Phase transition in the surface structure in copolymer films of vinylidene fluoride (70%) with trifluoroethylene (30%)
Phase transition in the surface structure in copolymer films of vinylidene fluoride (70%) with trifluoroethylene (30%)
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DOI：
10.1103/physrevb.61.5760
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发表时间：
2000-02-15
影响因子：
3.7
通讯作者：
Yudin, SG
中科院分区：
文献类型：
--
作者：
Choi, J;Borca, CN;Yudin, SG
表面结构和表面结构相变不同于已知的偏氟乙烯(70%)和三氟乙烯(30%)结晶共聚物膜的铁电-顺电相变。表面结构随温度的变化伴随着极性基团(CH2-CF2)的物理旋转。表面结构的这些变化与体相变进行了比较。我们发现，在厚的和薄的朗缪尔-布洛吉特生长的薄膜中，体相结构的转变虽然不同于表面，但在性质上是相似的。
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.