par Verheulpen Heymans, Nicole 
Référence Journal of polymer science. Part B, Polymer physics, 29, 10, page (1193-1201)
Publication Publié, 1991-09
Référence Journal of polymer science. Part B, Polymer physics, 29, 10, page (1193-1201)
Publication Publié, 1991-09
Article révisé par les pairs
| Résumé : | A model for the effect of orientation dependence of polarizability anisotropy on birefringence is given and compared with literature data. If this dependence arises through bond angle distortion, the model shows a significant contribution to birefringence but a very small contribution to strain, accounting satisfactorily for differences in birefringence between hot-drawn and cold-drawn samples, for discrepancies between measurements of orientation obtained by different experimental methods and for previous observations on orientational behavior of preoriented polycarbonate at low additional strain. |
