Open AccessThe hexagonal phase and melt of low‐molecular‐weight polyethylene
Author(s) -
Asahi Takanao
Publication year - 1984
Publication title -
journal of polymer science: polymer physics edition
Language(s) - English
Resource type - Journals
eISSN - 1542-9385
pISSN - 0098-1273
DOI - 10.1002/pol.1984.180220203
Subject(s) - nitric acid , polyethylene , hexagonal crystal system , phase diagram , phase (matter) , materials science , polymer chemistry , hexagonal phase , molecular mass , chemistry , organic chemistry , analytical chemistry (journal) , crystallography , enzyme
Phase diagrams of low‐molecular‐weight polyethylene ( M = 1000, 2000, 6500, 16,000) and polyethylene (M ≈ 1,000) after fuming nitric acid treatment have been determined from 20 to 300°C up to pressures of about 10 kbar. The fractions with molecular weights 1000 and 2000 do not exhibit the hexagonal phase, but the others do. Effects of molecular weight and fuming nitric acid treatment on the phase diagrams are discussed in terms of the entropy of the melt.
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