Crystal and Molecular Structures of Poly(1,4-phenylenesulfone) and Its Trisulfone and Tetrasulfone Oligomers
作者:Howard M. Colquhoun、Peter L. Aldred、Franz H. Kohnke、Penelope L. Herbertson、Ian Baxter、David J. Williams
DOI:10.1021/ma011597l
日期:2002.2.1
4-phenylene), and its tetrasulfone oligomer ArSO2ArSO2ArSO2ArSO2Ar (Ar = phenyl or 1,4-phenylene) have been determined from X-ray powder diffraction data interfaced to molecular simulation and diffraction modeling. An initial model for the tetrasulfone oligomer was developed using conformational and packing information obtained from a single-crystal X-ray determination of the structure of the trisulfone
聚(1,4-亚苯基砜),[1,4-ArSO 2 ] n(Ar = 1,4-亚苯基)及其四砜低聚物的结构ArSO 2 ArSO 2 ArSO 2 ArSO 2 ArSO 2 Ar(Ar =苯基或1 (4-亚苯基)已从与分子模拟和衍射建模相关的X射线粉末衍射数据中确定。使用通过单晶X射线测定三砜ArSO 2 ArSO 2 ArSO 2的结构获得的构象和堆积信息,开发了四砜低聚物的初始模型。Ar,其中芳族环平面基本上正交于由桥连的CS基团限定的平面。通过Pawley和Rietveld方法对四砜结构进行能量最小化和晶体学精炼,得到了15.3%的相合因数(R wp)。类似的方法导致了对聚(1,4-亚苯基砜)(R wp = 5.5%)。在所有三个结构中,二芳基砜单元采用接近完美的开本构型,并且分子结晶时,横向相邻链的芳环基本平行。聚合物晶胞为C中心正交晶(每个晶胞两条链),空间群Cmcm,a = 10