Crystalline structure of poly(decamethylene sebacate).: Repercussions on lamellar folding surfaces
Crystalline structure of poly(decamethylene sebacate).: Repercussions on lamellar folding surfaces
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DOI：
10.1021/ma011918t
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发表时间：
2002-04-23
期刊：
影响因子：
5.5
通讯作者：
Puiggalí, J
中科院分区：
文献类型：
--
作者：
Armelin, E;Almontassir, A;Puiggalí, J
用透射电镜和x射线衍射研究了聚癸二酸十亚甲基的晶体结构。聚合物表现出多态性，因为根据拉伸和退火条件可以得到对应于单斜晶胞和正交晶胞的纤维。第二种结构也可以在极性溶剂（如1-己醇）中通过溶液结晶得到。结合衍射数据和能量计算，对这种结构的分子堆积进行了详细的研究。单元胞含有两个链段，具有轻微扭曲的全反式构象和与聚乙烯相似的链设置角。两个链段沿链轴方向移动，因为它们之间有一个滑动面n。片层晶体被扇形分割，呈现出规则的折叠表面结构。从空间群对称性和表面装饰可以推导出由亚甲基和酯基构成的两种褶皱。
The crystalline structure of poly(decamethylene sebacate) has been studied using transmission electron microscopy and X-ray diffraction. The polymer shows polymorphism, since fibers corresponding to both monoclinic and orthorhombic unit cells can be obtained depending on the draw and annealing conditions. The second structure can also be obtained from solution crystallization in polar solvents such as 1-hexanol. Molecular packing of this structure has been studied in detail taking into account both diffraction data and energy calculations. The unit cell contains two chain segments with a slightly distorted all-trans conformation and a chain setting angle similar to that reported for polyethylene. The two chain segments are shifted along the chain axis direction, as they are related by a glide plane n. Lamellar crystals are sectorized and show a regular folding surface structure. Two kinds of folds, constituted by methylene or by ester groups, can be deduced from the space group symmetry and the surface decoration.