Side-chain liquid crystal polymers. A study by neutron diffraction of the backbone distribution profile in the smectic A phase
Side-chain liquid crystal polymers. A study by neutron diffraction of the backbone distribution profile in the smectic A phase
复制标题
侧链液晶聚合物。
DOI：
10.1080/02678299408027877
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发表时间：
1994
期刊：
影响因子：
--
通讯作者：
G. Pépy
中科院分区：
文献类型：
--
作者：
L. Noirez;P. Davidson;W. Schwarz;G. Pépy
摘要 通过近晶A相的中子衍射研究了两种介晶侧链聚甲基丙烯酸酯，称为PMA(R)OC4H9，唯一的区别在于其中一种在主链上被氘化(R = D)。它们各自的近晶反射强度之间的比较允许人们定量地推断出沿层法线的主干分布轮廓。随着温度降低，聚合物主链越来越多地与介晶核的亚层分离。然而，即使在室温下，仍有约 25% 的主链片段位于介晶核心亚层中。这些测量结果与之前确定的主链回转半径一起，详细描述了 PMAOC4H9 的主链如何受到近晶有序的影响。此外，还讨论了不同近晶反射强度随温度的演变。
Abstract Two mesomorphic side-chain polymethacrylates, called PMA(R)OC4H9, and only differing in the fact that one was deuteriated on the backbone (R = D) have been studied by neutron diffraction in the smectic A phase. The comparison between their respective smectic reflection intensities allows one to deduce quantitatively the backbone distribution profile along the normal to the layers. As the temperature decreases, the polymer backbones are more and more segregated from the sublayers of mesogenic cores. However, even at room temperature, there are still about 25 per cent of the backbone segments localized in the mesogenic core sublayers. These measurements, together with the previous determinations of the gyration radii of the backbones provide a detailed description of how the backbones of PMAOC4H9 are affected by the smectic ordering. In addition, the evolution with temperature of the different smectic reflection intensities is also discussed.