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On the long‐term strength of specimens made of phenol‐formaldehyde press powders
Author(s) -
Natov M.,
Vasileva S.,
Kotsev G.
Publication year - 1987
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.1987.070330607
Subject(s) - formaldehyde , polymer , materials science , polyethylene , tension (geology) , composite material , phenol , vinyl chloride , deformation (meteorology) , polymer chemistry , stress (linguistics) , term (time) , chloride , chemical engineering , chemistry , organic chemistry , ultimate tensile strength , physics , metallurgy , linguistics , philosophy , quantum mechanics , engineering , copolymer
The study of the long‐term strength (LTS) of polyethylene, poly(vinyl chloride), and polyoximethylene shows that the In τ–σ relation for specimens, undergoing tension, is S‐shaped. Structure changes during the process of deformation may occur in these polymers. However, the structure of spatial‐grid polymers (solidifying phenol–formaldehyde resins, for instance) does not prove to be stress‐sensitive and experiments show that the In τ–σ relation can be described with sufficient accuracy by employing an equation of the form τ = τ 0 exp[( U − γσ)/( RT + ασ n )].