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Studies of the fractionation of polyoxymethylene
Author(s) -
Kobyashi Eiichi,
Okamura Seizo,
Signer Rudolf
Publication year - 1968
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.1968.070120715
Subject(s) - polyoxymethylene , trioxane , fractionation , polymer , molar mass distribution , polymerization , materials science , polymer chemistry , chemical engineering , chemistry , composite material , chromatography , engineering
The precipitation of polyoxymethylene in p‐chlorophenol solution and the molecular weight fractionation of the polymer by mechanical agitation were investigated. The agitation of the solution was carried out in a glass vessel with a stirrer, usually at 60°C. After agitation for several minutes a fibrous polymer precipitated. High molecular weight polymer precipitated around the stirrer in an early stage, and therefore the method might be applied to the fractionation of polyoxymethylene. The method was applied to the fractionation of polyoxymethylene prepared in a solid‐state and in a solution polymerization of trioxane, catalyzed by BF 3 .OEt 2 . It was found that the polymer from the solid state contained a small amount of extremely high molecular weight fraction, and that obtained from the solution had a relatively narrow distribution of molecular weight.