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Transitions and relaxations of linear polyesters related to poly(ethylene terephthalate). I. Melting
Author(s) -
Yip Harry K.,
Williams H. Leverne
Publication year - 1976
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.1976.070200507
Subject(s) - crystallinity , enthalpy of fusion , methylene , polyester , materials science , poly ethylene , ethylene , polymer chemistry , fusion , melting temperature , melting point , thermodynamics , crystallography , composite material , organic chemistry , chemistry , physics , linguistics , philosophy , catalysis
Observations obtained by other techniques were confirmed by DSC analyses. As the length of the methylene chain increased, T m decreased, and crystallinity, heat capacity, and heat of fusion increased. The T m and crystallinity of the isophthalate esters were lower than for the corresponding terephthalate esters. The values for an odd‐numbered methylene sequence were lower than for the adjacent even‐numbered members. A model was used to calculate the heat of fusion of theoretically 100% crystalline poly(hexamethylene isophthalate) and poly(decamethylene isophthalate).