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室温交联丙烯酸系弹性涂料的研究 总被引:2,自引:1,他引:1
本文研究丙烯酸酯类弹性涂料的合成,交联,性能,结构和形态,采用种子乳液聚合,合成了核-壳结构聚合乳液,引入羟基功能单体,调节核层和壳层的组成,以改进和提高弹性涂料所需要的性能,并降低聚合物的玻璃化温度。以多价金属离子为交联剂,使乳液进行室我联。用傅立叶红外光谱对交联乳液进行了结构分析。秀透射电镜和扫描电镜观察核-壳乳液交联后颗粒的形态,并研究交联乳液制成弹性涂料的物理机械性能,获得了一定结果。 相似文献
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将双丙酮丙烯酰胺(DAAM)参与共聚的苯丙乳液与含有肼基的聚氨酯水分散体混合后,得到了交联型聚氨酯/苯丙树脂复合乳液。研究了DAAM的用量对苯丙乳液的影响,用傅里叶红外光谱和透射电镜证实了酮羰基与肼基之间发生了交联反应。对乳液膜性能的研究结果表明,交联反应提高了乳液膜的耐水性、耐溶剂性、断裂强度、断裂伸长率。 相似文献
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交联型聚氨酯/苯丙树脂复合乳液的研究 总被引:2,自引:0,他引:2
将双丙酮丙烯酰胺 (DAAM)参与共聚的苯丙乳液与含有肼基的聚氨酯水分散体混合后 ,得到了交联型聚氨酯 /苯丙树脂复合乳液。研究了 DAAM的用量对苯丙乳液的影响。用傅里叶红外光谱和透射电镜证实了酮羰基与肼基之间发生了交联反应。对乳液膜性能的研究结果表明 ,交联反应提高了乳液膜的耐水性、耐溶剂性、断裂强度、断裂伸长率。 相似文献
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多重交联聚氨酯-丙烯酸酯复合乳液的合成研究 总被引:2,自引:0,他引:2
采用种子乳液聚合结合原位乳液聚合法,引入分子间和分子内交联的交联结构,制备了多重交联的聚氨酯-丙烯酸酯复合乳液,研究了交联基团加入方式、用量等对乳液及涂膜性能的影响.研究发现交联度的提高对于涂膜的硬度、耐水性、耐化学品性等有明显改进. 相似文献
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Metal‐ion complexation behavior of glycine functions supported on divinylbenzene (DVB)‐ and N,N′‐methylene bisacrylamide (NNMBA)‐crosslinked polyacrylamide was carried out toward Co(II), Ni(II), Cu(II), and Zn(II) ions. The polymeric ligands and the derived metal complexes were characterized by IR, UV, and EPR spectra and by SEM. The metal‐ion complexation of the rigid DVB‐crosslinked system is lower than that of the semirigid NNMBA‐crosslinked system. The glycine ligands renervated after the desorption of the metal ions showed an unusual specificity toward the desorbed metal ion. The low degree of crosslinking makes the desorption process simple and shows fast rebinding kinetics. The metal‐ion‐desorbed polymeric ligands would have pockets or holes characteristic of the desorbed metal ion, resulting in its specific rebinding. The rigidity of the crosslinking also determines the kinetics of metal‐ion rebinding. The specificity and selectivity characteristics of the crosslinked polymeric ligand was found to be increased as the crosslinking agent changes from semirigid NNMBA to rigid and hydrophobic DVB. Thus, copper‐desorbed resins showed an increased specificity toward copper ions and selectively binds copper ions from a mixture of copper and cobalt ions. The metal‐ion specificity and selectivity characteristics of the metal‐ion‐desorbed system is exploited for the concentration of desorbed metal ions from a mixture of metal ions. The resin is amenable for a continuous process and can be regenerated several times. © 1999 John Wiley & Sons, Inc. J Appl Polym Sci 74: 3432–3444, 1999 相似文献
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Polyurethane dispersion and urethane/acrylate composite latex were synthesized and characterized by using a particle size analyzer, gel permeation chromatograph (GPC), Fourier transform infrared spectroscopy coupled with attenuated total reflectance (FTIR‐ATR), dynamic mechanical analysis (DMA), and instron test machine. The amount of solvent and dimethylolpropionic acid (DMPA) used during synthesis of polyurethane resin straightway affected the average particle size and stability of aqueous polyurethane dispersion. The particle size of polyurethane dispersion had nothing to do with that of composite latex. FTIR‐ATR analyses displayed both air‐facing and substrate‐facing surfaces, containing more polyurethane component than the average composition. Some crosslinking reactions occurred in preparing urethane/acrylic composite latex, as indicated by FTIR analyses and solvent extraction. DMA demonstrated three glass transitions for the film from composite latex. Instron tests exhibited better film performance properties for the composite latex than for the corresponding blend latex. A possible particle growth mechanism for preparing urethane/acrylate composite latex was proposed. © 2002 Wiley Periodicals, Inc. J Appl Polym Sci 84: 1620–1628, 2002; DOI 10.1002/app.10526 相似文献
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Cycloaliphatic epoxide crosslinkable core-shell latexes: A new strategy for waterborne epoxide coatings 总被引:1,自引:0,他引:1
New core-shell acrylic latexes designed for crosslinking with cycloaliphatic diepoxides were prepared. The core consisted
of methyl methacrylate (MMA), butyl acrylate (BA), 2-hydroxyethyl met hacrylate (HEMA), and the shell MMA, BA, and methacrylic
acid (MAA). A strong acid acrylate was incorporated into the shell to catalyze the crosslinking reactions. The diepoxide crosslinker
was introduced into the latex formulation via three methods: (1) added with the monomers during the polymerization of the
latex, (2) added after the preparation of the latex in an organic solvent, and (3) added as a separate emulsion. The stability
of epoxide was shown to be dependent on latex morphology, initiator system, and reaction conditions.
