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Radical formation and deformation in poly‐p‐(2‐hydroxyethoxy) benzoic acid fibers
Author(s) -
Nagamura T.,
Devries K. L.
Publication year - 1979
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.760190206
Subject(s) - radical , materials science , benzoic acid , reaction rate constant , deformation (meteorology) , strain rate , kinetics , strain (injury) , electron paramagnetic resonance , ultimate tensile strength , composite material , polymer chemistry , chemistry , organic chemistry , nuclear magnetic resonance , medicine , physics , quantum mechanics
Radical generation during tensile deformation of poly‐p‐(2‐hydroxyethoxy) benzoic acid (PEOB) fibers was studied by electron spin resonance techniques under various stretching conditions. Primary phenoxy radicals were detected at room temperature, indicating main‐chain rupture during mechanical loading. The kinetics of phenoxy radical formation were observed at constant strain, constant load, constant strain‐rate, and in constant load rate experiments. The effect of strain rate on the radical formation was found to be larger in this sample than was observed in Nylon 6. These results coupled with other experimental observations have yielded information on a basic structural model and improved insight into the basic molecular mechanism responsible for deformation and fracture.