par Verheulpen Heymans, Nicole
Référence Polymer, 27, 8, page (1177-1182)
Publication Publié, 1986
Article révisé par les pairs
Résumé : Recent investigations into the development of molecular orientation on straining in the glass transition range and above (e.g. refs. 1 and 2) have led to interpretation of results in terms of rubber elasticity theory, discrepancies being accounted for via a strain-dependent entanglement molecular weight. It has been shown recently that experimental orientation functions can also be adequately described by a model involving two components of strain (extensional and orientational)3; nevertheless, it might be wondered whether part of the above-mentioned discrepancy could stem from an inadequacy of the rubber-elasticity theory in the case of short-chain molecules, i.e. chains in which the number of statistical segments is too small for statistical methods to apply. This work was undertaken in order to compare orientation functions obtained using alternative models with those derived from classical theories. © 1986.