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Search Results: 1 - 10 of 7509 matches for " 聚丙烯酰胺 "
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丙烯酰胺水溶液聚合──添加Na2CO3制取高分子量阴离子型速溶聚丙烯酰胺的研究
季鸿渐,孙占维,张万喜,李志宏
高分子学报 , 1994,
Abstract: 本文建立了丙烯酰胺水溶液聚合的潜在型引发体系;研究了在碳酸盐法聚合体系中,添加不同量氨、尿素、EDTA—2Na,以及聚合体系pH、单体浓度、聚合水浴温度对聚合产物分子量及其溶解性能的影响规律和原因;解决了产物高分子量与产生不溶聚合物之间的矛盾;指出了获得高分子量阴离子型速溶粉末产品的关键.从而,用碳酸盐法得到了溶解性能优异的[η]高达28dl/g的胶体产品和[η]高达22dl/g的速溶粉末产品.
钻孔灌注桩废弃泥浆絮凝处理工程应用
Engineering Field Application of Waste Slurry Flocculation Treatment for Cast-in-Situ Bored Pile
 [PDF]

张钦喜, 陶韬, 王晓杰, 翟玉新
Hans Journal of Civil Engineering (HJCE) , 2015, DOI: 10.12677/HJCE.2015.46032
Abstract: 随着我国建筑行业的迅速发展,钻孔灌注桩得到了广泛应用,然而,其所造成的废弃泥浆处理问题也愈发严重,得到了广泛关注。笔者通过大量室内试验发现,相比较于其他泥浆处理方法,运用化学絮凝固液分离法处理废弃泥浆具有泥水分离速度快,后续处理效果好,可有效减少环境污染,节约施工处理成本的特点,本方法化学试剂选择聚丙烯酰胺(阴离子)与生石灰分别加入。本文在室内试验的基础上,于建筑施工工地进行泥浆现场处理,处理效果良好,和室内试验结论基本吻合,有利佐证了此方法的优势与实用性,可以得到应用与推广。
With the rapid development of construction industry in China, cast-in-situ bored piles have been widely used; however, the problem of waste slurry treatment is also more and more serious, get a wide attention. Through a large number of indoor experiments, the author found that the chemical coagulation was used in comparison with other methods. Liquid separation is very effective for treating waste slurry. It has the characteristics of fast separation speed and good following treat-ment effect. It can effectively reduce environmental pollution and save the cost of the construction process. The chemical reagent of this method is to select PAM and CaO. This paper is based on the indoor test, and in the construction site of the slurry on the site treatment; the treatment effect is good, and the indoor experimental results are basically consistent, which proves the advantages and practicality of this method, and it can be applied and popularized.With the rapid development of construction industry in China, cast-in-situ bored piles have been widely used; however, the problem of waste slurry treatment is also more and more serious and gets a wide attention. Through a large number of indoor experiments, the author found that the chemical coagulation was used in comparison with other methods. Liquid separation is very effec-tive for treating waste slurry. It has the characteristics of fast separation speed and good following treatment effect. It can effectively reduce environmental pollution and save the cost of the con-struction process. The chemical reagent of this method is to select PAM and CaO. This paper is based on the indoor test, and in the construction site of the slurry on the site treatment; the treatment effect is good, and the indoor experimental results are basically consistent, which proves the advantages and practicality of this method, and it can be applied and popularized.
聚丙烯酰胺板状凝胶的简单干燥方法
梁舜薇,潘苏华
生物化学与生物物理进展 , 1990,
Abstract: 我们依据组织逐级脱水的原理,经过摸索得到一种经济简单的凝胶干燥方法,特别是解决了浓度较高(10%—15%)凝胶和3%—25%梯度凝胶的干燥,可将聚丙烯酰胺板状凝胶干燥成一张平整、透明的干胶片,可直接照相或用感光胶片直接印制成负片。现将方法介绍如下:
Low-background and high-resolution contracted silver-stained method in polyacrylamide gels electrophoresis
低背景、高分辨率PAGE简易银染法

GAO Dong,DU Fei,ZHU You-Yong,
高东

遗传 , 2009,
Abstract: The disadvantage of time-consuming and fussy steps of conventional silver-stained method for polyacrylamide gels is evident, and has become the choke point in its application. In this paper, a low-background and high-resolution con-tracted silver-stained method for polyacrylamide gels was established. Compared with the conventional banding method, this contracted method has fewer steps and needs fewer reagents, in particular, lower NaOH concentration. It is rapid and economic, especially for mass silver-staining.
Study on the Flocculation Mechanism of Poly-crylamide
聚丙烯酰胺絮凝机理的研究

