共查询到20条相似文献,搜索用时 93 毫秒
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《化纤文摘》1999,(4)
994156芳酞胺纤维的可纺性Chylewska B.…;Fibres Text.East.Eur.,1997,5,(3),p .38一41(英)由芳酞胺短纤维纺成纱的起初的工艺是由纺织机械工艺研究所制订出来的。由第二类Kevlar短纤维制成纱用的是纺羊毛和亚麻的机器。Oksalon和Ter-lou纤维是用普通加工棉的机器生产的。基于这些工作基础,生产高质量的芳酞胺纤维纱是可能的。(张桂水)芳香族聚酞胺纤维纱可纺性 994157合成纤维生产新技术的述评Polk Maleolm B.…;J.Elastomers Plast.,1998,30,(1),p .45一54(英)文章论述了聚丙烯、聚醋、聚酞胺及聚丙烯睛系合成纤维生产领域中的新发… 相似文献
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聚丙烯酰胺的合成与应用 总被引:5,自引:0,他引:5
本文论述了聚丙烯酰胺的性质,国内外各种合成方法以及它的应用.1前言聚丙烯酞胺是一类水溶性的功能高分子产品, 由于它具有高分子量、高粘度、有氢键、易吸附等特点,因而被广泛用于分散、浓缩、润滑、粘附、成膜等方面。 相似文献
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《化纤文摘》1999,(6)
996074Karl Fischer公司:从开始到现在一直活跃于PA6的领域Raue E.;Chem.Fibers Intern.,1997,47,(6),P.465一466(英)文章评述了PA6的制造技术,描述了连续工作的聚合反应器(VK管)、萃取塔、干燥器、内酞胺水处理装置(具有可回收的特别装置),还给出了工艺步骤的流程图。(顾进)聚己内酞胺制造装置 996075聚酞胺6:用于纺织品长丝的纺丝和聚合技术Heintze A.…;Chem.Fibers Intern.,1997,47,(6),p .469一470(英)文章用9篇参考文献描述了PA6制造和纺丝技术及纺丝机的特点。这个纺丝机的主要特点是:固定点自由;流变性能最佳的聚合物流;在… 相似文献
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《化纤文摘》1994,(5)
945288帐段分明的接枝聚二甲基硅氧烷(PDMs)/聚酞胺(PA)接枝共聚物的合成及其特征Mougin N.…;Am.Chem,Soe.,Abstraets Pt.夕,POLY 358,1993,8,22一27(英)用两种以大分子引发剂为基础的方法成功地合成了一嵌段分明的PDMS/AP共聚物。第一种方法用。一甲硅烷基三氟化物聚酞胺作为环硅氧烷的阳离子开环聚合的大分子引发剂。由硅氧烷键合和活性阳离子格点之间的连续互换反应得到三嵌段PA户DMS/PA共聚物。第二种方法是用a,。一二酞基内酞胺一PDMS作为c一己内酞胺从二氧烷基氢化铅中阴离子聚合的大分子引发剂,接枝PDMs/PA共聚物从… 相似文献
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以丙烯酰胺和N,N-亚甲基二丙烯酰胺(NMBA)为单体,在引发剂的作用下聚合成交联聚丙烯酰胺,利用Hofmann降解的方法合成交联聚乙烯胺树脂(PVAm),研究了不同实验条件对交联聚乙烯胺降解率的影响,考察了交联聚乙烯胺树脂对金属离子的选择性吸附,并探讨了交联聚乙烯胺树脂在去离子水中的吸水性能。 相似文献
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《化纤文摘》1998,(4)
984084尼龙6的化学第四部分己内酞胺的水解聚合的技术Join 5.L.…;Manmade Textiles in India,1997,(7),p .286一297(英)己内酞胺与加压的水共同加热时形成氨基酸。当水被排出时,发生了尼龙6的聚合。对于尼龙6的最佳生产而言,主要的工艺参数是水的浓度及温度。聚合可以分批进行也可以连续进行。工业上的运行包括:单体的制备,聚合,萃取去除低分子量的化合物,己内酞胺的回收,以及熔融纺丝。用于纺织品等级的尼龙其溶液的相对粘度为2.2一2.6,工业上使用的尼龙等级相对粘度为3.2~3.5,用于棒材挤压成形用的相对粘度应高达6。为制成质量良好的聚… 相似文献
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《化纤文摘》2001,(3)
20013060聚酞胺高聚物切片的固相后聚合Walter B.,Chemieal Fibers International,2000,50,(1)p .34(英)PA高聚物切片的间歇式后聚合,其粘度可达4.2,其粉尘含量少于80%,日照下不影响黄色。装置为一间歇式反应器,装有加热及冷却系统、粉尘分离器、连续内酞胺分离器、其空机及分离控制器,后开关将切片在氮气流中冷却到60一15oC。后聚合在一滚动式干燥器保证粘度衡定。真空工艺将切片湿度降低到<0.05%。(王心明)聚酸胺切片反应器 20013061聚酸胺上轻乙基异丁烯酸盐的接枝聚合用单体的热处理溶液的反应方案BogaehevaL,V.…,Fibre Chemistr… 相似文献
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《化纤文摘》2002,(1)
20021064聚酞胺6生产技术和聚合物改性的持续发展Bergman K.;Chemleal Fibers International .2000,50,(6).p,536(英)尼龙6制造技术包括聚合物连续式和间歇式生产技术和高性能尼龙6的生产都适合运用高速纺。一步法聚合使用VK管,它由下部的柱塞流区和上部的混合伏组成。己内酞胺在进入VK管前受到由推流区回收的能量的预热。两步法聚合是在VK管聚合前,使用在仄力下高水份的预聚合。高性能尼龙6特点是改善J”挤出能力的熔化物、热学、化学、服用性的稳定,这是由一J:加入了作为链稳定剂的三二梭酸和改善染色性能的的酸胺添加剂。(姚慧婉)… 相似文献
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Mechanical stability of high‐molecular‐weight polyacrylamides and an (acrylamido tert‐butyl sulfonic acid)–acrylamide copolymer used in enhanced oil recovery
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Abdul‐Aziz Al‐Hashmi Rashid Al‐Maamari Ibtisam Al‐Shabibi Ahmed Mansoor Hamed Al‐Sharji Alain Zaitoun 《应用聚合物科学杂志》2014,131(20)
High‐molecular‐weight partially hydrolyzed and sulfonated polyacrylamides are widely used in enhanced oil recovery (EOR). Nonionic polyacrylamide and polyacrylamide‐based microgels are also used in water shut‐off treatments for gas and oil wells. A comparative study of the mechanical degradation for three linear polyacrylamides and a microgel is presented. Mechanical degradation is quantified from the loss of the viscosity of the polymer solution as it passes through a stainless steel capillary with a length of 10 cm and an internal diameter of 