高回弹氨纶的制备方法和研究

通过在预聚物溶液中再次添加定量的4,4-二苯基甲烷二异氰酸酯,制备出一种高回弹氨纶,研究证明,这种高回弹氨纶具有更加优良的回弹性能,解决了一些特殊领域对高回弹氨纶的要求。     

2,4-甲苯二异氰酸酯三聚反应

研究了不同终止剂对2,4-甲苯二异氰酸酯(TDI)三聚反应的终止效果,通过对异氰酸酯含量、粘度、分子量和红外光谱的测定,确定了制备二三聚环体含量高的TDI三聚体的优化工艺条件为：50℃下,催化剂DMP 30质量分数为0．05％,TDI和N,N-二甲基甲酰胺质量比为1：1,反应时间为80min。选择适当配方制成的聚氨酯漆包线漆,耐温性能有很大的提高。     

有机硅改性水性聚氨酯-丙烯酸酯乳液的制备及性能

采用种子乳液聚合方法合成了具有核壳结构的有机硅改性水性聚氨酯-丙烯酸酯复合乳液,TEM测试结果表明,该乳液具有核壳结构。通过共混与共聚体系衰减全反射红外光谱(ATR-FTIR)的比较及表面光电子能谱(ESCA)研究证实有机硅链段已被化学键入聚氨酯-丙烯酸酯分子链中,且硅氧烷链段有表面富集的倾向。表面水接触角及耐水性测试结果表明,随着有机硅含量的增加胶膜的水接触角增大,耐水性提高。     

填充用开孔聚氨酯硬泡组合料的研制

研制的填充用聚氨酯硬泡组合料，具有料液稳定、流动性好，所制泡沫泡孔均匀、开孔率高、不易收缩等特点。该组合料制得的泡沫性能为：泡沫密度15kg／m^3，开孔率大于98％，流动性大于1．3cm／g，压缩强度大于0．1MPa。     

新型矿用化学注浆材料的研制与应用

针对传统聚氨酯类加固材料反应热量和阻燃性限制其应用范围的缺陷,研制了一种反应热量低（最高温度为98℃）、阻燃等级高（无机材料与有机材料结合）、抗压强度高（大于40MPa）的新型注浆加固材料。通过在乌兰矿5767工作面应用效果表明,新型注浆加固材料有效控制了该工作面顶板破碎引起的冒顶和片帮现象,大幅提高工作面回采速度,保证了安全生产。     

泡沫塑料保温材料的研究进展

简述了国内外泡沫塑料保温材料的发展现状;介绍了聚氨酯泡沫塑料、聚苯乙烯泡沫塑料和酚醛泡沫塑料的研究进展;展望了泡沫塑料保温材料的应用前景和发展趋势。     

雷达波吸收性聚氨酯泡沫塑料的研究

通过对碳纤维、碳纤维/纤维Ⅰ和碳纤维/纤维Ⅱ分别填充的硬质聚氨酯泡沫塑料的吸波性能的研究,探讨了纤维类型、纤维含量、样品厚度的相关变化对塑料样板吸波性能的影响。结果表明,填充碳纤维的硬质聚氨酯泡沫塑料的吸波频带较窄;纤维Ⅰ和纤维Ⅱ分别与碳纤维混杂均可展宽频带;吸波性能随塑料样板厚度的增加而增强,随纤维Ⅱ含量的增加,吸收峰向低频移动,峰值增大。     

斜坡辊道圆弧段的设计应用

通过设计参数的计算,对斜坡输送辊道进行了全面的论述与分析,认为合理选择凸弧与凹弧的曲率半径对斜坡 输送辊道尤为重要.     

玻璃纤维填充聚氨酯改性环氧树脂灌封材料的性能

采用真空灌注工艺,以磨碎玻璃纤维(MG)为填料,通过聚氨酯(PU)对4,5环氧环己烷1,2-二甲酸二缩水甘油酯(TDE-85)、四氢邻苯二甲酸二缩水甘油酯(711)、二酚基丙烷环氧树脂(E-51)改性,研究了MG/PU/TDE-85灌封材料、MG/PU/711灌封材料及MG/PU/E-51灌封材料的力学性能、热性能和电性能。研究结果表明,MG/PU/TDE-85灌封材料的拉伸强度、冲击强度、玻璃化转变温度、体积电阻率均为最大,分别达到79.72MPa、17.83kJ/m2、144℃和2.78×1015Ω.cm,具有最佳的综合性能。     

A smart hollow filament with thermal sensitive internal diameter

In this work, a thermoplastic shape memory polyurethane was prepared via melt polymerization and a corresponding shape memory hollow fiber was fabricated via melt spinning. The fiber mechanical properties, especially shape memory effect, were characterized by static tensile, thermo‐mechanical cyclic tensile testing. The hollow fiber switching temperature was the melting transition temperature of the soft segment phase at about 41°C. The tenacity of the hollow fiber was about 1.14 cN/dtex, and breaking elongation was 682%. The shape fixity ratio was above 87% and the recovery ratio was above 89%. The internal diameter of the hollow fiber could be noticeably changed and the deformed fiber cross‐section could be well fixed. Once heated above the soft segment phase melting transition temperature, the hollow fiber internal hole recovered to its original diameter. The results from differential scanning calorimetry, X‐ray diffraction, and dynamic mechanical analysis were used to illustrate the mechanism governing the mechanical properties and shape memory effect especially. Due to the changes of the hollow fiber and the internal diameter affect of the physical properties of the prepared products, this fiber may be used in smart textiles for thermal management, or as stuffing of pillows and mattresses, which can adjust to body contours. Furthermore, the findings suggest that this kind of hollow fiber with thermal sensitive internal diameter could be used in smart filtration, drug‐controlled release, and liquid transportation in vivo. © 2009 Wiley Periodicals, Inc. J Appl Polym Sci, 2009