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多功能阳离子聚丙烯酰胺的研究
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摘要
本文研制了一种新型的吡啶季铵盐型阳离子聚丙烯酰胺[Cationic P(AM-co-VP),简称为CPAV],它是兼具有絮凝、缓蚀与杀菌性能的多功能水处理剂。
     首先进行了两种共聚物P(AM-co-VP)和CPAV的合成及共聚合动力学的研究。以过硫酸钾(K_2S_2O_8)为引发剂,采用溶液自由基共聚合方法,实现了丙烯酰胺(AM)与4-乙烯基吡啶(4-VP)的共聚合,制得了两单体的无规共聚物P(AM-co-VP);通过详细研究共溶剂体系、单体总浓度、反应温度、反应时间及引发剂量对共聚合过程中转化率和分子量的影响,从而确定了适宜的共溶剂体系和最佳的工艺条件;用Kelen—Tudos方法,求得单体4-乙烯基吡啶(4-VP)和丙烯酰胺(AM)的竞聚率,r_(4-VP)=0.644,r_(AM)=0.371:将P(AM-co-VP)用硫酸二甲酯季铵化,制备了系列吡啶季铵盐型阳离子聚丙烯酰胺CPAV。
     用多种方法对P(AM-co-VP)及CPAV的分子结构与组成进行了充分的表征,所采用的方法有:红外光谱法(FTIR)、核磁共振谱法NMR(~1H-NMR和~(13)C-NMR)、紫外光谱法(UV)和乌式粘度计法。
     最后,对CPAV的絮凝与缓蚀性能进行了较深入的研究。采用模拟工业废水—硅藻土溶液对CPAV进行了絮凝性能实验;采用失重法在硫酸溶液中进行了CPAV对A_3钢板的缓蚀性能实验,并用扫描电镜(TEM)观察了缓蚀程度;较详细研究了CPAV的阳离子度与分子量对其各功能的影响规律,探索研究了CPAV分子结构与其性能之间的关系。
     实验结果表明:本课题合成的吡啶季铵盐型阳离子聚丙烯酰胺CPAV兼具有优良的絮凝和缓蚀性能。CPAV之。所以具有良好的絮凝净化效果,是因为其阳离子性的高分子链兼具有吸附架桥和电荷中和作用;CPAV之所以具有良好的缓蚀效果,是因为其高分子链上含有吡啶环且具有阳离子性,能够与金属之间产生较强的物理吸附与化学吸附,从而使其在金属表面形成一层致密难溶的缓蚀膜。
In this paper, a novel cational water treatment agent, pyridine quaternary ammonium salt-type cationic polyacrylamidefCationic P(AM-co-VP),simplified as CPAV],which can be used as a muti-function wasterwater agent possessing flocculation, corrosion inhibition and sterilization function, has been synthesized.
    First of all, the synthesis of P(AM-co-VP) and CPAV and the kinetics of its copolymerization process were investigated.The copolymerization of 4-vinyl pyridine(4-VP) with acrylamide(AM) has been realized by radical copolymerization in solution using potassium persulfate as initiator, and the random copolymer P(AM-co-VP) of two monomers was obtained; By studying in detail the effects of cosolvent system, comonomer concentration, polymerization temperature, polymerization time and initiator amount on polymerization conversion and molecular weight, appropriate cosolvent system and optimum process conditions were confirmed; the monomer reactivity ratios of 4-VP and AM were obtained with Kelen-Tudos method, r4.vp =0.644, TAM =0.371; P(AM-co-VP) was quaternarized using dimethyl sulphate and two series of CPAV having pendant quaternary pyridinium group have been synthesized.
    The molecular structure and composition of P(AM-co-VP) and CPAV were fully characterized using many methods. The methods available were Fourier Transform Infrared spectroscopy(FTIR^ Nuclear Magnitic Resonance spectrometry NMR (1H-NMR and 13C-NMR) Ultraviolet spectrophotometry(UV) and Ubbelohde viscometer.
    Finally, flocculation and corrosion inhibition properties of CPAV were studied in more detail. The flocculation experiment of CPAV proceeded using siliceous earth solution as simulated industry wastewater; corrosion inhibition experiment of CPAV went on in sulfuric acid solution with method of loss of weight for AS sheet steel and corrosion inhibition degree was observed using Scanning Electron Microscope(SEM); by discussing the influence law of cationic degree and
    
    
     molecular weight of CPAV on the flocculation and corrosion inhibition property at length, the relationship between molecular structure and property of CPAV was investigated.
    The experimental result showed that CPAV had excellent flocculation and corrosion inhibition property. CPAV had good flocculation property because its cationic molecular chain possesses bridging adsorption and charge neutralization at the same time. Due to its pyridine ring and cationic polymer chain, CPAV could yield greater physisorption and chemisorption ,form a compact layer adsorption film on the mental surface and have a better effect on corrosion inhibition.
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