SUBSTITUENT EFFECTS IN THE C-13 NMR-SPECTRA OF ARYL ETHER COPOLYMERS .5. ARYL ETHER KETONE COPOLYMERS IN ACID-SOLUTION

被引：16

作者：

ABRAHAM, RJ ^{[1
]}

HAWORTH, IS ^{[1
]}

BUNN, A ^{[1
]}

HEARMON, RA ^{[1
]}

机构：

[1] ICI WILTON MAT CTR,MIDDLESBROUGH TS6 8JE,ENGLAND

来源：

POLYMER | 1990年 / 31卷 / 04期

关键词：

!sup]13[!/sup]C n.m.r; acid solution; aryl ether ketone; copolymer; long range effects;

D O I：

10.1016/0032-3861(90)90296-B

中图分类号：

O63 [高分子化学（高聚物）];

学科分类号：

070305 ; 080501 ; 081704 ;

摘要：

Complete assignments have been made for the quaternary carbon signals in the acid solution 13C n.m.r. spectra of three statistical copolymers of the aryl ether ketone unit with aryl ether ether ketone (EK/EEK), aryl ether ketone ketone (EK/EKK) and aryl ether sulphone (EK/ES). These signals are extremely sensitive to sequencing information and the spectra obtained can only be explained by considering functionality variation up to six rings removed from the observed carbon atom, C*. The transmission medium for these long range effects is the π electron system of the chain, as evidenced by the enhanced effects if the chain through which they are transmitted consists of alternating ether and ketone bridges, the most efficiently conjugated system. The effects are removed or diminished by insertion of other functionalities and there is also a correlation between the absolute chemical shift of C* and the size of splitting and amount of fine structure observed. © 1990.

引用

页码：728 / 735

页数：8

共 16 条

[1] SUBSTITUENT EFFECTS IN THE C-13 NUCLEAR MAGNETIC-RESONANCE SPECTRA OF ARYL ETHER COPOLYMERS .2. ETHER SULFONE ETHER ETHER SULFONE AND ETHER SULFONE ETHER KETONE COPOLYMERS IN DEUTERATED DIMETHYLSULFOXIDE [J].