水利血防工程中生态抑螺护岸设计与应用初探

传统的水利血防工程采用硬质护岸形式,极大程度地影响了河道生物多样性。依托某水利血防工程,在对河道附近水位站潮位资料统计排频的基础上,给出了常规硬质护岸的设计方案。结合植物抑螺理念,设计出一种生态型的抑螺护岸。并将不同抑螺植物组合设置成三个生态抑螺护岸试验段。通过现场调查比较,硬质护岸和生态抑螺护岸都能起到灭螺效果,相对于硬质护岸河流景观单一化,生态抑螺护岸更贴近自然,三个生态护岸试验区中,以密毛酸模叶蓼为挺水植物,以益母草为草本植物的实验段植物存活率更高。     

两种聚氨酯防水涂料的比较

对焦油型和非焦油水固化型聚氨酯防水涂料B组分的生产工艺、配方特点，施工操作工艺、固化时间、涂膜性能等方面进行了比较，指出新开发的非焦油型聚氨酯涂料生产周期短、能耗少、气味小，是环保型聚氨酯防水涂料。     

一种高吸水性新型高分子复合肥载体的研究

研究了一种新型高吸水率和高吸收利用率的高分子复合肥 ,它以脲甲醛缩聚物作为载体 ,以聚乙烯醇缩甲醛作为吸水功能体 ,以磷酸钙、氯化钾作为包覆体 ,以硬质聚氨酯泡沫作为支撑体并采用发泡工艺制备。     

多官能度聚氨酯丙烯酸酯的合成及性能研究

采取两步法合成了高官能度聚氨酯丙烯酸酯,用实时红外光谱研究了多官能度聚氨酯丙烯酸酯的光聚合动力学,并研究了多官能度聚氨酯丙烯酸酯与其它单体配方的机械性能。研究发现随着丙烯酸官能度的增多,双键转化率也随之降低;官能度的增加会提高漆膜的硬度。     

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。     

聚氨酯胶粘剂的研究与应用

简述了聚氨酯胶粘剂的发展状况、粘接特性,以及其存在的不足之处和相应的改性研究。对其在包装业、建筑业、汽车制造、木材粘接、书籍装订、印刷业等方面的应用进行了详细介绍。指出新型高性能、可生物降解的环保型聚氨酯胶粘剂是今后研究的重要方向。     

Diffusion and sorption of benzene vapor through polybutadiene‐, polybutadiene/styrene‐, and polybutadiene/acrylonitrile‐based polyurethanes

A series of polyurethane (PU) films made from toluene diisocyanate (TDI), 1,4‐butanediol (BDO), and hydroxyl‐terminated polybutadiene (HTPB), hydroxyl terminated polybutadiene/styrene (HTBS), or hydroxyl terminated polybutadiene/acrylonitrile (HTBN) was synthesized by solution polymerization. The absorption of benzene vapor was found mainly in the soft phase. The equilibrium adsorption (M_∞) was reduced with increasing hard segment content for all the PUs. The values of M_∞ were in the sequence of HTBN‐PUs > HTBS‐PUs > HTPB‐PUs, which could be explained by the different interaction parameters between soft segments and benzene. The HTBN‐PU film showed the lowest degree of phase segregation and had more hard segments intermixed in the soft phase, restricting the movement of soft segments, and therefore resulted to non‐Fickian behavior, while the HTPB‐PU is antithetical. FTIR and atomic force microscopy were utilized to identify the hydrogen bonding behavior and morphology change of the PU films before and after the absorption of benzene vapor. The tensile strength of the HTBN‐PUs showed a greater decrease than that of HTBS‐PUs and HTPB‐PUs after absorbing benzene vapor. © 2004 Wiley Periodicals, Inc. J Appl Polym Sci 91: 2984–2991, 2004     

PFF与PUF热稳定性及燃烧性能研究

制备了酚醛泡沫和聚氨酯泡沫，并研究了酚醛硬泡与聚氨酯硬泡的热稳定性及燃烧性能。结果表明：和聚氨酯泡沫比较，酚醛泡沫的热失重小，热释放速率和热释放总量低。因此酚醛泡沫的热稳定性和阻燃性能明显优于聚氨酯泡沫。     

半刚性钢-混凝土组合节点受弯承载力的计算

在半刚性钢 -混凝土组合框架中 ,混凝土板中的纵向钢筋增加了节点的强度和刚度 ,但是 ,传统的设计方法往往忽略纵向钢筋的作用而采用简化的计算模型。因此 ,出于经济效益考虑 ,应该根据半刚性组合节点的实际受力性能建立更加准确的计算方法。这里详细介绍了考虑混凝土板纵向钢筋作用的半刚性组合节点受弯承载力的计算方法 ,计算结果表明 ,建议的公式与试验结果吻合良好 ,可供规范制定和工程应用参考。     

Structure and properties of regenerated cellulose films coated with polyurethane–nitrolignin graft‐IPNs coating

A regenerated cellulose film (RC) was coated with a graft‐IPNs coating, which was composed of castor oil‐based polyurethane and 2.8 wt % nitrolignin (NL), to obtain water‐resistant films. The effects of NCO/OH molar ratio and different polyols, such as 1,4‐butanediol (BDO) and trimethanol propane (TMP), on the structure and properties of the coated RC films were investigated. With an increase of the NCO/OH molar ratio, the tensile strength of the coated films increased, but the water resistivity and size contraction hardly changed. The coated films with TMP exhibited the higher breaking elongation at 1.5 of the NCO/OH molar ratio, while those with BDO have more excellent tensile strength, water resistivity, and dimensional stability. The coated films with the graft‐IPNs coating exhibited superior water resistivity and dimensional stability. The light transmittance of the coated films was more excellent than that of the RC film. Moreover, the results from the IR and electron probe microanalysis (EPMA) showed that the chemical bonding occurred between cellulose and coating, and the introduction of NL plays an important role in the enhancement of the interface adhesion of the coated films. Atomic force microscopy (AFM) depicted the flat and dense surface of the coated films, which restricted the water vapor penetration and the size contraction, resulting in the enhancement of water resistivity. © 2002 Wiley Periodicals, Inc. J Appl Polym Sci 86: 1799–1806, 2002