Is the chain dynamics in thin polymer films isotropic?

被引:5
作者
Rivillon, S [1 ]
Auroy, P
Deloche, B
机构
[1] Univ Paris 11, UMR 8502 CNRS, Phys Solides Lab, F-91405 Orsay, France
[2] Inst Curie, Sect Rech, UMR 168 CNRS, F-75005 Paris, France
来源
JOURNAL DE PHYSIQUE IV | 2000年 / 10卷 / P7期
关键词
D O I
10.1051/jp4:2000746
中图分类号
O4 [物理学];
学科分类号
0702 ;
摘要
The dynamics of molten polymer chains (polydimethylsiloxane) confined between air and a solid, wettable and non-adsorbing surface. is investigated using NMR. The basic approach used here consists in studying how nuclear interactions are time-averaged by rapid molecular motions. Chain segments in such molten films undergo uniaxial reorientations around the normal to the surfaces. The influence of the film thickness h (50 less than or equal to h less than or equal to 3500 Angstrom) proves this dynamic uniaxiality involves rapid segment diffusion between both surfaces which impose a high degree of planar orientation. Thus the segmental ordering is observed over a thickness range which depends on the degree of chain entanglements.
引用
收藏
页码:233 / 237
页数:5
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