125 µm. The critical shear rate above which degradation increases exponentially was found to depend on the chemical structure of the polymer, molecular weight, and electrolyte strength. The nonionic polyacrylamide shows higher degradation and lower critical shear rate compared with a sulfonated polyacrylamide with similar molecular weight. Moreover, the nonionic polyacrylamide with a higher molecular weight results in lower mechanical degradation. The higher mechanical stability of the sulfonated polymer is attributed to the higher rigidity of its molecules in solution. On the other hand, the ability of the high‐molecular‐weight polymers to form transient, flow‐induced microgels boost their mechanical stability. This ability increases with the increase in the molecular weight of the polymer. Indeed, the microgel solution used in this study demonstrates exceptional mechanical stability. In general, mechanical stability of linear polymers used in chemical enhanced oil recovery can be enhanced by tailoring a polymer that has large side groups similar to the sulfonated polyacrylamide. Also, polyacrylamide‐based microgels can be applied if high mechanical stability is required. © 2014 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2014 , 131, 40921. 相似文献
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Roman V. Ivanov Vladimir I. Lozinsky Seok Kyun Noh Sung Soo Han Won Seok Lyoo 《应用聚合物科学杂志》2007,106(3):1470-1475
A new type of cryogel was prepared through a reaction of high‐molecular‐weight polyacrylamide (viscosity‐average molecular weight ≈ 3 × 106 Da) with glutaraldehyde in a moderately frozen aqueous medium. The influence of the crosslinking agent concentration and temperature of the reaction on the gel fraction yield, swelling characteristics, and morphology of the cryogels was investigated. The dependence of the gel fraction yield on the reaction temperature was bell‐shaped. The recognized regularities of the formation of this new type of polyacrylamide cryogel based on a high‐molecular‐weight precursor were very similar to those observed earlier for polyacrylamide cryogels synthesized through the cryopolymerization of monomeric precursors. © 2007 Wiley Periodicals, Inc. J Appl Polym Sci 2007 相似文献
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超高分子量聚丙烯酰胺水解干燥条件的研究 总被引:3,自引:0,他引:3
分析了聚丙烯酰胺水解、干燥过程中影响分子量及溶解性的主要因素。通过实验,对影响聚丙烯酰胺分子量的水解剂、水解温度、水解时间、水解浓度、胶体粒度、水解加热方法以及干燥时间、干燥温度等因素进行了优化选择,确定了聚丙烯酰胺后水解的工艺参数。并以此工艺参数为基础,确定了适合工业化生产的超高分子量聚丙烯酰胺水解及干燥条件。 相似文献
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Mark Houwink coefficients and molecular size parameters are presented for 31 unfractionated samples of polyacrylamide and hydrolyzed polyacrylamide in 0.5M and 1M aqueous NaCl. Polymers investigated include polyacrylamide, plus 10, 20, 50, 70, and 100 mol % poly(sodium acrylate). Their solution characteristics were studied by gel permeation chromatography, intrinsic viscosity, and light scattering techniques. A density function and heterodispersity index was assigned to each polymer sample due to the polydispersity of the molecular weight distributions. This technique improves the intrinsic viscosity–molecular weight correlation for heterodisperse commercially synthesized polymer systems. The intrinsic viscosity of these commercial compounds will yield useful estimates of their molecular weight, in spite of their obvious heterogeneity. 相似文献
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用聚丙烯酰胺合成氧肟酸型高分子絮凝剂,研究了温度、聚丙烯酰胺分子量、原料物料此、反应时间对反应的影响。实验结果表明:聚丙烯酰胺改性最佳反应温度是30℃,聚丙烯酰胺/盐酸羟胺(摩尔比)为1:1.5,反应时间为8h,聚丙烯酰胺分子量为3×10^6~6×10^6。 相似文献
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