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Tear strength theory of semicrystalline polymers
Author(s) -
Rohn C. L.
Publication year - 1983
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.1983.070281001
Subject(s) - crystallinity , polyethylene , amorphous solid , polymer , materials science , thermodynamics , lattice (music) , composite material , polymer chemistry , crystallography , physics , chemistry , acoustics
A theroretical model describing how the tear strenght of semicrystalline polymers depends upon the interaction of the crystalline and amorphous phases is presented. It is based upon the “freevolume“ theory and a “Hooke's law ‐lattice energy” treatment. The strength T M is hypothesized to be partitioned between the crystalline Q c and amorphous Q a phases. Therefore T M ∝ Q c . Q a , T M = T o . Q c . Q a , where Q c = NKTE / bY 2 and e −v/vf = G / G oτ . Proof of this theory is obtained by measuring the oxygen transmission rates of 11 polyethylene film samples varying in tear strenght. Good agreement exists between T M (experimental) and T M (theroetical) for 9 of the polyethylene samples. The other 2 Samples differ from the theory by factor of 2. One explantion of this departure is the τ varies from unity.