Reversible helix-helix transition of poly(beta-phenylpropyl L-aspartate) involving a screw-sense inversion in the solid state

被引：97

作者：

Watanabe, J ^{[1
]}

Okamoto, S ^{[1
]}

Satoh, K ^{[1
]}

Sakajiri, K ^{[1
]}

Furuya, H ^{[1
]}

Abe, A ^{[1
]}

机构：

[1] TOKYO INST POLYTECH,DEPT IND CHEM,ATSUGI,KANAGAWA 24302,JAPAN

来源：

MACROMOLECULES | 1996年 / 29卷 / 22期

关键词：

D O I：

10.1021/ma9605964

中图分类号：

O63 [高分子化学（高聚物）];

学科分类号：

070305 ; 080501 ; 081704 ;

摘要：

Poly(beta-phenylpropyl L-aspartate) exhibits a novel helix-helix transition in the solid state at around 160 degrees C. The transition takes place reversibly in a narrow temperature range during a heating and cooling cycle, indicating that it is essentially of a first order. A combined use of circular dichroism, X-ray, and C-13 CP/MAS NMR measurements revealed that the transition is due to an interconversion of the helical screw sense from a right-handed alpha-helix to a left-handed helix. An unwinding and rewinding of the helical screw occurs concertedly along the polypeptide backbone without disturbing the uniaxial orientation of the helix axes.

引用

页码：7084 / 7088

页数：5

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