排序方式: 共有16条查询结果,搜索用时 13 毫秒
1.
2.
3.
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
4.
基于聚合物分子间物理相互作用和统计平均场理论,引入附加共聚焓定义,使聚合物分子间的作用得到量化,同时推导出二元共混体系相互作用参数和三元共混体系混合焓关系式.利用所导出的公式解释一些常见聚合物共混体系和增溶体系.导出的关系式很好地解释了聚合物的热力学混溶性,但不能解释聚合物共混增溶作用. 相似文献
5.
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
6.
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
7.
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
8.
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
9.
10.
朱新生 《数理统计与应用概率》1995,10(4):15-20
带有层套关系因子变量的方差分析模型在实际应用中有广泛的适应性。然而,由于此类模型的特殊性,我们不能利用一些通常的统计软件对它进行模型拟合成参数估计,针对这一问题,本文提出了对该模型进行分层拟合以及由设立哑变量将此类模型转化为通常的协方差分析模型再加以解决这两种可行而方便的办法。本文还提出了与之相关的模型变量优选的方法以及该模型在教育数据分析上的应用。 相似文献