STRUCTURAL STUDY ON SYNDIOTACTIC POLYSTYRENE .2. CRYSTAL-STRUCTURE OF MOLECULAR-COMPOUND WITH TOLUENE
STRUCTURAL STUDY ON SYNDIOTACTIC POLYSTYRENE .2. CRYSTAL-STRUCTURE OF MOLECULAR-COMPOUND WITH TOLUENE
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DOI：
10.1016/0032-3861(93)90318-5
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发表时间：
1993-01-01
期刊：
影响因子：
4.6
通讯作者：
SHIKUMA, H
中科院分区：
文献类型：
--
作者：
CHATANI, Y;SHIMANE, Y;SHIKUMA, H
用X-射线衍射法研究了间规聚苯乙烯-甲苯分子化合物的晶体结构。晶体结构为：单斜晶系，空间群P2(1)/a(14号)，a=17.58，b=13.26，c(链轴)=7.71埃，伽马=121.2度，8个单体单元(2个链)，每个单胞有2个甲苯分子，单体与甲苯的摩尔比为4：1。高分子链具有(-TGG-)2构象的双螺旋结构，高分子链的堆积使每个甲苯分子占据相邻高分子链的苯环之间的一个孤立的空穴。苯、氯苯、对二甲苯、1，2，4-三氯苯等分子化合物与甲苯分子化合物同构。这些分子化合物通常在120至150摄氏度之间加热时转变为另一种不受客体影响的晶相，其中聚合物链保持螺旋结构。
The crystal structure of the syndiotactic polystyrene-toluene molecular compound was studied by X-ray diffraction. The crystal data are as follows: monoclinic system, space group P2(1)/a (no. 14), a = 17.58, b = 13.26, c(chain axis) = 7.71 angstrom, gamma = 121.2-degrees, eight monomer units (two chains) and two toluene molecules per unit cell, the molar ratio of monomer: toluene being 4:1. The polymer chains take a twofold helical structure of (-TTGG-)2 conformation, and the packing of the polymer chains enables each toluene molecule to occupy an isolated hole between the benzene rings of adjacent polymer chains. The molecular compounds with benzene, chlorobenzene, p-xylene, 1,2,4-trichlorobenzene and so on are isomorphous to the toluene molecular compound. These molecular compounds are commonly transformed on heating between 120 and 150-degrees-C to another crystalline phase free from the guests, in which the polymer chains retain the helical structure.