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首页> 外文期刊>Journal of Applied Polymer Science >Properties of crosslinked polyurethanes synthesized from 4,4 '-diphenylmethane diisocyanate and polyester polyol
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Properties of crosslinked polyurethanes synthesized from 4,4 '-diphenylmethane diisocyanate and polyester polyol

机译：4,4'-二苯基甲烷二异氰酸酯与聚酯多元醇合成的交联聚氨酯的性能

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摘要

Polyurethanes were synthesized using the high functional 4,4'-diphenylmethane diisocyanate (MDI), polyester polyol, and 1,4-butane diol. The synthesized polyurethanes were analyzed using differential scanning calorimeter (DSC), dynamic mechanical thermal analysis (DMTA), Fourier transform infrared (FTIR) spectrometer, and swelling measurement using N,N'-dimethylformamide. From the result of thermal analysis by DSC and DMTA, single T(g)s were observed in the polyurethane samples at all the formulated compositions. From this result, it is suggested that the polyurethanes synthesized in this study have crosslinked structure rather than the phase-separated segmented structure because of the high functionality (f = 2.9) of the MDI. By annealing the polyurethane samples using DSC, the T(g)s were increased by 4.7 similar to 16.0 degrees C at the various annealing temperatures. From the results of FTIR and swelling measurement of polyurethanes, it is suggested that the increase of T-g of the polyurethanes by annealing is not due to increase of the hydrogen bond strength but mainly due to the increase of the crosslink density. (C) 2000 John Wiley & Sons, Inc. [References: 25]
机译：聚氨酯是使用高官能度的4,4'-二苯基甲烷二异氰酸酯（MDI），聚酯多元醇和1,4-丁二醇合成的。使用差示扫描量热仪（DSC），动态机械热分析（DMTA），傅立叶变换红外（FTIR）光谱仪和使用N，N'-二甲基甲酰胺进行溶胀测量来分析合成的聚氨酯。根据DSC和DMTA的热分析结果，在所有配制的组合物中，聚氨酯样品中均观察到单个T（g）。从该结果可以看出，由于MDI的高官能度（f = 2.9），本研究中合成的聚氨酯具有交联结构，而不是相分离的链段结构。通过使用DSC对聚氨酯样品进行退火，在各种退火温度下，T（g）均增加了4.7，类似于16.0摄氏度。根据FTIR的结果和聚氨酯的溶胀测量，表明通过退火的聚氨酯的T-g的增加不是由于氢键强度的增加而是主要是由于交联密度的增加。 （C）2000 John Wiley＆Sons，Inc. [参考：25]

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