Metal coated and nanofiller doped polycarbonate membrane for hydrogen transport

The modification in the polymeric membrane combined with metallic film as well as composites with inorganic nanofiller can be used for separation of various gases, with hydrogen gas as it is widely used as fuel material. The change in free volume due to modification in polymer chains alters the transport mechanism. In this work, the transport behaviour of H₂ across the different metal coated and nanocomposite membrane has been studied and compared with that of standard polycarbonate membrane. Transport properties changes due to the modification in the composition of nanofiller. A PtPd alloy thin film and iridium thin film of around 8–10 nm was coated on polycarbonate substrate using sputtering technique to make layered polymer nanocomposite membrane. Moreover, SiO₂ nanocomposites with 10 wt% and 15 wt % were prepared by solution casting method and the uniform dispersion of silica nanoparticles was obtained by sonication before casting the membrane. Further, the tests were carried at constant upstream pressure 30 psi and at constant temperature 35 °C using constant volume/variable pressure method.     

Pt nanowires prepared via a polymer template method: Its promise toward high Pt-loaded electrocatalysts for methanol oxidation

Platinum nanowires were prepared via a template-synthesis method by electrodeposition of platinum within pores of a track-etched polycarbonate (PCTE) membrane, followed by chemical etching to separate the Pt nanowires from the polymer. The structure and morphology of the Pt nanowires were characterized by X-ray diffraction (XRD), field-emission scanning electron microscopy (FESEM), and transmission electron microscopy (TEM), revealing a polycrystalline phase with nanowire dimension up to 6 μm long and ca. 47 ± 9.8 nm of diameter. The unsupported Pt nanowires showed the better electrochemical mass activities over the methanol electro-oxidation than supported or unsupported Pt nanoparticles under the high Pt content-loaded conditions that is typically required for direct methanol fuel cells. This enhancement could be rationalized by its unique physicochemical and electrical properties arising from the inherent anisotropic one-dimensional (1D) nanostructure, such as charge transfer facilitation by reducing number of particle interfaces and more efficient use of Pt by alleviating fraction of embedded catalysts.     

聚碳酸酯/尼龙6共混体系动态流变性能研究

采用平板动态流变仪研究了聚碳酸酯/尼龙6(PC/PA6)共混体系在设定温度下的动态流变性能,并探讨了增容剂用量、剪切频率等因素对高聚物动态复合黏度、动态储能模量及损耗因子等动态流变参数的影响。结果表明,PA6的加入明显改善了PC的加工流动性,3种增容剂的加入增强了分子间作用力和分子链之间的缠结,提高了界面黏合力。     

聚碳酸酯微孔泡沫塑料力学性能的研究

采用超临界微孔发泡技术制备出一系列聚碳酸酯(PC)微孔泡沫塑料,通过扫描电镜、力学性能测试等方法研究了超临界流体温度对发泡剂(CO2)含量的影响,及发泡温度、发泡时间和超临界流体温度对PC微孔泡沫塑料力学性能的影响。结果表明:在测试范围内,随超临界CO2流体温度的升高,CO2含量降低;升高发泡温度或延长发泡时间均使PC微孔泡沫塑料的拉伸强度和冲击强度降低;随超临界CO2流体温度的升高,PC微孔泡沫塑料的拉伸强度增加,冲击强度降低。     

全氟磺酸盐与硅氧烷协同阻燃聚碳酸酯的研究

采用全氟磺酸盐/聚硅氧烷复合阻燃剂,制备了聚碳酸酯(PC)工程阻燃材料。通过热重分析(TGA)、微型燃烧量热测试(MCC),以及垂直燃烧性能测试等手段,研究了该阻燃材料的热降解和燃烧过程,并对复合阻燃剂的阻燃机理进行了分析。结果表明:全氟磺酸盐和聚硅氧烷具有良好的协同阻燃作用,可大幅提高阻燃效率,实现阻燃剂的小剂量化。     

聚碳酸酯螺旋式挤出吹塑机头的实验研究

简述了目前聚碳酸酯挤出吹塑机头存在的常见缺陷,自行设计一套新型的螺旋式挤出吹塑机头,并用于挤出吹塑聚碳酸酯饮水桶。研究发现,该新型的螺旋式挤出吹塑机头具有清洁性好、无熔合线、无黑点、壁厚均匀以及生产损耗小的优点。     

航空聚碳酸酯老化研究进展

主要综述了航空聚碳酸酯的老化机理研究,几种老化现象以及老化试验研究方法,并展望了聚碳酸酯未来的发展趋势。     

ACR增韧聚碳酸酯/聚乳酸合金的制备与性能研究

以核壳结构的丙烯酸酯类树脂(ACR)作为增韧剂,对聚碳酸酯(PC/)聚乳(酸PLA)合金进行增韧改性,研究了ACR用量对合金力学性能、热性能和微观形态的影响。结果表明:加入一定用量的ACR,合金的冲击强度大幅度提高,而其他力学性能影响较小;合金比例为PC/PLA=90/10时,二者的相容性良好,体系只有一个玻璃化温度;ACR的用量对合金的微观形态有一定的影响。     

光反射聚碳酸酯反射性能的研究进展

以光反射聚碳酸酯为主线,分析了作为反光板材料的反射性能的本质及其相关的影响因素,以作为不同反射要求的使用要求的配方更改作为指引.