C-13 AND N-15 CP/MAS NMR CHARACTERIZATION OF MDI-POLYISOCYANURATE RESIN SYSTEMS

被引：33

作者：

DUFF, DW ^{[1
]}

MACIEL, GE ^{[1
]}

机构：

[1] COLORADO STATE UNIV,DEPT CHEM,FT COLLINS,CO 80523

来源：

MACROMOLECULES | 1990年 / 23卷 / 12期

关键词：

D O I：

10.1021/ma00214a008

中图分类号：

O63 [高分子化学（高聚物）];

学科分类号：

070305 ; 080501 ; 081704 ;

摘要：

A series of MDI-polyisocyanurate resins were prepared under a variety of reaction conditions from 4,4′-methylenebis(phenylisocyanate) (MDI) and from15N-enriched MDI, using stannous octoate as catalyst. The formation of cross-links via isocyanurate ring formation and the fate of the unreacted isocyanate were monitored by both13C and15N CP/MAS NMR methods, and an optimal cure temperature of ca. 120 °C was determined for this particular system. Urea linkages and other less predominant structures such as amine, biuret, and uretidione were clearly identified by15N CP/MAS. The ability of15N CP/MAS to yield quantitative results on the extent of cross-linking is demonstrated.15N CP/MAS proves to be a powerful technique for structure elucidation in these complex macromolecular systems. © 1990, American Chemical Society. All rights reserved.

引用

页码：3069 / 3079

页数：11

共 46 条

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