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Stress‐induced chemiluminescence from nylon 66 fibers
Author(s) -
George G. A.,
Egglestone G. T.,
Riddell S. Z.
Publication year - 1982
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.1982.070271031
Subject(s) - materials science , chemiluminescence , nylon 6 , composite material , arrhenius equation , fiber , stress (linguistics) , ultimate tensile strength , polymer , arrhenius plot , activation energy , nylon 66 , deformation (meteorology) , amorphous solid , polymer chemistry , chemistry , organic chemistry , linguistics , philosophy , polyamide
The emission of visible light during the tensile deformation of medium‐ and high‐tenacity nylon 66 yarns in air has been studied at strain rates of 0.63–200%/min and at temperatures of 20–110°C. Emission is observed only in an oxidative atmosphere and increases with temperature according to an Arrhenius relation. The activition energy decreases with applied stress. The intensity at any temperature can be described by the sum of a component linear with stress and another exponential in stress above ∼60% of the ultimate strength. These results and the measured spectral distribution suggest that light emission arises from bimolecular termination of alkyl peroxy macroradicals. The chemiluminescence growth curves indicate that the applied stress increases the oxidation rate of the fiber due to internal and external frictional heating while, at high strains, stress‐induced main‐chain scission occurs up to fiber failure. The growth curve is sensitive to the load history of the fiber. The chemiluminescence decay curves are a sensitive probe of radical reactions such as cage termination and stabilizer scavenging in the amorphous region of the polymer.