Muresan A S, Ostrovskii B I, Sánchez-Ferrer A, Finkelmann H, de Jeu W H
FOM Institute for Atomic and Molecular Physics, Kruislaan 407, 1098 SJ, Amsterdam, The Netherlands.
Eur Phys J E Soft Matter. 2006 Apr;19(4):385-8. doi: 10.1140/epje/i2005-10077-7. Epub 2006 Apr 3.
We report a high-resolution X-ray lineshape study of main-chain smectic polymers. The results indicate that the layer ordering differs fundamentally from the algebraic decay typical for other smectic liquid-crystalline systems. The lineshapes are best described by broad squared Lorentzians indicating some form of short-range correlations. However, several higher harmonics are observed, which excludes simple liquid-like short-range order. This behaviour is tentatively attributed to a random field of defects associated with entangled hairpins in the main-chain polymer structure.
我们报告了一项关于主链近晶聚合物的高分辨率X射线线形研究。结果表明，层序与其他近晶液晶系统典型的代数衰减有根本区别。线形最好用宽平方洛伦兹函数来描述，这表明存在某种形式的短程相关性。然而，观察到了几个高次谐波，这排除了简单的类液体短程有序。这种行为初步归因于与主链聚合物结构中缠结的发夹相关的缺陷随机场。
