STRUCTURAL STUDY OF SYNDIOTACTIC POLYSTYRENE .1. POLYMORPHISM

被引：198

作者：

CHATANI, Y ^{[1
]}

SHIMANE, Y ^{[1
]}

INOUE, Y ^{[1
]}

INAGAKI, T ^{[1
]}

ISHIOKA, T ^{[1
]}

IJITSU, T ^{[1
]}

YUKINARI, T ^{[1
]}

机构：

[1] IDEMITSU KOSAN CO LTD,CENT RES LABS,CHIBA 29902,JAPAN

来源：

POLYMER | 1992年 / 33卷 / 03期

关键词：

SYNDIOTACTIC POLYSTYRENE; POLYMORPHISM; MOLECULAR COMPOUND; X-RAY DIFFRACTION; THERMAL ANALYSIS;

D O I：

10.1016/0032-3861(92)90723-A

中图分类号：

O63 [高分子化学（高聚物）];

学科分类号：

070305 ; 080501 ; 081704 ;

摘要：

The features of the crystallization of syndiotactic polystyrene were investigated by X-ray diffraction, differential thermal analysis, thermogravimetry and density measurements. This polymer exhibits polymorphism: there are principally four distinct crystalline phases. Melt-crystallization yields a planar zigzag form. As-cast samples from solutions with a variety of solvents are molecular compounds with the solvents used, in which the polymer chains assume a twofold helical conformation of type (TTGG)2. On annealing the molecular compounds at moderate temperatures below approximately 130-degrees-C, they are transformed in common, by removal of the solvent molecules, to a (TTGG)2 twofold helical form free from solvents. On annealing at higher temperatures, the helical form is transformed to a planar zigzag form, which is distinguished from the melt-crystallized planar zigzag form in terms of the mode of molecular arrangement.

引用

页码：488 / 492

页数：5

共 12 条

[1] CRYSTAL-STRUCTURE OF THE PLANAR ZIGZAG FORM OF SYNDIOTACTIC POLYPROPYLENE [J].