̄ p,r ∼(1/8)(Θ H 3 2 /RT 2 )(M/M o ) , where Θ H 3 is the enthalpy change for the polymerization propagation step and (M/M 0 ) is the monomer fraction of Se 8 rings. Below the transition temperature, C̄ p,r is negligibly small. Heat capacities were measured for glassy and liquid Se from 180° to 280°K and from 320° to BOOK, respectively. Using available literature data and the equilibrium polymerization theory, the temperature dependence of the heat capacity of liquid Se was calculated; it agreed within experimental error with the measured temperature dependence.