共查询到20条相似文献,搜索用时 78 毫秒
1.
2.
水溶性聚丙烯酸钠的合成及其应用 总被引:2,自引:0,他引:2
聚丙烯酸钠是近年来国内外广泛研究开发的精细化工产品之一,不同分子量的聚丙烯酸钠具有不同的作用。简述了水溶性聚丙烯酸钠的合成方法,并对不同分子量的聚丙烯酸钠的性能和应用进行了阐述。 相似文献
3.
低分子量聚丙烯酸钠的合成 总被引:1,自引:0,他引:1
采用自由基溶液聚合方法制备了低分子量聚丙烯酸钠,研究了链转移剂用量、单体浓度、温度、反应时间及引发剂用量、加料方式等因素对聚丙烯酸钠分子量的影响。实验结果表明,合成了低分子量(500-10000)聚丙烯酸钠。 相似文献
4.
5.
6.
7.
8.
10.
11.
12.
13.
14.
聚丙烯酸类超强吸水剂的合成与性能研究 总被引:4,自引:0,他引:4
以丙烯酸烯丙酯作为交联剂、丙烯酸(AA)为单体、过硫酸钾(KPS)为引发剂,采用溶液聚合法合成了一种聚丙烯酸类超强吸水剂。研究了合成条件对吸水性能的影响:当ρ(丙烯酸烯丙酯)=0 594g/L,ρ(KPS)=0 178g/L,单体中和度x(丙烯酸钠)=90%,c(丙烯酸钠)=4 17mol/L,聚合温度为60℃时,制得的聚合物每克吸去离子水最高达到1360mL,吸盐水(生理盐水)162mL。所得的聚合物具有良好的吸水可逆性,30min的吸水量可以达到饱和吸水量的90%。制得聚合物的热重分析表明,未吸水的该聚合物在350℃开始分解。聚合物吸水前后XRD测试结果显示:吸水前聚合物结构基本无规整性,吸水后膨胀使主链展开,结构趋于规整。 相似文献
15.
研究了低相对分子质量的聚丙烯酸钠合成及其作为分散剂在矾土基低水泥浇注料上的应用。该合成的特点是采用了过硫酸盐与还原剂硫代硫酸钠组成的复合引发剂体系,并且使用次磷酸钠作为新型链转移剂,代替了传统的异丙醇,最终得到所需分子量的产品。同时研究了其产品作为高效分散剂在矾土基低水泥浇注料的耐火材料上的应用,结果表明,合成的产品具有良好的分散效果。 相似文献
16.
采用反向悬浮法合成了聚丙烯酸钠高吸水性树脂,考察了原料配比(单体中和度、引发剂用量、交联剂用量、油水比等)对产物吸水性能的影响。探讨了无机盐离子和有机溶剂的存在对产物吸水性能的影响。 相似文献
17.
《国际聚合物材料杂志》2012,61(4):307-321
Thickening is one of the main attributes of high molecular weight poly(sodium acrylate) as a water-soluble polymer. The acrylate polymer was prepared through polymerization of NaOH-neutralized acrylic acid in aqueous solution. The reaction mixture was open to the atmosphere, providing unrestricted access to oxygen. The sodium metabisulfite/ammonium persulfate redox system was used as an initiator in the free-radical polymerization. After prevailing on a few synthetic practical problems, certain parameters affecting the reaction and product characteristics were studied. The parameters were the initiator and monomer concentration, reaction temperature, pH, and chain transfer agent (i.e., isopropanol). As-synthesizedpolymers were purified and evaluated viscometrically by a Brookfield viscometer (0.5 Wt% polymer solution in distilled water at 25°C). Intrinsic viscosity, [ m ], was also measured to calculate the viscosity average molecular weight (M v ) based on the corresponding Mark-Hawink-Sakurada equation. Changes of the isolated polymer yield, viscosity, M v , and a couple of indirect kinetic factors including gelation/reaction times and temperature were investigated according to the mechanism and known kinetic relationships of the free-radical addition polymerization. Finally, a useful Brookfield viscosity-M v curve was obtained and suggested to use for facile estimation of the average molecular weight of a typical poly(sodium acrylate) sample having medium to high molecular weight. 相似文献
18.
A monolithic copolymer hydrogel was synthesised by polymerising n-isopropylacrylamide and sodium acrylate in the presence of poly(sodium 4-styrenesulfonate) (PSSS) chains and studied as potential draw agent for forward osmosis (FO) process. The monolithic hydrogel synthesised from 19% NIPAM, 1% SA, and 15% PSSS at 60°C generated higher FO water flux and higher recovery rate than other hydrogels, due to improved membrane-hydrogel contact and water transport. In particular, the synthesised hydrogel draw agent achieved twice water flux compared with the particles. The monolithic hydrogel containing a smaller amount of water produced a higher water flux due to its high swelling pressure. 相似文献
19.
In this study, uranyl ion adsorption from aqueous solutions has been investigated by highly swollen gelatin and poly(vinyl alcohol) based semi-interpenetrating polymer network systems of acrylamide/sodium acrylate. For this, chemically cross-linked copolymer of acrylamide/sodium acrylate hydrogels with gelatin and/or poly(vinyl alcohol) were prepared by free radical polymerization in an aqueous solution of acrylamide and sodium acrylate using ammonium persulfate/N,N,N′,N′-tetramethylethylenediamine as redox initiating pair in the presence of poly(ethylene glycol)diacrylate as a cross linker. Adsorption studies were investigated by spectrophotometric method at 25°C. Sorption capacity, removal efficiency, and partition coefficient of the hydrogels were investigated. Removal efficiency was changed within a range of 7.06–33.03%. 相似文献