Synthesis and Properties of Polymers from Monosubstituted Acetylene Derivatives Bearing Ferroelectric Liquid Crystalline Groups
Synthesis and Properties of Polymers from Monosubstituted Acetylene Derivatives Bearing Ferroelectric Liquid Crystalline Groups
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DOI：
10.1021/ma035765g
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发表时间：
2004-05
期刊：
影响因子：
5.5
通讯作者：
H. Goto;X. Dai;T. Ueoka;K. Akagi
中科院分区：
文献类型：
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作者：
H. Goto;X. Dai;T. Ueoka;K. Akagi
新型液晶聚乙炔衍生物是一种新型的液晶共轭聚合物，具有对电场的快速响应。在实践中，我们通过在聚乙炔侧链上引入含氟手性液晶基团，合成了铁电液晶共轭聚合物。用差示扫描量热法和偏光显微镜研究了聚合物的相变行为。用X-射线衍射测量评价了酶以及更高级的结构。合成的聚合物在加热和冷却过程中显示出手性近晶相（N*）、扭曲晶界近晶A相（TGBA*）和手性近晶相（SmC*）。SmC* 相的观察使我们能够预期聚合物应该表现出铁电性。
Novel liquid crystalline polyacetylene derivatives were developed as advanced LC conjugated polymers with quick response to an electric field used as external force. In practice, we synthesized ferroelectric LC conjugated polymers by introducing fluorine-containing chiral LC groups into side chains of polyacetylenes. Phase-transition behaviors of these polymers were examined by differential scanning calorimetry and polarizing optical microscopy. Mesophases as well as higher order structures were evaluated with X-ray diffraction measurements. The polymers synthesized showed chiral nematic (N*), twist grain boundary smectic A (TGBA*), and chiral smectic (SmC*) phases in the heating and cooling processes. Observation of the SmC* phase allows us to expect that the polymer should exhibit ferroelectricity.