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纳米粒子类型对聚丙烯酸酯乳液压敏胶性能的影响 总被引:4,自引:0,他引:4
采用原位乳液聚合法将纳米SiO2、气相法SiO2、纳米TiO2、纳米CaCO3等无机纳米粒子引入到聚丙烯酸酯压敏胶乳液中,考察了纳米粒子类型对乳液聚合稳定性及复合乳液压敏性能的影响.结果表明,纳米SiO2和纳米TiO2的引入对乳液聚合的稳定性无实质上的影响,且能提高聚丙烯酸酯乳液压敏胶的综合性能,放置3个月后纳米SiO2复合乳液仍然有较好的稳定性和压敏性能;而气相法SiO2、纳米CaCO3在聚合时则有较高的凝胶率,且无论剥离力大小,均存在不同程度的脱胶或胶转移现象. 相似文献
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纳米纤维素作为一种高值绿色天然聚合物,因其兼具优异的机械性能、可成膜性、高透明度、可生物降解性、生物相容性好等特性,成为无机抗菌原料良好的载体或者基材,这类复合抗菌材料不仅成膜具有一定的机械强度和透明性,而且可提高无机抗菌剂的稳定性,在抗菌功能膜材料领域具有潜在的应用前景。近年来,以纳米纤维素为基体,引入无机抗菌纳米粒子制备纳米纤维素基无机复合抗菌材料成为抗菌新材料的研究热点。基于此,该文着重从纳米纤维素在复合抗菌膜材料制备中的作用与功效,综述了不同无机抗菌纳米粒子与纳米纤维素复合制备纳米纤维素基无机复合抗菌膜材料的研究进展,分析了各类纳米纤维素基无机复合抗菌膜材料的制备及应用优势,最后对纳米纤维素基复合抗菌材料的未来进行了总结和展望,以期为纳米纤维素基有机-无机复合材料的研究提供参考。 相似文献
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硅溶胶/含氟聚丙烯酸酯复合乳液的制备与表征 总被引:1,自引:0,他引:1
采用经典的St(o)ber法在常温下制备纳米级硅溶胶,用3-(甲基丙烯酰氧)丙基三甲氧基硅烷对其改性.在阴离子乳化剂和非离子乳化剂共同存在下,通过乳液聚合制备了硅溶胶/含氟聚丙烯酸酯复合乳液.表征了乳胶粒形貌,测试了共聚物组成及性能、乳液稳定性和乳胶膜性能.结果表明:乳胶粒有明显的核壳结构,乳液有良好的储存稳定性、稀释稳定性、高温和低温稳定性;硅溶胶/含氟聚丙烯酸酯复合乳胶膜吸水率达12.50%,对水的接触角为93 5°;复合物的热稳定性高于普通聚丙烯酸酯共聚物和含氟聚丙烯酸酯共聚物. 相似文献
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Poly (silicone‐co‐acrylate)/montmorillonite nanocomposite emulsion were prepared by in situ intercalative emulsion polymerization of acrylate and organosilicone, in the presence of organic modified montmorillonite (OMMT) with different OMMT contents (0, 0.5, 1, 1.5, and 2 wt %). The nanocomposite emulsions were characterized with X‐ray diffraction (XRD), laser light scattering, fourier transform infrared (FTIR), rheological measurements, surface tension, drying speed, and water absorption property. Results showed that OMMT could improve the properties of emulsion, in other words, the properties of nanocomposite emulsion were better when compared with those of the silicone–acrylate emulsion. The properties of nanocomposite emulsion containing 1 wt % OMMT was the best one, and obtained the following advantages: smaller particle size, faster drying speed, shorter curing time, smaller surface tension, bigger apparent viscosity, and improved resistant water by the incorporation of OMMT. © 2006 Wiley Periodicals, Inc. J Appl Polym Sci 101: 3963–3970, 2006 相似文献
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A new silicone containing acrylic monomer, methacryloxyethyl polymethylhydrosiloxane ether (MEPMHSE), based on polymethylhydrosiloxane (PMHS) and 2-hydroxyethyl methacrylate (HEMA) has been synthesized for formulation of nanocomposite emulsion. Then Poly (silicone-co-acrylate)/montmorillonite (PSAM)/nanocomposite emulsion were prepared by in situ intercalative emulsion polymerization of methyl methacrylate (MMA), butyl acrylate (BA), methacrylic acid (MAA) and MEPMHSE, in the presence of organic modified montmorillonite (OMMT) with different OMMT contents (0, 0.5, 1.0, 1.5 and 2 wt%) and auxiliary agents in the presence of potassium persulphate (KPS) as initiator. Alkylphenol ethersulphate and Arkupal N-300 were used as anionic and non-ionic emulsifiers, respectively. The resulting monomer was characterized by Fourier transformer infrared spectroscopy (FTIR), proton (1H NMR), and carbon (13C NMR) nuclear magnetic resonance spectroscopes. The OMMT was characterized by FTIR and X-ray diffraction (XRD). The nanocomposite emulsions were characterized by using Fourier transform infrared spectroscopy (FTIR), laser light scattering and surface tension. Thermal properties of the copolymers were studied by using thermogravimetric analysis (TGA) and dynamic mechanical thermal analysis (DMTA) and then the effects of OMMT percent on the water absorption ratio and drying speed were examined. Results showed that OMMT could improve the properties of emulsion, in other words, the properties of nanocomposite emulsion were better when compared with those of the silicone–acrylate emulsion. The property of nanocomposite emulsion containing 1 wt% OMMT was the best one, and the following advantages were obtained: smaller particle size, faster drying speed, smaller surface tension, and improved resistant water by the incorporation of OMMT. 相似文献
