Photo-Grafting Copolymerization of PP Nonwoven Fabric and Its Application for Acidic Dye Adsorption and Filtration

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.     

金属氧化物对聚氯乙烯热降解性能的影响

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。     

网上考试系统的研究和开发

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.     

两个东亚钳蝎抑制型昆虫毒素cDNA的克隆及序列分析

蝎在长期的进化过程中逐步形成了一套为生存所需的毒素成分。蝎毒贮存于蝎子尾刺的毒囊内,它不仅是蝎子捕食御敌的必要武器,也是人类用来治疗某些疾病的良药。蝎毒按其作用的对象可分为3类:作用于哺乳动物的神经毒素、作用于甲壳纲类动物的神经毒素和作用于昆虫的神经毒素。这些毒素现已作为有效工具物被广泛地应用于相关离子通道的研究中。     

Kinetic Parameters of Thermal Degradation of Polymers

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     

Microstructure and Properties of PET Fabric Grafted by Polyacrylic Acid with Inverse Microemulsion Polymerization

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...     

川西北草地牦牛钩体病的调查研究

前言近30年米,有关钩端螺旋体病(钩体病)的研究,在医学或兽医学方面都有很大的进展。本病现已成为遍布世界各地的重要人、畜共患病之一,它在畜牧业方面所造成的危害相当严重。又由于它是一种疫源地性疾病,在自然界有其广泛的野生动物和家畜宿主,长期带菌排菌,污染外界环境,常造成人群钩体病的发生和流行。我国目前26个省市均有人的钩体病报导,又以南方、西南各省区流行较严重。     

ASP.NET技术在通用网络考试系统中的应用

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.     

江苏省中等职业教育GDP估算及分析

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。     

Changes of Resistance During Polyelectrolyte-enhanced Stirred Batch Ultrafiltration

The permeation flux or the resistance in the ultrafiltration process is mainly limited by osmotic pressure,and it may originate from various kinds of polymer interactions. However, the real origin of permeation resistance hasn't been clarified yet in the light of polymer solution nature. The removal of nitrate contamination by polyelectrolytes was carried out with stirred batch ultrafiltration. The polyelectrolyte concentrations both in permeate and retentate were analyzed with total organic carbon analyzer and permeate mass was acquired by electronic balance connected with computer. The total resistance was calculated and interpreted based on the osmotic pressures in three concentration regimes. In the dilute region, the resistance was proportional to polymer concentration; in the semidilute region, the resistance depended on polymer concentration in the parabolic relationship; in the highly concentrated solution regime, the osmotic pressure factor (OPF) would dominate the total resistance; and the deviation from OPF control could come from the electrostatic repulsion between the tightly compacted and charged polyelectrolyte particles at extremely concentrated solution regime. It was first found that dilute and semidilute concentration regions can be easily detected by plotting the log-log curves of the polymer concentration versus the ratio of the total resistance to polymer concentration. The new concept OPF was defined and did work well at highly concentrated regime.