共查询到20条相似文献,搜索用时 62 毫秒
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本文作者用一种新型方法,即阴离子聚丙烯酰胺在碱性条件下用乙二醛交联的方法合成了交联聚丙烯酰胺凝胶。详细地考察了合成过程中诸如交联反应时间、交联反应温度、配比、干燥过程等条件对凝胺平衡溶胀比的影响,制得了性能较为优良的凝胶。 相似文献
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聚丙烯酰胺在水胶炸药凝胶体系中的应用研究 总被引:3,自引:0,他引:3
讨论了采用聚丙烯酰胺作为胶凝剂制备水胶炸药的影响因素。研究了聚丙烯酰胺的用量、聚丙烯酰胺的水解时间、交联剂的选择、交联剂的用量、反应温度等相关因素对水胶炸药成胶时间和热稳定性的影响,得出了较佳工艺条件。 相似文献
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HPAM延缓交联弱凝胶体系研究 总被引:1,自引:0,他引:1
本文通过在聚丙烯酰胺( HPAM)溶液中添加有机铬交联剂,配制了延缓交联弱凝胶,介绍了该体系配方组成,具体考察了体系对中原油田采油二厂文5 1块地层环境( 90℃,TDS:1×1 0 5mg/L,其中Ca2 +、Mg2 + :2 70 0 mg/L)的适应性。实验结果表明:该体系聚合物和交联剂用量少,体系的交联时间可延缓48小时,使体系在置入目的地层前具有良好的可泵性,体系在模拟地层条件下30天不脱水,不沉淀,体现出良好的稳定性。研究了聚合物、交联剂、延缓交联剂和稳定剂浓度以及p H值对弱凝胶粘度的影响。 相似文献
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影响弱凝胶体系成胶的因素 总被引:3,自引:0,他引:3
弱凝胶是由浓度(800~1000mg/L)的聚合物与交联剂形成以分子间交联为主,黏度在100~3000mPa·s之间,具有溶液三维网络结构的弱交联体系;具有成本低、成胶时间长,聚合物和交联剂用量低等特点。本文综述了聚合物性质、交联剂性质、pH值、温度、矿化度等因素对弱凝胶体系成胶的影响。 相似文献
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聚丙烯酰胺凝胶及其固定化细胞扩散性能的研究 总被引:3,自引:0,他引:3
应用自行设计的扩散池,以稳态操作方式测定了聚丙烯酰胺凝胶单体浓度、交联度、聚合温度、扩散温度、组分浓度、酵母细胞浓度等对葡萄糖和/或乙醇在聚丙烯酰胺凝胶及其固定化细胞中有效扩散系数的影响。并得到了有效扩散系数与各因素间的关联式。 相似文献
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Adrian Thomas Christopher D. Gilson Tanveer Ahmed 《Journal of chemical technology and biotechnology (Oxford, Oxfordshire : 1986)》1995,64(1):73-79
Equipment was developed to measure the time for complete gelling of sodium alginate fibres in calcium chloride solution, taken as the time to achieve maximum tensile strength. The effects of fibre diameter, alginate concentration, alginate composition and calcium chloride concentration on gelling time were investigated. A diffusional model, developed to predict the gelling time, agreed with experimental results except for the effect of calcium ion concentration which was modelled empirically. 相似文献
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以阳离子型聚丙烯酰胺(CPAM)乳液为原料,采用水解工艺制备两性型聚丙烯酰胺(APAM),并对该水解工艺进行优化。结果表明,以Na2CO3为水解剂,Na2CO3和原料CPAM中丙烯酰胺单元的物质的量之比为0.3,CPAM的阳离子度为20%,反应温度为50℃和反应时间为2 h的条件下,所得产物水解度可达27.3%,相对分子量为1.2×106左右。傅立叶红外光谱(FT-IR)和热重分析(SDTA-TGA)结果表明,CPAM的水解产物为APAM,具有良好的热稳定性,分解温度为305.5℃。 相似文献
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《国际聚合物材料杂志》2012,61(1-4):131-137
Abstract The thermooxidizing stability of aqueous solutions of polyacrylamide in the temperature range of from 20°C to 70°C in water with different degrees of mineralization containing H2S and Fe2+ is researched. The affect of some of the above-mentioned factors on the change in molecular weight and molecular weight distribution is studied. Some aspects of the mechanism of thermooxidative destruction of polyacrylamide are investigated. To stabilize aqueous polyacrylamide solutions a number of water-soluble antioxidants phenolic, aminophenolic and amine types, metal-deactivator, containing phosphorus, nitrogen and sulfur, are studied. The optimal proportion of components and their total concentration in aqueous solutions is established for composite stabilizers. For aqueous polyacrylamide solutions, containing the most effective stabilizers, rheological characteristics and oil-driving ability are studied in an oil-stratum model. The applications of stabilizers considerably increases the resistance factor, residual resistance factor and oil-driving ability of polyacrylamide solutions. 相似文献
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聚丙烯酰胺结构和溶解性能 总被引:11,自引:0,他引:11
依据烯类单体聚合性能的酰胺基的反应特性来论述在丙烯酰胺聚合过程中产生交联的可能性。借助聚丙烯酰胺溶解机制阐述了聚丙烯胺结构的对其溶解性能的影响。为了制备优异溶解性能的聚丙烯酰胺,上述因素应认真考虑。 相似文献
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Mengwei Liu Jin Zhao Shunzo Shimai Dan Han Jian Zhang Shiwei Wang 《Journal of the American Ceramic Society》2022,105(7):4632-4638
MgAl2O4 transparent ceramics were shaped by a commonly used polyacrylic acid (PAA), which acted as both dispersant and gelling agent. The spinel slurries were prepared by ball-milling MgAl2O4 powder, PAA, and water in an attrition mill. The gelling of slurries happened at room temperature in air atmosphere without any other organic additive. The gelling mechanism was the formation of chelates between Mg2+ and carboxyl groups (-COO−) of PAA. The frequency-based testing method was applied to investigate the gelling process of the as-prepared slurry. In addition, a novel in situ characterization method based on a modified indentation testing was invented to better understand the strengthening of the wet green body with time and to guide when demolding could be carried out. After sintering, transparent MgAl2O4 ceramics with high in-line transmittance were resulted. 相似文献
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超高分子量聚丙烯酰胺 总被引:11,自引:0,他引:11
采用加碱大块均聚后水解工艺合成超高分子量聚丙烯酰胺,产品可用于石油开采、水处理、造纸和污泥脱水等。本项目研制的新型水溶性引发剂可用于各类水溶性单体聚合,可大幅度提高产品分子量,改善产品的水溶性。 相似文献