Dilatometric study of the melting point of three high‐pressure crystallized samples of marlex polyethylene

Abstract

synopsisThe melting points of t,hree polyethylenes differing in molecular weight distribution from 47,000 to 147,000 were determined as 141OC f 0.5OC 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.