Presented at the 77th Annual Meeting of the Federation of Societies for Coatings Technology, on October 18–22, 1999, in Dallas,
TX.
Department of Polymers & Coatings, Fargo, ND 58105. 相似文献
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D. J. T. Hill J. H. O'Donnell M. C. S. Perera P. J. Pomery P. Smetsers 《应用聚合物科学杂志》1995,57(10):1155-1171
The mechanism of radiation vulcanization of natural rubber with 2-ethyl hexyl acrylate (2EHA) monomer was investigated using electron spin resonance spectroscopy and nuclear magnetic resonance (NMR) spectroscopy. The primary radicals formed in the arcylate molecule were found to abstract the allylic hydrogens of the polyisoprene. Crossliking may occur through the allylic radicals and/or main chain radicals formed on the polyacrylate. Acrylate was found to concentrate in the rigid regions of the crosslinked rubber indicating heterogeneity and a nonuniform distribution of the acrylate in the latex particles. The addition of the acrylate and the irradiation seems to effect the Brownian motion of the latex particles. Both the viscosity and the NMR peak widths are effected by the irradiation. Addition of 5% 2EHA increases the crosslinking by a factor of 3.6. The thermal stability of the rubber first increases with the dose in the presence of acrylate, but drops at higher doses due to peroxide formation. © 1995 John Wiley & Sons, Inc. 相似文献
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Silicone‐modified styrene–butyl acrylate copolymer latex was synthesized by emulsion copolymerization by using octamethylcyclotetrasiloxane (D4), styrene, and butyl acrylate as raw materials, potassium persulfate as initiator and propylmethacrylate triethoxysilane (KH‐570) as crosslinking agent. The infrared spectra studies showed that the vinyl monomers were completely copolymerized with D4. The prepared silicone‐modified copolymer latex with the interpenetrating polymer networks tended to have higher stability, and better toluene and water resistance than styrene–butyl acrylate latex. The glossiness of coated paper was improved with silicone‐modified copolymer latex, and it was at a maximum when D4 was about 3% of total monomers. © 2000 John Wiley & Sons, Inc. J Appl Polym Sci 79: 333–336, 2001 相似文献
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Crosslinked polymeric sorbents with macromolecular arrangement favorable for sorption of copper ions have been obtained obtained on the base of copolymer of diethyl ester of vinylphosphonic acid with acrylic acid. The general principle involves interaction of linear polymer and sorbing ions in solution where the segments of the macromolecules are still mobile enough, subsequent fixation of optimal ion uptake conformations of macromolecules by crosslinking of metal polymer complexes, and removal of ions from crosslinked sorbent. Such treatment increases the exchange capacity of the sorbents more than twice and improves essentially its kinetic characteristics in comparison with the same copolymer crosslinked by conventional methods without special arrangement of macromolecules. The rate of the uptake on the sorbents with macromolecular arrangement favorable for ion sorption first increases with increase in the degree of crosslinking and then decreases. Apparently the jise of the crosslinking degree leads to more rigid fixation of the optimum ion uptake conformations of the macromolecules' segments. Further increase of the crosslinking degree alongside with fixation prevents ions from diffusion into the sorbent. 相似文献
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离子液体作为一种新型的绿色溶剂,在重金属离子萃取分离方面较传统的有机溶剂有显著的优势。本文系统综述了近年来使用离子液体萃取重金属离子的研究进展,详细讨论了离子液体萃取重金属离子的原理和影响因素,包括螯合剂浓度、萃取时间、萃取温度、离子液体组成、溶液pH值、金属离子初始浓度、干扰离子以及水/离子液体质量比等。进一步介绍了提高离子液体萃取性能的措施以及金属离子的脱除与离子液体的回收状况,以及该萃取方法在废水处理、重金属离子分析和冶金中的研究与应用现状,最后指出其未来发展方向是合成功能化离子液体、提高萃取效率,以实现其工业化应用。 相似文献