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Melting and glass transition of radiation‐induced graft polyethylene
Author(s) -
Toi Keio,
Kikuchi Midori,
Tokuda Taneki
Publication year - 1977
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.1977.070210219
Subject(s) - polystyrene , polyethylene , glass transition , materials science , crystallite , amorphous solid , melting point , grafting , styrene , enthalpy of fusion , composite material , polymer chemistry , polymer , fusion , melting temperature , copolymer , chemistry , crystallography , linguistics , philosophy , metallurgy
Melting and glass transition data are reported employing DSC for styrene‐grafted high‐density polyethylene obtained by γ radiation. Judging from the data of the melting point and the heat of fusion, the grafted polystyrene had no effect on the polyethylene crystallites, but the half‐width of the thermogram was observed to increase slightly, showing an effect on the crystallite size distribution. As no effect was observed on the glass transition temperature by grafting, the amorphous region of the polyethylene apparently was not affected. It is suggested, therefore, that the free volume or segmental mobility will not be decreased by radiation‐induced grafting. Very few but long grafted chains had negligible effect on the average polyethylene chain length available for segmental motion, and grafted polystyrene should be expected to differ little from the styrene homopolymer in thermal motions.