Phase transition in the surface structure in copolymer films of vinylidene fluoride (70%) with trifluoroethylene (30%)

被引:109
作者
Choi, J [1 ]
Borca, CN
Dowben, PA
Bune, A
Poulsen, M
Pebley, S
Adenwalla, S
Ducharme, S
Robertson, L
Fridkin, VM
Palto, SP
Petukhova, NN
Yudin, SG
机构
[1] Univ Nebraska, Ctr Mat Res & Anal, Behlen Lab Phys, Dept Phys & Astron, Lincoln, NE 68588 USA
[2] Oak Ridge Natl Lab, HFIR, Oak Ridge, TN 37831 USA
[3] Russian Acad Sci, Inst Crystallog, Moscow 117333, Russia
来源
PHYSICAL REVIEW B | 2000年 / 61卷 / 08期
关键词
D O I
10.1103/PhysRevB.61.5760
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
Surface structures and a surface structure phase transition are identified that are distinct from the known bulk ferroelectric-paraelectric phase transition of crystalline copolymer films of vinylidene fluoride (70%) with trifluoroethylene (30%). The temperature-dependent changes in the surface structure are accompanied by the physical rotation of the polar group (CH2-CF2). These changes in the surface structure are compared to the bulk phase transition. We show that the bulk structural transition, while distinct from the surface, is qualitatively similar in both thick and thin Langmuir-Blodgett-grown films.
引用
收藏
页码:5760 / 5770
页数:11
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