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Structure‐mechanical property relationships in ethylene methacrylic acid copolymers and their salts
Author(s) -
MacKnight W. J.,
Kajiyama T.,
McKenna L.
Publication year - 1968
Publication title -
polymer engineering and science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.503
H-Index - 111
eISSN - 1548-2634
pISSN - 0032-3888
DOI - 10.1002/pen.760080406
Subject(s) - copolymer , materials science , polyethylene , methacrylic acid , ionic bonding , phase (matter) , amorphous solid , polymer chemistry , lithium (medication) , polymer , chemical engineering , organic chemistry , ion , composite material , chemistry , medicine , engineering , endocrinology
A dynamic mechanical study has been made of an ethylenemethacrylic acid copolymer containing 4.1 mole per cent of methacrylic acid units and its sodium, lithium and calcium salts. On the basis of the results and related physical chemical studies it is proposed that the structures of the ionized copolymers consist of three distinct phases—a crystalline polyethylene phase, an amorphous polyethylene phase, and an ionic phase consisting of ionic domains. It is further proposed that the unionized acid copolymer consists of two phases—a crystalline polyethylene phase and an amorphous phase consisting of polyethylene crosslined with hydrogen bonded, carboxylic acid dimers.