共查询到19条相似文献,搜索用时 125 毫秒
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以无皂乳液聚合法合成得到聚(三氟氯乙烯/乙烯基正丁基醚/羟丁基乙烯基醚/十一烯酸钠)P(CTFE-BVE-TGME-SUA)乳液,考察了SUA及TGME的用量对乳液稳定性及粒径大小的影响,并研究了聚合物膜的表面性能。结果表明:P(CTFE-BVE-TGME-SUA)乳液稳定性好,粒径分布均匀;P(CTFE-BVE-SUA)聚合物乳液中SUA对乳液的稳定性和粒径大小影响较大;P(CTFE-BVE-TGME-SUA)聚合物乳液中TGME对乳液的稳定性和粒径大小影响较大;P(CTFE-BVE-TGME-SUA)聚合物膜的表面性能随着TGME含量的增加而下降。增加聚合物乳液中TGME的含量P(CTFE-BVE-TGME-SUA)聚合物膜对溶剂的接触角变小,表面能提高。 相似文献
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通过无皂乳液聚合法制备得到聚(三氟氯乙烯-乙烯基异丁基醚-十一烯酸钠)[P(CTFE-IBVE-SUA)]含氟乳液。考察了单体配比对聚合反应的影响,研究了SUA用量对乳液及聚合物性能的影响,并对聚合物的结构及乳胶粒的形貌进行了测定。结果表明:含氟无皂乳液P(CTFE-IBVE-SUA)的稳定性好、粒径分布均匀;改变单体配比中IBVE和CTFE的比例可以得到不同结构的含氟聚合物乳液;SUA用量对乳液的稳定性、乳胶粒的粒径大小及粒径分布、聚合物膜与水的接触角都有很大的影响;制得的乳液具有明显的核壳结构。 相似文献
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通过无皂乳液聚合制得聚(乙烯基正丙基醚-三氟氯乙烯-十一烯酸钠)[P(PVE-CTFE-SUA)]三元无皂乳液,考察了SUA用量对乳液稳定性、乳胶粒的粒径及接触角的影响,分析了PVE和CTFE的比例与聚合物结构及性能的关系,同时测试了乳胶粒的形貌。结果表明:无皂乳液聚合可以制得稳定性好、粒径分布均匀的含氟乳液,SUA对乳液的稳定性和表面性能影响较大;PVE和CTFE的比例影响聚合物的结构和性能,在一定条件下聚合物为交替共聚物。 相似文献
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三元复合驱采出液的稳定性及破乳机理研究 总被引:1,自引:0,他引:1
研究了碱/表面活性剂/聚合物对乳液稳定性的影响规律,单一的碱、表面活性剂和聚合物对乳液的稳定性有较大的影响:3种化学剂之间存在明显的协同作用,对乳液的稳定性影响很大.最后概述了三元复合驱采出液的化学破乳机理. 相似文献
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辛醇在无皂乳液聚合中的应用 总被引:1,自引:1,他引:1
提出了在无皂乳液中加入挥发性有机物质辛醇进行聚合反应 ,以提高乳液的性能及稳定性。详细讨论了各种因素对合成无皂乳液的影响 ,得出了最佳工艺条件 :辛醇的用量为单体质量的 3 0 % ;m(CH2 CHCOOC2 H5) ∶m(C6H5CHCH2 ) =1 0 0 0∶0 2 2 9;反应温度 85℃ ;反应时间3h ;恒温时间 0 5h ;乳液的 pH =8 0。加料方式 :辛醇与单体混合 ,乳化剂与水混合。实验证明 ,挥发性有机物质与极少数乳化剂的复合使用不仅提高了乳液的稳定性 ,而且也大幅度提高了乳液聚合物的性能 ,尤其是冻融稳定性得以很大的改善 相似文献
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乳液聚合技术最新研究进展 总被引:8,自引:0,他引:8
在简单介绍乳液聚合特点的基础上,重点对近几十年来乳液聚合中发展的新技术,如核/壳乳液聚合、互穿网络聚合、微乳液聚合、无皂乳液聚合以及其它的一些新型乳液聚合方法进行了综述。 相似文献
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乳液聚合法是制备水性含硅聚合物最常见、最有效的方法。介绍了种子乳液聚合、核/壳乳液聚合、无皂乳液聚合、微乳液聚合、互穿网络聚合等制备水性含硅聚合物的方法,并对水性含硅聚合物涂料的应用做了探讨。 相似文献
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一种可自交联有机硅乳液的制备 总被引:2,自引:0,他引:2
通过苯乙烯乳液聚合成种子,再在种子核外生成苯乙烯与甲基丙烯酸-3-三甲氧基硅丙酯(MPS)的共聚物,形成核-壳型乳胶粒,从而得到自交联型的水分散涂料。这种含硅涂料能在涂覆过程中发生自交联反应,不仅有效提高了涂层的光滑度、耐候性和耐沾污性,更减少了可挥发性有机溶剂(VOC)的排放量。通过透射电子显微镜(TEM)和动态光散射仪(DLS)研究了反应条件对所得乳液型涂料稳定性的影响。发现在MPS参与的乳液共聚合过程中,需选用离子型乳化剂,保持介质pH值在7左右,控制MPS浓度来提高乳液稳定性,防止乳胶粒聚并。并用红外光谱(FTIR)和^29Si固态核磁谱(NMR)表征了所得聚合物的微结构。 相似文献
