SOLID-STATE C-13 NUCLEAR MAGNETIC-RESONANCE SPECTRA OF THE ALPHA-CONFORMERS AND BETA-CONFORMERS OF TRANS-1,4-POLYISOPRENE

被引：8

作者：

PATTERSON, DJ ^{[1
]}

KOENIG, JL ^{[1
]}

机构：

[1] CASE WESTERN RESERVE UNIV,DEPT MACROMOLEC SCI,CLEVELAND,OH 44106

来源：

POLYMER | 1988年 / 29卷 / 02期

关键词：

NUCLEAR MAGNETIC RESONANCE - RUBBER - Spectroscopic Analysis;

D O I：

10.1016/0032-3861(88)90328-X

中图分类号：

O63 [高分子化学（高聚物）];

学科分类号：

070305 ; 080501 ; 081704 ;

摘要：

Solid-state **1**3C nuclear magnetic resonance (nmr) was used to study the two different conformers of trans natural rubber (NR). The alpha and beta conformers of trans NR were observed to give different **1**3C chemical shifts. The relative magnitude and direction of the chemical shift for the methyl carbon on the beta conformer are predicted by a steric perturbation model. The alpha conformer gave longer relaxation times than the beta conformer. For this highly mobile semicrystalline polymer, spin diffusion was not a major contributer to the relaxation process.

引用

页码：240 / 244

页数：5

共 25 条

[1]

ANADAKUMARAN K, 1982, J POLYM SCI PP, V20, P1669

[2]

ANDREW ER, 1972, PROGR NMR SPECTROSCO, V8, P1

[3] An apparatus for obtaining high speeds of rotation [J].

Beams, JW .

REVIEW OF SCIENTIFIC INSTRUMENTS, 1930, 1 (11) :667-671

[4] THEORY OF LINE NARROWING BY DOUBLE-FREQUENCY IRRADIATION [J].

BLOCH, F .

PHYSICAL REVIEW, 1958, 111 (03) :841-853

[5] SOLID-STATE HIGH-RESOLUTION C-13 NMR-SPECTRA OF POLYPROPENE [J].

BUNN, A ;

CUDBY, MEA ;

HARRIS, RK ;

PACKER, KJ ;

SAY, BJ .

JOURNAL OF THE CHEMICAL SOCIETY-CHEMICAL COMMUNICATIONS, 1981, (01) :15-16

[6] Molecular structure and rubber-like elasticity I. The crystal structures of beta gutta-percha, rubber and polychloroprene [J].

Bunn, CW .

PROCEEDINGS OF THE ROYAL SOCIETY OF LONDON SERIES A-MATHEMATICAL AND PHYSICAL SCIENCES, 1942, 180 (A980) :0040-0066

[7] CRYSTALLIZATION OF GUTTA PERCHA AND SYNTHETIC TRANS-1,4-POLYISOPRENES [J].

COOPER, W ;

VAUGHAN, G .

POLYMER, 1963, 4 (03) :329-340

[8]

Duch MW., 1970, MACROMOLECULES, V3, P165, DOI [10.1021/ma60014a010, DOI 10.1021/MA60014A010]

[9] OBSERVATIONS IN SOLID POLYETHYLENES BY C-13 NUCLEAR MAGNETIC-RESONANCE WITH MAGIC ANGLE SAMPLE SPINNING [J].

EARL, WL ;

VANDERHART, DL .

MACROMOLECULES, 1979, 12 (04) :762-767

[10] IDENTIFICATION OF RATES AND AMPLITUDES OF MACROMOLECULAR MOTIONS IN CIS-1,4-POLYBUTADIENE WITH COHERENT AVERAGING METHODS [J].

ENGLISH, AD ;

DYBOWSKI, CR .

MACROMOLECULES, 1984, 17 (03) :446-449

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