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Highly open porous crosslinked styrene/ acrylonitrile (SAN) polymerized high internal phase emulsion (PolyHIPE) foams containing various amounts of acrylonitrile (AN) were prepared by the polymerization of the continuous organic phase of high internal phase emulsions with an 85 vol % aqueous internal phase. The mean diameter of voids varied in the range 12.4–19.8 μm. The void diameter increased up to 10% AN, but beyond this limit, the diameter decreased. To improve the mechanical properties of the copolymer foams, the organic phase of the emulsion containing 20% AN was reinforced with organomontmorillonites with different surface modifiers. The effects of the organoclay on the equilibrium torque value of the emulsifying systems, as an approximate characteristic of the emulsion viscosity, and on the morphology and mechanical properties of the resulting foam were investigated. Scanning electron micrographs exhibited an open‐cell polyHIPE structure for all of the SAN/organoclay polyHIPE foams. The incorporation of organoclays within the emulsion copolymer foam significantly decreased the mean size of voids and intercellular pores compared with those of the copolymer foam without reinforcement. In fact, the presence of organoclay may have acted as a cosurfactant to improve the performance of the nonionic surfactant in the concentrated emulsions. The X‐ray diffraction patterns and transmission electron micrographs showed an intercalated nanocomposite structure for the organoclay‐reinforced copolymer foams. On the other hand, the addition of a more hydrophilic organoclay, that is, 3 wt % Cloisite30B, to the concentrated emulsion decreased the Young's modulus and significantly improved the crush strength of the emulsion copolymer foam. © 2010 Wiley Periodicals, Inc. J Appl Polym Sci, 2011 相似文献
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Synthesis of CaCO3–P(MMA–BA) nanocomposite and its application in water based alkyd emulsion coating
S.P. Gumfekar K.J. Kunte L. Ramjee K.H. Kate S.H. Sonawane 《Progress in Organic Coatings》2011,72(4):632-637
As part of broader effort to synthesize a new class of water-based composite, hybrid emulsion polymerization was carried out with acrylic monomers [methyl methacrylate (MMA), n-butyl acrylate (BA)]. Nanocomposite of P(MMA–BA)/nano CaCO3 was synthesized by in situ emulsion polymerization. Water-based alkyd coating with various proportions nano CaCO3, P(MMA–BA) and its nanocomposite was formulated. Extent of polymerization with and without nano CaCO3 was measured using gravimetric method. Thermal properties of neat polymer, nanocomposite and coating films were evaluated by TGA and DSC, DTA analysis. Uniform dispersion of nano CaCO3 in polymer matrix was ensured from SEM/TEM images. Incorporation of nanoparticles to hybrid polymer and nanocomposite to alkyd emulsion showed significant enhancement in mechanical and thermal properties. Dual role of nanocomposite in coating; as a partial binder and a filler to improve property profile of neat coating has been reported. 相似文献
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通过对粉状乳化炸药质量影响因素的分析,阐述了乳胶基质在保持粉状乳化炸药性能中的重要性,同时对影响乳胶基质的各个因素做出分析与阐述,旨在通过提高乳胶基质质量的基础上保证粉状乳化炸药的性能。 相似文献