共查询到20条相似文献,搜索用时 93 毫秒
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采用聚氨酯改性自催化醇酸树脂,氨基树脂,助剂,溶剂等制成聚氨酯改性醇酸氨基漆。介绍了聚氨酯改性自催化醇酸树脂的生产工艺、漆的制备及性能,讨论了各种影响因素。 相似文献
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有机硅改性聚氨酯的研究进展 总被引:1,自引:0,他引:1
有机硅改性聚氨酯聚合物是一类很有应用前景的性能优异的新型高分子材料。综述了有机硅改性聚氨酯的合成方法,结构特点和性能,探讨了相分离及其对材料的影响和增加相容性的途径,并简要介绍了其应用。 相似文献
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热塑性聚氨酯与聚氯乙烯共混研究进展 总被引:5,自引:1,他引:5
综述了热塑性聚氨酯与聚氯乙烯共混改性研究进展,重点介绍了热塑性聚氨酯与聚氯乙烯共混物的相容性、共混方式、热塑性聚氨酯的类型和组分、助剂和第三组分聚合物等对共混物性能的影响及其应用。 相似文献
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The structure‐property relationship of L ‐tyrosine‐based polyurethanes was demonstrated by using different polyols and diisocyanates. L ‐tyrosine‐based chain extender, desaminotyrosyl tyrosine hexyl ester (DTH), was used to synthesize a series of polyurethanes. Polyethylene glycol (PEG) or poly caprolactone diol (PCL) was used as the soft segment and hexamethylene diisocyanate (HDI) or dicyclohexylmethane 4,4′‐diisocyanate (HMDI) was used with DTH as the hard segment. The polyurethanes were characterized to investigate the effect of structure on different polyurethane properties. From FTIR and DSC, these polyurethanes exhibit a wide range of morphology from phase‐mixed to phase‐separated structure. The decreasing molecular weight of the PEG soft segment leads to relatively more phase mixed morphology whereas for PCL‐based polyurethanes the extent of phase mixing is less with decreasing PCL molecular weight. Results show that PCL‐based polyurethanes are mechanically stronger than PEG‐based polyurethanes but PCL‐based polyurethanes degrade slower and absorb less water compared with PEG‐based polyurethanes. The HMDI‐based polyurethanes are less crystalline and comparatively more hydrophobic than HDI‐based polyurethanes. The characterization results show that the polyurethane properties are directly related to the structure and can be varied easily for a different set of properties that are pertinent for biomaterial applications. © 2008 Wiley Periodicals, Inc. J Appl Polym Sci, 2008 相似文献
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