共查询到20条相似文献,搜索用时 122 毫秒
1.
2.
丙烯酸树脂改性的水性聚氨酯耐化学性研究 总被引:2,自引:0,他引:2
研究了以不同方式改性的水性聚氨酯的耐化学性。试验结果表明,物理和化学改性均可提高水性聚氨酯的耐水性、耐甲基性及耐下酮性;仅以聚氨酯、丙烯酸树脂之间形成化学键的常规化学改性无助于改善聚氨酯的耐碱性;而以核-壳共聚的化学改性则可提高聚氨酯的碱性。 相似文献
3.
水性聚氨酯化学改性研究进展 总被引:3,自引:0,他引:3
介绍了几种水性聚氨酯化学改性的研究进展,包括环氧树脂、丙烯酸树脂、有机硅氧烷等二元共聚改性及两种以上树脂的三元共聚改性的研究状况.展望了水性聚氨酯化学改性的发展趋势. 相似文献
4.
5.
6.
7.
8.
硅氧烷化学改性水性聚氨酯研究进展 总被引:3,自引:0,他引:3
综述了硅氧烷化学改性水性聚氨酯的几种方法,其中包括羟基聚硅氧烷、氨基聚硅氧烷、环氧硅氧烷和硅氧烷-乙烯基多元改性。介绍了各类改性方法的反应过程及其研究现状,指出硅氧烷改性水性聚氨酯技术进一步发展的方向。 相似文献
9.
10.
11.
12.
13.
14.
The molecular design of semi‐inorganic polymers has produced polysilphenylene–siloxane and polyphosphazene elastomers having comparable fire safety to heat resistant engineering plastics. In flaming combustion a polyphosphazene rubber had a four times lower peak heat release rate than the polyurethane elastomer currently used in fire‐blocked aircraft seat cushions. The addition of expandable graphite flakes to polyurethane and polyphosphazene elastomers reduces their peak heat release rates by factors of seven and five, respectively. Published in 2003 by John Wiley & Sons, Ltd. 相似文献
15.
综述了医用聚氨酯材料在人工心脏、人造血管、矫形绷带、粘合剂、人工皮肤、药物载体等领域的研究进展,指出今后医用聚氨酯材料的发展方向是可生物降解,具有形状记忆功能,可应用于组织工程,具有高生物相容性和抗菌性等。 相似文献
16.
17.
The auhtors report 3D biomimetic scaffolds using polymer blend of polyurethane and cellulose for cardiac tissue engineering. The biocompatible and biodegradable polyurethane is designed, synthesized and characterized. By incorporating 10 wt% of naturally ordered cellulose into the polyurethane and electrospinning them into 3D scaffold, the scaffold exhibits good biocompatibility and mechanical property to support and accommodate constant cycles of contraction/expansion of cardiac tissue. The biocompatibility is further improved using scaffold fabricated from aligned fibers due to synergistic effects between cells and ordered macromolecules. The anisotropic structured scaffold is mimicked the extracellular matrix and has therapeutic potential in reconstruction of damaged myocardium. 相似文献
18.
R. E. Whittaker 《应用聚合物科学杂志》1971,15(5):1205-1218
The mechanical behavior of microporous polyurethane foams used in poromeric materials can be described by use of a model comprising of struts of square cross section arranged in a cubical lattice. The model was initially proposed by Gent and Thomas to describe the properties exhibited by natural rubber latex foams. The microporous polyurethane foams used in poromerics are in general much stronger than natural rubber foams, and it has been found that their tear and tensile properties are dependent on the size of the largest pore, which can be up to 20 times greater in diameter than the average pore size. The behavior of the polyurethane foam in compression can be satisfactorily described by use of this cubical model and shape factor theories from polymer engineering. 相似文献
19.