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Isothermal and nonisothermal melt‐crystallization kinetics of syndiotactic polystyrene
Author(s) -
Chen Qingyong,
Yu Yingning,
Na Tianhai,
Zhang Hongfang,
Mo Zhishen
Publication year - 2002
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.10192
Subject(s) - polystyrene , crystallization , tacticity , nucleation , differential scanning calorimetry , materials science , activation energy , isothermal process , thermodynamics , kinetics , polymer chemistry , surface energy , kinetic energy , chemistry , composite material , polymer , polymerization , physics , quantum mechanics
Analyses of the isothermal and nonisothermal melt kinetics for syndiotactic polystyrene have been performed with differential scanning calorimetry, and several kinetic analyses have been used to describe the crystallization process. The regime II→III transition, at a crystallization temperature of 239°, is found. The values of the nucleation parameter K g for regimes II and III are estimated. The lateral‐surface free energy, σ = 3.24 erg cm −2 , the fold‐surface free energy, σ e = 52.3 ± 4.2 erg cm −2 , and the average work of chain folding, q = 4.49 ± 0.38 kcal/mol, are determined with the (040) plane assumed to be the growth plane. The observed crystallization characteristics of syndiotactic polystyrene are compared with those of isotactic polystyrene. The activation energies of isothermal and nonisothermal melt crystallization are determined to be Δ E = −830.7 kJ/mol and Δ E = −315.9 kJ/mol, respectively. © 2002 Wiley Periodicals, Inc. J Appl Polym Sci 83: 2528–2538, 2002