聚四亚甲基碳酸酯和聚四甲基硫代碳酸酯的二维X射线衍射晶体结构对比研究  

A Comparative Study of 2-Dimensional X-ray Diffraction Crystal Structures of Poly(tetramethylene carbonate)and Poly(tetramethylene trithiocarbonate)

作　　者：王海 WANG Hai(Department of Polymer Materials and Engineering,School of Chemical Engineering,Dalian University of Technology,Dalian 116024,China)

机构地区：[1]大连理工大学化工学院高分子材料系,大连116024

出　　处：《高分子通报》2025年第4期659-665,共7页Polymer Bulletin

基　　金：国家自然科学基金(基金号22073015)。

摘　　要：以可降解的聚四亚甲基碳酸酯和聚四亚甲基三硫代碳酸酯为研究对象,通过二维X射线衍射和数据解析初步构建了二者的晶体结构。聚四亚甲基碳酸酯的晶胞参数为a=9.4Å,b=4.4Å,c=15.2Å,α=80°,β=98°,γ=90°,每个晶胞含有2条反向平行的分子链,单个晶胞含有4个单体,分子链属于P1组群,其中的4个亚甲基呈GT-G构象。聚四亚甲基三硫代碳酸酯的a=8.1Å,b=5.7Å,c=18.4Å,α=90°,β=85°,γ=105°,同样的每个晶胞含有2条反向平行的分子链,单个晶胞含有4个单体,分子链属于P1组群,不同的是聚四亚甲基三硫代碳酸酯分子链上的4个亚甲基呈现TTT构象。而分子链构象的不同可能是造成二者力学性能差异的原因之一。This paper focused on degradable poly(tetramethylene carbonate)and poly(tetramethylene trithiocarbonate).The primary crystal structures of the two polymers were built based on 2D-X-ray diffraction and data analyses.Poly(tetramethylene carbonate)has a unit cell of a=9.4Å,b=4.4Å,c=15.2Å,α=80°,β=98°,andγ=90°.There are two anti-paralleled chains packed in one unit cell that includes four monomers and with P1 space symmetry.The four methylenes in the repeat unit are in GT-G conformation.Poly(tetramethylene trithiocarbonate)has a unit cell of a=8.1Å,b=5.7Å,c=18.4Å,α=90°,β=85°,andγ=105°.Similarly,there are two anti-paralleled chains included in one unit cell with four monomers and P1 space symmetry.But the four methylenes of poly(tetramethylene trithiocarbonate)are in TTT conformation.The difference of chain conformation is probably one of the reasons that cause the diversity of the mechanical properties of the two polymers.

关 键 词：聚碳酸酯 聚硫代碳酸酯 晶体结构 二维X射线衍射 

分 类 号：TQ323.4[化学工程—合成树脂塑料工业]