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In this paper, the ultrasonic induced encapsulating emulsion polymerization technique was used to prepare polymer/inorganic nanoparticle composites. The main affecting factors in ultrasonic induced encapsulating emulsion polymerization were studied systematically. The experimental results suggested that the pH value, the type of monomers, the type, content, and surface properties of nanoparticles, the type and concentration of surfactant have great influence on the ultrasonic induced encapsulating emulsion polymerization and the obtained latex stability. If selecting cationic emulsifier (such as cetyl trimethylammonium bromide), low water soluble monomer (such as n‐butyl acrylate and styrene), and hydrophobic nano silica, the inorganic nanoparticles could be encapsulated by polymers through ultrasonic irradiation successfully under alkalescent condition, forming a novel polymer/inorganic nanoparticles composite. The mechanism of ultrasonic induced encapsulating emulsion polymerization and the composite latex stabilization are proposed. © 2001 John Wiley & Sons, Inc. J Appl Polym Sci 80: 1130–1139, 2001 相似文献
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In this study, ultrasonic irradiation and in situ emulsion polymerization were combined to prepare stable poly(methyl methacrylate‐co‐n‐butyl acrylate) (P(MMA‐BA))/carbon nanotubes (CNTs) composite emulsion, which solves the dispersion problem of CNTs in the latex. Two stages were adopted. In Stage I, ultrasonically initiated in situ emulsion polymerization was conducted to disperse CNTs and prepare the seed emulsion containing polymer coated CNTs. In Stage II, conventional in situ emulsion polymerization was conducted to further enhance the monomer conversion and solid content. The dispersion behavior of MWCNTs in aqueous solution under ultrasonic irradiation was investigated by spectrophotometry. The effects of CNTs content on the emulsion stability and mechanical properties of composite film were studied. The results suggest that in the composite emulsion the long CNTs with a diameter of 20–40 nm are separated and dispersed by the formed polymer latex nanoparticles with a size of 20–40 nm. The spherical polymer latex nanoparticles adhere to the wall of CNTs to form a structure like “grapes on the twig.” The smooth, uniform, and flexible polymer/CNTs composite films were prepared from the composite emulsion. The CNTs can be individually dispersed in P(MMA‐BA)/CNTs composite film. Tensile tests suggest that with the increase in the CNTs content, the Young's modulus and the yield strength of the film increase. Only at 1 wt % CNTs, the Young's modulus increases from 124 to 289 MPa, and the yield strength is improved about ~14%. © 2006 Wiley Periodicals, Inc. J Appl Polym Sci 100: 3123–3130, 2006 相似文献