排序方式: 共有11条查询结果,搜索用时 15 毫秒
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The monomer methacrylamido propyl trimethy ammonium chloride( MAPTAC) was copolymerized onto the fiber surface of polypropylene( PP) nonwoven fabric under ultroviole radiation. The weak acid red GN dye adsorption and adsorptive filtration performance of the resulted PP fabrics were investigated.The results showed that the grafting copolymerization preferred to happen in the inner layer of the fabrics. The water flux of the grafted fabrics decreases with the increase of grafting yield. The collapse of the grafted polymer chains causes the flux increase in acidic condition,or vice versa at alkaline version. The coiling of the polyelectrolyte chains upon the dye adsorption seems to violate the routine assumption of the rigid substrate, and this gets the adsorption energy constant negative. The static adsorption process follows the Lagergren's pseudo-second order kinetic equation. The removals of circa( ca.) 100% of the total permeation volume3 500 mL simulated dye wastewater was reached during permeation.The dye adsorbed fabrics were regenerated by the mixed media of the cationic surfactant / ethanol /water. The grafted fabric assumes stable fabric integrity and stability during permeation,and presents excellent dye adsorption capacity,easy desorption, and repeatable utilization. 相似文献
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金属氧化物对聚氯乙烯热降解性能的影响 总被引:4,自引:0,他引:4
研究了二氧化锰(MnO2)和氧化铁(Fe2O3)对聚氯乙烯(PVC)热降解和热氧化降解过程的影响。电导率测试得出:PVC在空气和氮气环境下热降解时,都表现出自诱导脱氯化氢反应特征,而MnO2一定程度上消除了PVC热降解时自加速反应特征,Fe2O3实质性地改变了氯化氢释放规律,随时间的推移,使氯化氢释放量缓慢线性增加。热失重法与差热分析量热法显示MnO2和Fe2O3均阻止了氯化氢挥发释放过程,且加速了PVC主链断裂与挥发过程。 相似文献
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Kinetic Parameters of Thermal Degradation of Polymers 总被引:1,自引:0,他引:1
The derivative expressions between activation energy(E) and the temperature at the maximum mass lossrate(T_(max)) and between activation energy (E) andexponent (N) were deduced in the light of Arrheniustheory. It was found that the increase of activationenergy results in the decrease of exponent and the 相似文献
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网上考试系统的研究和开发 总被引:3,自引:0,他引:3
首先简要介绍网上考试系统的作用,然后重点介绍开发B/S结构网上考试系统的总体设计、功能模块设计以及设计中采用的关键技术等问题. 相似文献
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Annual production output of poly (ethylene terephthalate)(PET) fiber has been over 15 million tons in China due to its good mechanical properties and processability,but the shortage of hydrophilic grou... 相似文献
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ASP.NET技术在通用网络考试系统中的应用 总被引:1,自引:0,他引:1
详细介绍了辽宁大学本科教学改革科研项目—“通用题库及网上测试系统”中“通用网络考试系统”的开发环境、系统组成、系统功能和关键技术,并对开发过程中遇到的Datalist控件使用和题目重复抽取的问题,提出了相应的解决方法. 相似文献
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非等温热分解活化能的求解及应用 总被引:1,自引:0,他引:1
比较了热分析实验中热降解活化能的常见求解方法的特点和应用场合,并阐述了利用活化能评价高分子材料热稳定性及探讨热分解反应机理的实际意义。 相似文献
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从教育投入的角度构造了中等职业教育GDP估算的方法,并利用1991-2009年的有关数据具体估算出了江苏省中等职业教育GDP,这有利于中等职业教育问题的进一步研究。 相似文献