We have measured the tracer diffusion coefficient in PS films oriented by surface rubbing. The results show that the diffusion perpendicular to the rubbed surface is slower in oriented than in nonoriented chains. The decrease of the diffusion coefficient was correlated with the total oriented volume as determined by birefringence measurements.
Pu, Y.; White, H.; Rafailovich, M. H.; Sokolov, J.; Schwarz, S. A.; Dhinojwala, Ali; Agra-Kooijman, Dena Mae; Kumar, Satyendra (2001). Chain Orientation and Its Effect on Mobility at a Rubbed Surface. Macromolecules 34(14) 4972-4977. doi: 10.1021/ma002039u. Retrieved from https://oaks.kent.edu/article/chain-orientation-and-its-effect-mobility-rubbed-surface