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Dilatometric study of the melting point of three high‐pressure crystallized samples of marlex polyethylene
Author(s) -
Waldman N.,
Beyer G. H.,
Griskey R. G.
Publication year - 1970
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.1970.070140312
Subject(s) - dilatometer , melting point , materials science , polyethylene , annealing (glass) , thermodynamics , melting temperature , volume (thermodynamics) , thermal expansion , analytical chemistry (journal) , composite material , mineralogy , chemistry , chromatography , physics
The melting points of three polyethylenes differing in molecular weight distribution from 47,000 to 147,000 were determined as 141°C ± 0.5°C by dilatometric techniques. Sample preparation procedures were developed to ensure uniform thermal history prior to measuring length as a function of temperature in a precision dilatometer. The specific volume data were reproducible within 0.02%, reflecting the careful annealing procedure used and the extended time allowed for equilibrium to be attained.