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Keywords:
Polyacrylamide
Thermal Stability
Oxidizing agent
我们的研究基于在一种 shear 状态下面由 polyacrylamide 和 montmorillonite 组成的系统经常出现在象钻等等很好一样的一些重要实际过程的事实。polyacrylamide 的粘性通常是在特征之中的最重要的决定实际过程是否成功。因此，我们与温度在 polyacrylamide 的粘性上学习了含水的 montmorillonite 的效果并且砍评价变化在下面限制由分子的模拟方法砍。采用条件限制在研究砍能使我们的模拟和实际过程尽可能类似。首先，有线性地连接的 20 单体的一 polyacrylamide 聚合物链的模型走水路包围了在二 montmorillonite 层之间的分子被构造。然后正规的整体(NVT ) MD 模拟在不同温度为造的模型被执行并且砍率。从获得的模拟结果，我们计算了聚合物旋转的结构的性质半径，它直接与 polyacrylamide 的粘性性质有关聚合物。在含水的泥土层之间的 polyacrylamide 聚合物的粘性减少了，温度在条件下面从 298 ～ 343 K 增加，这被发现限制砍。从模拟结果的粘性的变化趋势被我们的实验也证实。而且，在含水的泥土层之间的 polyacrylamide 的粘性减少了， shear 率在范围以内增加更高砍率。
Polyacrylamide
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The possibility that anionic polyacrylamide takes the place of cationic polyacrylamide has been studied.The paper discusses the effect of the quantity of anionic polyacrylamide,etherificatin,buffering time and pH on the efficiency of sludge dewatering.The results show that the effect of anionic polyacrylamide can be nearly as good as that of cationic polyacrylamide,which can reduce cost.Taking economic factor and effect of sludge dewatering into account,this experiment proves the best quantity of anionic polyacrylamide,the proportion of anionic polyacrylamide to etherification,the best time of buffering,the best pH and so on.
Polyacrylamide
Cationic polymerization
Papermaking
Dewatering
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Although H2S2O8 shows weak oxidizing property at room temperature, it works as a strong oxidizing agent at higher temperature via H2SO5 to H2O2 finally and therefore it had been used only as an oxidizing agent. However, H2O2 oxidizes compounds of lower valency, while it reduces that of higher valency, namely it reduces oxidizing compounds and so H2S2O8, which converted to H2O2 at higher temperature is considered. to react as a reducing agent towards oxidizing com pounds. While H2SO4 was added to heat with KMnO4, MnO2, Ce(SO4)2, CeO2, K2Cr2O7, CrO3, NH4VO3 and V2O5, and then (NH4)2S2O8 was added, they were recognized to be reduced. Therefore, if (NH4)2S2O8 is used as an oxidizing agent, it should be heated after it is added at room temperature, however, in order to use it as a reducing agent, it should be added after it is heated.
Oxidizing agent
Valency
Reducing agent
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Ultralow molecule weight partly bydrolytic polyacrylamide was synthesized by radical polymerization using thi-ol as a chain transfer agent;then modified polyacrylamide was prepared by ring-opening reaction of glycidyl methacrylate with above synthesized polyacrylamide,and characterized by 1H-NMR. After that a new nontoxic water-soluble polyacrylamide grouting material was prepared by using water-soluble redox system and adding other reagent,and compared its property with that of acrylamide grouting material.The result shows that the modified polyacrylamide grouting material is an environmental protective grouting material with excellent performance.
Polyacrylamide
Glycidyl methacrylate
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Polyacrylamide
Coalbed Methane
Isothermal process
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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.
Polyacrylamide
Degradation
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Complex Properties of Black Wattle Extract and Its Oxidizing Modified Products Reacting With Cr(III)
Complex reactions between Cr 3+ and Black Wattle Extract and its oxidizing degraded products (obtained by using 15%,30%and 60% H 2O 2)have been studied and variations of pH and precipitate in these reactions ave also been determined. The results show that(1)The oxidizing degraded products have different complex properties from original extract, and vary with oxidizing degree.(2) The complexes of high oxidizing degraded products with Cr(Ⅲ) have no precipitate in pH 2-12,and they can resist certain alkali; While the complexes of moderate oxidizing degraded products have precipitate, and precipitate rises correspondingly with temperature rises, and varies with different products.(3)Under the same temperature,pH rises with the increase of usage in extract products, and the higher the oxidizing degree of products, the higher pH rises.
Oxidizing agent
Wattle (construction)
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The in-situ application results of comb-shape polyacrylamide showed that the comb-shape polyacrylamide can increase the viscosity value of 58 percent to 81 percent more than that of the ordinary Daqing polyacrylamide,and 22 percent to 70 percent more than that of the ordinary polyacrylamide MO??4000 produced by Japan,under the same conditions.The oil displacement efficiency of comb-shape polyacrylamide can increase by two times compared with that of the ordinary polyacrylamide.At the same time,it can decrease the polymer dosage by 30 percent more than the ordinary polyacrylamide.The excellent economy,social and environment benefits of comb-shape polyacrylamide for polymer flooding,alkaline-surfactant-polymer flooding and cross-linking polymer flooding have been achieved.It has become an excellent high-efficiency oil displacement agent and profile modification agent for oilfield exploitation.
Polyacrylamide
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For studying the effect of the property of polyacrylamide on flocculation efficiency, nonionic polyacrylamide of coal slurry, compose anion polyacrylamide and cation polyacrylamide of coal shurry and make flocculating settling experiments on the discharge of Wangfenggang Coal Preparation Plant. The influence of molecular weight, hydrolytic degree (HD) and cationic degree(CD) on flocculation efficiency wiss researched, and flocculation mechanism of polyacrylamide are also analyzed.
Polyacrylamide
Cationic polymerization
Coal slurry
Settling
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