HIGH-RESOLUTION SOLID-STATE C-13 NMR-STUDY OF ISOTACTIC POLYPROPYLENES ISOTHERMALLY CRYSTALLIZED FROM THE MELT

被引：60

作者：

SAITO, S ^{[1
]}

MOTEKI, Y ^{[1
]}

NAKAGAWA, M ^{[1
]}

HORII, F ^{[1
]}

KITAMARU, R ^{[1
]}

机构：

[1] KYOTO UNIV,INST CHEM RES,UJI,KYOTO 611,JAPAN

来源：

MACROMOLECULES | 1990年 / 23卷 / 13期

关键词：

D O I：

10.1021/ma00215a010

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 phase structure of isotactic polypropylenes isothermally crystallized from the melt has been examined at different temperatures by solid-state high-resolution13C NMR spectroscopy using VT/MAS (variable temperature/magic angle spinning). On the basis of13C spin-lattice relaxation and computer line-shape analyses, it has been found that polypropylene samples are composed of not only crystalline and amorphous components but also another noncrystalline component with 31-helical conformation. Similar NMR analyses at different temperatures have revealed that a reversible structural change between the 31-helical and random conformations occurs in the noncrystalline region at 60-110 °C. © 1990, American Chemical Society. All rights reserved.

引用

页码：3256 / 3260

页数：5

共 20 条

[1] CONFORMATION OF CYCLIC PARAFFINS AND POLYETHYLENE IN THE SOLID-STATE AS STUDIED BY C-13 CP MAS NMR [J].