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Thermal properties of ethylene ionomers
Author(s) -
Tsujita Y.,
Shibayama K.,
Takizawa A.,
Kinoshita T.,
Uematsu I.
Publication year - 1987
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.1987.070330421
Subject(s) - differential scanning calorimetry , ethylene , materials science , crystallization , annealing (glass) , polyethylene , ionic bonding , recrystallization (geology) , polymer chemistry , endothermic process , amorphous solid , glass transition , chemical engineering , polymer , crystallography , chemistry , thermodynamics , composite material , organic chemistry , ion , adsorption , catalysis , paleontology , physics , biology , engineering
The annealing effect of ethylene ionomers annealed at various temperatures and for various periods was studied by differential scanning calorimetry. Two endothermic melting peaks were observed for all the ethylene ionomers annealed. The melting peak at the lower temperature, which was assigned to bundlelike crystal owing to a Hoffman‐Weeks relationship, shifted to a higher temperature with the annealing temperature and period, indicative of recrystallization. There is physical cross‐linking consisting of ionic aggregates, such as multiplets and clusters in ethylene ionomers. The crystallization kinetics of ethylene ionomers was fundamentally similar, but different from that of low‐density polyethylene. Crystallization and recrystallization suggested a mobile ethylene chain in both amorphous regions and ionic aggregates even in the presence of cross‐linking.