Premium
Procedure for calculating the crystallinity of ethylene–vinyl acetate copolymers and low‐density polyethylene as a function of temperature
Author(s) -
Barlow A.,
Young M.
Publication year - 1970
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.1970.070140707
Subject(s) - crystallinity , materials science , polyethylene , ethylene vinyl acetate , polymer , polymer chemistry , copolymer , vinyl acetate , melting point , linear low density polyethylene , ethylene , crystallite , thermodynamics , chemical engineering , composite material , organic chemistry , chemistry , physics , catalysis , engineering , metallurgy
A method is described for determining the x‐ray crystallinity of ethylene–vinyl acetate copolymers at differing temperatures. An equation is derived for the symmetrical curves of crystallinity versus temperature thus obtained, from which the crystallinity at any temperature can be calculated. In order to determine the constants of the equation for a particular polymer, it is only necessary to determine the melting point and per cent crystallinity of the resin at a known temperature. The equation can also be applied to conventional polyethylenes, but not to linear polyethylenes. It is suggested that this is due to the former resins having a broad crystallite size distribution compared with the narrow distribution present in high‐density polyethylene.