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Interrelation between mechanical response, strain field, and local free volume evolution in glassy polymers: seeking the atomistic origin of post-yield softening
, Article Express Polymer Letters ; Volume 12, Issue 1 , January , 2018 , Pages 2-12 ; 1788618X (ISSN) ; Bagheri, R ; Gigl, T ; Hugenschmidt, C ; Raps, D ; Altstadt, V ; Sharif University of Technology
BME-PT and GTE
2018
Abstract
A set of complementary experiments are used for the first time to elucidate the interrelation between the mechanical properties, the strain field, and the free volume evolution during non-homogenous compression of aglassy polymer. Two sets of quenched and annealed polystyrene samples, having different free volume histories, are notched and exposed to compression. The variation of both the strain field and the free volume are measured on a microscopic scale via digital image correlation in case of strain and Doppler broadening spectroscopy of positron annihilation line in case of free volume measurements. Eventually, the interplay between the local evolution of free-volume, the local strain...