Premium
Unbiased evaluation of literature data on equilibrium melting temperature and enthalpy of fusion of perfectly syndiotactic polypropylene
Author(s) -
Supaphol Pitt
Publication year - 2000
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 - 10.1002/1097-4628(20010228)79:9<1603::aid-app90>3.0.co;2-q
Subject(s) - tacticity , enthalpy of fusion , thermodynamics , melting point depression , extrapolation , melting point , enthalpy , fusion , materials science , polypropylene , polymer chemistry , chemistry , polymer , physics , mathematics , philosophy , composite material , polymerization , linguistics , mathematical analysis
The thermodynamic properties of highly syndiotactic polypropylene (PP) were reevaluated based on the data taken from the literature. The thermodynamic equilibrium melting temperature of a perfectly syndiotactic PP, which was estimated based on the Flory theory for the depression of the melting point in random copolymers, was 168.0°C. However, it was found to be 174.2°C when a linear extrapolation was attempted on a plot of the observed equilibrium melting temperature against the syndiotacticity level. The thermodynamic enthalpy of fusion of a perfect crystal of fully syndiotactic PP was estimated to be 8.7 kJ mol −1 , and the average value of the literature data was 7.8 kJ mol −1 . © 2000 John Wiley & Sons, Inc. J Appl Polym Sci 79: 1603–1609, 2001