共查询到18条相似文献,搜索用时 125 毫秒
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综述了超分子聚氨酯的合成方法,利用氢键相互作用、电子供体-受体相互作用、离子相互作用等分子间非共价键的键合作用而制得超分子聚氨酯,并介绍了超分子聚氨酯主要在液晶材料、涂层材料、形状记忆材料的应用。 相似文献
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本文介绍了2,2-二羟甲基丙酸的合成方法及其作为水乳型聚氨酯的扩链剂、聚酯树脂的添加剂和制备光敏树脂,液晶的原料等方面的应用。 相似文献
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以1,4-双(对羟基烷氧基苯甲酸)苯酯分别与2,4-甲苯二异氰乙酸酯(2,4-TDI)、二苯甲烷-4,4’-二异氰酸酯(MDI)反应制得聚氨酯。运用差热扫描量热分析仪(DSC)、偏光显微镜(POM)对其进行了表征。结果表明,合成的聚氨酯产物在一定温度范围内均为热致性向列型液晶体,其转变温度随着间隔基柔顺性的增加呈下降趋势。 相似文献
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聚氨酯密封胶国外研究进展 总被引:4,自引:0,他引:4
介绍了国外在提高聚氨酯密封胶固化性、粘接性、弹性及耐候性等性能方面的研究成果 ,内容涉及单组分湿固化密封胶 (含硅烷改性单组分胶 )及普通双组分密封胶、含多硫化物的双组分聚氨酯密封胶 相似文献
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J. G hde R. Mix R. -P. Krü ger H. Goering W. Funke U. Hermann 《The Journal of Adhesion》1996,58(3):243-251
Linear liquid crystalline polyurethane (LC-PU) were synthesized by the reaction of 2,4-toluene diisocyanate (TDI), 4,4'-bis-(6-hydroxyhexoxy)biphenyl (BHHBP), and poly(butylene adipate) (PBA). The BHHBP as mesogenic unit was incorporated into the hard segment formed by the reaction with the TDI. The hard segments are incompatible with the PBA soft segments. The mesomorphic behaviour is influenced by both the soft segment length and the hard segment concentration.
The adhesion of such polyurethanes used as primer in composites based on steel as substrate and alkyd melamine resin as coating is dependent on the polyurethane structure, the thickness of the polyurethane layer and its drying conditions. The highest wet adhesion stability is achieved by the hard-segment-type polyurethane composed of TDI and the mesogenic unity BHHBP. Partial substitution of BHHBP by 2,2-bis-(hydroxymethyl)propionic acid (BHMPA) in this LC polyurethane enhances the effectiveness of the primer. 相似文献
The adhesion of such polyurethanes used as primer in composites based on steel as substrate and alkyd melamine resin as coating is dependent on the polyurethane structure, the thickness of the polyurethane layer and its drying conditions. The highest wet adhesion stability is achieved by the hard-segment-type polyurethane composed of TDI and the mesogenic unity BHHBP. Partial substitution of BHHBP by 2,2-bis-(hydroxymethyl)propionic acid (BHMPA) in this LC polyurethane enhances the effectiveness of the primer. 相似文献