13C NMR spectra of nylon 6/12 copolymers and related model compounds

被引：16

作者：

Goodman, I ^{[1
]}

Maitland, DJ

Kehayoglou, AH

机构：

[1] Univ Bradford, Bradford BD7 1DP, W Yorkshire, England

[2] Aristotelian Univ Salonika, Lab Organ Chem Technol, GR-54006 Salonika, Greece

来源：

EUROPEAN POLYMER JOURNAL | 2000年 / 36卷 / 07期

关键词：

nylon; 6/12; copolymers; model compounds; chain structure; C-13 NMR spectroscopy;

D O I：

10.1016/S0014-3057(99)00194-9

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 C-13 NMR spectra of model mono- to tetra-amides containing CO, (CH2)(5) and (CH2)(11) groups in varied sequential arrangements have been used to reinterpret assignments previously proposed for signals in the spectra of nylon 6/12 random copolyamides. From the CO signal intensities, the mean nylon 6 and nylon 12 home-unit block lengths have been determined in copolyamides prepared by rapid (ca. 15 min) activated anionic lactam copolymerisation at 180 degrees C. The results are virtually identical with published data for equilibrium copolymers of similar co-unit ratios made by hydrolytic polymerisation at 260 degrees C in reaction times > 144 h. Maximum sequential randomness occurs at ca. 50-60 mol% nylon 6 component, coinciding with minima in the thermal and solid-state properties. (C) 2000 Elsevier Science Ltd. All rights reserved.

引用

页码：1301 / 1311

页数：11

共 20 条

[1]

ALEKSEEVA SG, 1981, VYSOKOMOL SOEDIN A+, V23, P1505

[2] POLYMERIZATION OF LACTAMS .45. THE C-13-NMR ANALYSIS OF COPOLYMERS OF 6-CAPROLACTAM WITH 12-DODECANELACTAM [J].