共查询到19条相似文献,搜索用时 78 毫秒
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以偶氮二异丁腈为引发剂,研究了丙烯腈与丙烯酸在环己烷中的自由基溶液共聚合反应。探讨了单体质量分数,引发剂质量分数,反应温度等对共聚反应的影响。用乌式粘度计测定了产物的相对分子质量。用IR和TG对产物的结构和性能进行了表征。研究结果表明,最佳反应条件是:总单体质量分数30%,AIBN占总单体质量分数5%,反应温度为70℃,反应时间为4 h。 相似文献
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本文主要阐述了丙烯酸胺与顺丁烯二酸酐的水溶液共聚反应的条件,测定了单体的竞聚率.并用IR(红外光谱)、SEM(扫描电镜)对共聚物的结构进行了表征.研究了它的结构与性能的关系,得到了单体转化率高,性能好的吸水性材料. 相似文献
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本文较全面地研究了温度、溶剂、光敏剂对丙烯酸-苯乙烯、丙烯酸-甲基丙烯酸β羟乙酯体系光引发共聚合反应的影响,测定了共聚合反应速率和暗反应速率及丙烯酸-苯乙烯体系共聚合反应的竞聚率r_1、r_2,找到了抑制暗反应的有效方法和分离、精制手段,并尝试了二元及三元共聚得到新型高分子材料的可能性。 相似文献
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丙烯酸-马来酸酐共聚物在碱性无磷洗涤剂中的应用研究 总被引:1,自引:0,他引:1
去掉磷酸钠后 ,洗涤剂的去污力有所降低 ,而其他碱性助剂如硅酸钠、碳酸钠、 4A沸石等的大量加入又会使洗涤剂pH值升高 ,灰分沉积严重。研究了丙烯酸 马来酸酐共聚物 (AA -MA)在碱性无磷洗涤剂中的应用 ,证明丙烯酸 马来酸酐共聚物具有很好的螯合性能和分散性能 ,应用在洗涤剂中能缓冲pH值 ,有效防止灰分沉积 相似文献
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以l,3-二环己基碳化二亚胺为缩合剂,通过微波辐射法制备了不同取代度的丙烯酸β-环糊精酯(β-CD-AA),并且采用溶液法成功合成了丙烯酰胺-β-CD-AA-烯丙基-联苯基醚(ABE)三元共聚物和丙烯酸(AA)-β-CD-AA-ABE三元共聚物。研究表明:微波法合成β-CD-AA具有反应时间短,易于控制的优点;所合成的三元共聚物具有较高的热稳定性和吸附性能,其中,AA-β-CD-AA-ABE三元共聚物对Zn2+的吸附达47.5 mg/g,在废水处理方面有一定的应用前景。 相似文献
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Dispersion copolymerization of acrylamide with acrylic acid in an aqueous solution of ammonium sulfate using poly(2‐acrylamido‐2‐methylpropanesulfonic acid sodium) as the stabilizer and ammonium persulfate (APS) as the initiator was investigated. The influence of initiator concentration, stabilizer concentration, ammonium sulfate concentration, chain‐transfer agent concentration, and polymerization temperature on the copolymerization was discussed. The results showed that varying the ammonium sulfate concentration could affect the particle size and the intrinsic viscosity of the copolymer significantly. With increasing the stabilizer concentration, the particle size of the copolymer decreased first, and then increased, meanwhile the intrinsic viscosity of the copolymer decreased. The increase of initiator concentration, chain‐transfer agent concentration, and polymerization temperature resulted in the increase in the particle size. Polydisperse spherical particles were formed in the system, and the kinetics for the dispersion copolymerization were discussed. © 2006 Wiley Periodicals, Inc. J Appl Polym Sci 102: 3685–3690, 2006 相似文献
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Micron‐size functional crosslinked poly(methyl methacrylate) (PMMA) particles with narrow size distribution in the range of 1~5 µm were prepared by dispersion copolymerization in polar media with poly(N‐vinylpyrrolidone)(PVP) as steric stabilizer, 2,2′‐azobisisobutyronitrile(AIBN) as initiator and ethylene glycol dimethylacrylate (EGDMA) as crosslinking agent. The effects of functional comonomer acrylic acid (AA) concentration, contents in AIBN, EGDMA and PVP, media polarity as well as reaction temperature on the particle size and size distribution were investigated. Particle size initially increased, and then decreased with increasing AA concentration in the range of 0.7~3.5 mol l?1, having a maximum of 5.01 µm at the concentration of 2.1 mol l?1, while size distribution became broader. This was regarded as the result of different roles of PAA in the process. Particle size increased with decreasing media polarity and stabilizer concentration, and with increasing initiator concentration and reaction temperature. The resulting particle shapes were observed by transmission electron microscopy and the presence of carboxyl groups on the surface of the particles was confirmed by Fourier‐transform infrared spectroscopy. Copyright © 2003 Society of Chemical Industry 相似文献
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大粒径硅溶胶在涂料、化学机械抛光、催化剂载体等工业领域中都有着极其广泛的应用。在添加适量催化剂的条件下,采用单质硅粉氧化法制备了大粒径溶胶。重点介绍了大粒径硅溶胶的分类、性质及应用,通过研究不同条件下大粒径硅溶胶的粒径增长过程分析了大粒径硅溶胶制备过程中的粒径增长机理。在添加阴离子表面活性剂的条件下,采用浓缩蒸馏实验研究了大粒径硅溶胶粒径增长与其浓度的关系,结果表明:随着大粒径硅溶胶浓度的增大,大粒径硅溶胶的粒径呈先减小后增大的趋势。最后提出了制备大粒径硅溶胶的粒径控制工艺。 相似文献
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麦秸秆纤维素与丙烯酸接枝共聚制备耐盐性吸水树脂的研究 总被引:1,自引:0,他引:1
应用小麦秸秆与丙烯酸接枝共聚制备了耐盐性吸水树脂,进行了结构表征,研究了单体配比、丙烯酸中和度、引发剂和交联剂用量以及反应温度对吸盐水倍率的影响。研究发现,接枝共聚的适宜条件为:丙烯酸单体与麦秸秆质量比为8∶1,丙烯酸中和度为70%,引发剂过硫酸钾-硫代硫酸钠的用量为单体的3.5%,交联剂N,N-亚甲基双丙烯酰胺用量为单体质量的0.24%,反应温度为70℃。在此条件下制备的树脂吸盐水倍率最高,吸盐水(CNaC l=0.9%)可达68 g/g,可应用于医疗卫生等方面。 相似文献
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激光粒度仪测定PTA粒径分布 总被引:4,自引:0,他引:4
介绍了激光粒度仪测定PTA粒径分布的分析方法 ,通过试验确定了分析条件 ,并与筛分法分析结果进行了对比。该方法简捷、快速、重现性好 ,适用于PTA产品的粒度分析。 相似文献