Wang Qi,Jiang Zhanpeng,
王琦
,蒋展鹏

环境科学 , 1989,
Abstract: This paper deals with the shape condition of polyacrylamide at the optimum flocculation state using Mean Square Root End-to-End Distance as the shape pa-ramenter of polyacrylamide in aqueous solution. It shows that Mean Square Root End-to-End Distance can be used as the floceulation control factor. When using polyacrylamide to treat water and the bigger the Mean Square Root End-to-End Distance is, the better the results of flocculation of polyacrylamide. Various factors affect the shape of polyacrylamide in aquious solution while in the determined ionscondition Mean Square Root End-to-End Distance can be limited. Hydrolysis test reveals that optimum solubility of polyacrylamide is 54%. It is found that at the range of 0 to 1 mg/L of polyacrylamide the effect of flocculation can come up to optimum and the optimum concentration of polyacrylamide is 0.4 mg/L. In addtion, the shape of polyacrylamide in aqueous solution has been observed by electromicroscope with a satisfied result.
STUDY ON BEHAVIOR OF POLYACRYLAMIDE IN DILUTE AQUEOUS SOLUTION (I)
水溶性高聚物聚丙烯酰胺的稀溶液性质(Ⅰ)

BAO Shu-qin,YANG Hong,HAO Ke-jun,
薄淑琴
,杨虹,郝克君

高分子学报 , 1992,
Abstract: The properties of fractionated polyacrylamide(PAAM, Mw 104-107) in dilute aqueous salt solutions were studied by light scattering and viscometric methods. The relationships among intrinsic viscosity, mean square redius of gyration )z, the second virial coefficient A2 and weight average molecular weight were observed respectively. Additional results PAAM in 0.2 mol/1 NaCl aqueous solution were also obtained from a excluded volume exponent v = 0.566 A2: The ratio of the mean square end to end distance to 2>2 equals 6.68 and the interaction parameter between macromolecules and solvents is 0.489.
水溶性聚合物和两亲聚合物:聚(丙烯酰胺-co-丙烯酸钠)-g-聚(β-胺基丙酸)接枝共聚物
尚振平,方天如
高分子学报 , 1994,
Abstract: 合成了端丙烯酰胺基聚(β-胺基丙酸)大分子单体,用端基滴定法和1H-NMR法测定了大分子单体的分子量,用^1^3C-MNR和氢氧化钠水解法测定了支化度,在水溶液中用硫酸亚铁/异丙苯过氧化氢氧化还原引发体系引发丙烯酰胺,丙烯酸钠与聚(β-胺基丙酸)大分子单体的共聚反应,合成了聚(丙烯酰胺-co-丙烯酸钠)-g-聚(β-胺基丙酸)用1H-NMR和滴定法测定了接枝共聚物的组成。溶液性质的数据表明,与部分
干旱胁迫下聚丙烯酰胺浸种对谷子种子萌发及幼苗期抗旱性的影响
柯贞进,尹美强,温银元,黄明镜,黄学芳,郭平毅,王玉国,原向阳
核农学报 , 2015, DOI: 10.11869/j.issn.100-8551.2015.03.0563
Abstract: 为探讨聚丙烯酰胺(PAM)浸种对谷子抗旱萌发的影响,本研究通过聚丙烯酰胺(PAM)浸种晋谷21种子,用18%的PEG6000溶液模拟土壤干旱,研究了不同浓度的PAM溶液(0.1%、0.5%、1.0%、5.0%、7.0%、10.0%)浸种对干旱胁迫下谷子种子萌发及幼苗生长中各项生理指标的影响。结果表明:干旱胁迫下的谷子发芽能力显著低于正常水分条件,幼苗中SOD、POD、CAT的活性、Pro、O2-以及MDA的含量均增加,但可溶性蛋白的含量降低;1.0%~7.0%的PAM溶液浸种可明显促进干旱胁迫下谷子种子的萌发和幼苗生长,有效提高幼苗活性氧清除系统中抗氧化酶的活性,增加渗透调节物质的含量,减少O2-和MDA的积累。综合分析,筛选出用于谷子浸种的最佳PAM浓度为5.0%。结果表明,适当浓度的聚丙烯酰胺浸种可缓解干旱胁迫对谷子萌发和幼苗生长造成的伤害,增强谷子的抗旱性,这为PAM在生产实践中的应用提供了理论依据。
煤及高岭石的选择性絮凝
邹文杰,曹亦俊,李维娜,刘炯天,王永田
煤炭学报 , 2013,
Abstract: 为考察选择性絮凝-浮选中絮凝剂对煤与高岭石的选择性作用,研究了絮凝剂聚丙烯酰胺在煤及高岭石表面的吸附等温线及吸附量差值。使用激光粒度分析仪测试了煤和高岭石在不同聚丙烯酰胺作用下所形成絮体的表观粒径分布,并计算了聚丙烯酰胺分子的流体力学半径和吸附半径以讨论其空间吸附构象。研究表明,煤对阴离子型聚丙烯酰胺的吸附量高于高岭石,且吸附量差值随分子量的增大而减小,高岭石对阳离子型聚丙烯酰胺的吸附量高于煤,吸附量差值较小。分子量为3×106阴离子型聚丙烯酰胺选择性最好,煤和高岭石对其吸附过程更符合Langmuir吸附模型,质量浓度为12mg/L时,煤对其吸附量是高岭石的2.15倍,使煤絮体的d10,d50,d90分别为高岭石絮体的8.42,2.60和2.75倍。计算聚丙烯酰胺的吸附半径小于其流体力学半径,其在矿物表面的吸附发生了强度不同的压缩或穿插效应。
大孔聚丙烯酰胺树脂的Hofmann降解反应(Ⅰ)
袁直,杨德富,申丽华,何炳林
科学通报 , 1996,
Abstract:
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