荷电型聚芳醚酮气体分离膜的研究--磺化度与中和离子对H2/N2气体透过行为的影响

以聚芳醚酮为主链，经磺化引入荷电基团(-SO3H)得了具有不同磺化度和不同中和盐型的均质膜．测试了它们不同温度下的H2/N2透过行为，讨论了磺化度和中和离子对其透过行为的影响，并证明了荷电化可以提高均质膜对H2/N2的分离系数．     

PVC/VC-co-VAc共混改性膜的研究

采用相转化法制备了PVC／VC-co-VAc共混膜，考察了不同聚合物浓度、共混比、添加剂用量、双组分添加剂等因素对膜分离性能的影响．借助于扫描电子显微镜(SEM)对膜的结构进行了研究。对孔的形成机理进行了探讨．     

结合清洁生产谈目前氯化法钛白生产的污染治理

结合实例说明,搞好清洁生产对氯化法钛白企业治理环境污染,提高企业的经济效益和今后长远发展起着举足轻重的作用和重要的指导意义.     

25℃NH_4Cl-KCl- H_2O三元体系相平衡的研究

研究了２５℃ＮＨ４Ｃｌ－ＫＣｌ－Ｈ２Ｏ三元体系的固液相平衡关系,测定出有关溶解度数据, 结果表明该体系存在纯 ＮＨ４Ｃｌ、纯 ＫＣｌ、 ＮＨ４Ｃｌ为主的固溶体及 ＫＣｌ为主的固溶体等 ４个 结晶区．     

Scattering of phonons by vacancies

The scattering of phonons by vacancies is estimated by a perturbation technique in terms of the missing mass and the missing linkages. An argument is given why distortion effects can be disregarded. The resonance frequency of the defect is sufficiently high so that resonance effects can be disregarded for phonons in the important frequency range for thermal conduction. The theory is applied to the thermal resistance by vacancies in cases where the vacancy concentration is known: potassium chloride with divalent cations, nonstoichiometric zirconium carbide, and tin telluride.     

聚乙烯亚胺为主链的液晶高分子研究进展

综述了近几年以聚乙烯亚胺(PEI)为主链的液晶高分子的研究进展.从PEI型液晶高分子的原理、结构和性能方面着手,展望了几类新型PEI液晶高分子的发展趋势.     

Synthesis of TiO2 nanopellet by TiCl4 as a precursor for degradation of RhodamineB

In the present investigation in order to promote TiO₂ pellet structure and its photocatalytic activity, two new precursors were synthesized in the powder and sol forms, using sol–gel method with precipitation of TiCl₄. Since TiO₂ pellets are normally synthesized by the commercial TiO₂ powder (DegussaP25), in this investigation and in the first step a new synthesized TiO₂ powder was produced and compared with DegussaP25. Subsequently, two types of pellet were made by the new synthesized powder and titania sol. The characterization of the synthesized TiO₂ powder and pellet were performed by XRD, FT-IR, scanning electron microscopy (SEM) and atomic force microscopy (AFM). The result showed that by the new procedure utilized here, without using any additive not only the surface area of the produced TiO₂ powder has been increased, but also the crystalline phase is completely in the anatase form. It was also found that the synthesized pellets by the sol precursor had better morphological structure than the synthesized pellets by theTiO₂ powder (either DegussaP25 or new synthesized powder). Ultimately, in order to evaluate photocatalytic activity of TiO₂ powders and pellet, degradation of RhodamineB was tested.     

苯乙烯-马来酸酐交替共聚物钠盐/聚苯乙烯磺酸钠复合物的湿敏特性

以苯乙烯-马来酸酐交替共聚物钠盐(NaSMA)与聚苯乙烯磺酸钠(NaPSS)复合物为湿敏材料,在叉指金电极上浸涂成膜制备了电阻型湿度传感器,考察了NaSMA和NaPSS浓度对复合湿度传感器响应特性的影响.研究表明,加入NaPSS可降低传感器在低湿下电阻,同时提高传感器的高湿灵敏度.在最佳条件下,当环境湿度从33%RH增...     

强电场作用下早龄期混凝土的氯离子迁移特征

电化学除氯技术能有效降低混凝土结构中的有害氯离子,降低混凝土结构失效风险。采用强电场方式对混凝土结构进行电化学除氯,并在不同的早龄期时间介入40、80、120 min的强电场作用,测试了内部氯离子含量变化和分布特征,并对通电后养护28 d试件进行回弹强度试验。研究结果表明：早龄期介入强电场作用能显著提高除氯效率,达到相同除氯效果时的作业时间约为传统电化学方法的1/300;氯离子分布特征表明,自由氯离子分布较传统电化学参数作用时更均匀,结合氯离子仍然存在保护层中间堆积现象;强电场作用后进行标准养护,回弹测试结果表明,强电场对混凝土的保护层宏观强度无明显影响。