THERMAL-DEGRADATION OF POLYURETHANE FROM 1,4-BUTANEDIOL AND METHYLENE BIS(4-PHENYL ISOCYANATE)

被引:133
作者
GRASSIE, N
ZULFIQAR, M
机构
关键词
CHEMICAL ANALYSIS - MONOMERS - Chemistry - POLYMERIZATION - SPECTROSCOPIC ANALYSIS - THERMOANALYSIS;
D O I
10.1002/pol.1978.170160710
中图分类号
O63 [高分子化学(高聚物)];
学科分类号
070305 ; 080501 ; 081704 ;
摘要
Experimental data are presented which show that a polyurethane prepared from 1,4-butanediol (BD) and methylene bis(4-phenyl isocyanate) begins to evolve volatile degradation products at approximately 240 degree C. By a combination of thermal analysis methods (TVA, TG, and DSC) and examination of the volatile and involatile products by using a combination of GLC and infrared and mass spectrometric analysis, it is shown that the total reaction comprises a primary depoly-condensation process in which the two monomers are formed, followed by the subsequent reaction of these monomers to form the volatile products, tetrahydrofuran, dihydrofuran, carbon dioxide, water, butadiene, hydrogen cyanide, and carbon monoxide and residual carbodiimide and urea structures. A mechanism, which accounts for all these products, has been formulated and tested.
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页码:1563 / 1574
页数:12
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