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Physical properties of high‐pressure ethylene vinylacetate copolymers and their saponified derivatives
Author(s) -
Koopmans R. J.,
Linden R. Van Der,
Vansant E. F.
Publication year - 1983
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.760230604
Subject(s) - copolymer , materials science , saponification , ethylene , crystallinity , alkyl , polymer chemistry , polyethylene , chemical engineering , composite material , organic chemistry , polymer , catalysis , chemistry , engineering
The physical properties of high‐pressure ethylene vinylacetate (EVA) copolymers having an average melt index of 8.5 g/10 min and a mol% of VA less than 20 are studied. A comparison is made with the properties of their saponified derivatives, the ethylene vinylalcohol (EVAl) co‐ and ethylene vinylalcohol vinylacetate (EVAlVA) terpolymers. A melt‐index effect is noted. Density, thermal, and mechanical properties of EVA copolymers are determined by the degree of crystallinity, which depends on the mol% VA and on the degree of alkyl shortchain branches. EVAlVA terpolymer properties depend on the residual mol% VA. EVAl copolymers proved to have some properties similar to low‐density polyethylene. The hydrogen‐bonding effect via hydroxyl groups was negligible for this level of vinylalcohol incorporation.