13C NMR spectroscopy of head-to-head polystyrene: Molecular motion in solution

✍ Scribed by F. Lauprêtre; L. Monnerie; O. Vogl

• Publisher: Elsevier Science
• Year: 1978
• Tongue: English
• Weight: 253 KB
• Volume: 14
• Category: Article
• ISSN: 0014-3057
• DOI: 10.1016/0014-3057(78)90154-4

✦ Synopsis

Head-to-head polystyrene was studied by NMR relaxation measurements in solution and these measurements were compared with those for head-to-tail polystyrene. By measuring the relaxation of the ortho and meta carbons of the phenyl rings of the polystyrenes, it was found that the head-to-head polystyrene chain is stiffer (T~, = 65 °) than the head-to-tail chain (T,~ = 54°). These results are in agreement with the measurements of the radius of gyration, and results from the study of the melt rheology of head-to-head and head-to-tail polystyrene.

R~um6--Des mesures en solution des temps de relaxation spin-r6seau Tl par RMN du Carbone 13 ont montr6 que la chaSne du polystyr6ne t6te-h-t~te est plus rigide que celle du polystyrene t~te-aqueue. Ces r6sultats sont en bon accord avec les d6terminations de rayons de giration, et les 6tudes rh6ologiques h l'(~tat fondu, effectu6es sur ces deux polym6res.