有机硅改性丙烯酸酯乳液

复旦大学的游波等通过乳液聚合制备出有机硅改性丙烯酸酯乳液。乳液中的有机硅分子在催化剂作用下与基材表面的羟基脱水交联 ,使粘接力大大提高。研究了有机硅单体用量及丙烯酸交联单体对乳液性能的影响 ,结果表明 :有机硅单体质量分数为 8%时 ,乳液的综合性能最好 ,其耐水性、抗粘性、附着力、拉伸强度等均得到提高 ;加入丙烯酸单体Ａ ,可起催化剂作用 ,使共聚乳液交联度增加、粘接性提高 ,以苯乙烯代替部分甲基丙烯酸甲酯 ,不会影响乳液稳定性和质量 ,可降低成本。有机硅改性丙烯酸酯乳液     

烯烃基碳硅氧烷树枝状大分子单体及其应用

概述了烯烃基碳硅氧烷树枝状大分子单体的结构,介绍了层级为1和层级为2的烯烃基碳硅氧烷大分子单体的合成方法及结构表征,以及烯烃基碳硅氧烷树枝状大分子单体在有机聚合物改性及化妆品领域的应用,如:与有机单体溶液共聚制备有机硅改性共聚物、与丙烯酸酯单体乳液共聚制备有机硅改性丙烯酸酯乳液、与长链烷基丙烯酸酯共聚制备化妆品成膜剂、与甘油或木糖醇共改性制备亲水性有机硅交联共聚物等。     

有机硅氧烷对光油乳液性能的影响

文章介绍了一种采用核壳共聚工艺制备经有机硅氧烷改性的苯丙型光油乳液的方法,重点讨论了聚合工艺、乳化剂、有机硅氧烷对乳液性能的影响。结果表明,采用核壳共聚工艺、合理控制反应条件;乳化剂的用量为单体总量的3.25%;有机硅氧烷A-1706适于作为交联单体,合理用量为0.6%,可以明显提高乳液的性能。     

氟硅改性丙烯酸弹性乳液的研制

将有机硅单体、有机氟单体与丙烯酸酯类单体进行共聚,采用无皂核壳乳液聚合技术制备了一种高性能氟硅改性丙烯酸弹性乳液,研究了聚合工艺、引发剂浓度、功能单体、交联单体等因素对乳液性能的影响。结果表明,氟硅改性丙烯酸弹性乳液性能优于常规弹性乳液,用其制备的弹性涂料拉伸性能及耐沾污性好。     

有机硅改性丙烯酸乳液性能的研究

采用含乙烯基官能团的有机硅单体与甲基丙烯酸酯、丙烯酸酯和丙烯酸羟基酯等单体通过种子乳液聚合方法进行共聚,合成了有机硅改性丙烯酸酯共聚乳液,考察了有机硅单体用量对乳液机械稳定性、热稳定性、电解质稳定性和冻融稳定性的影响,同时还考察了乳液胶膜的机械性能和吸水率改进。     

有机硅、云母改性丙烯酸酯互穿网络阻尼材料的制备及性能研究

采用半连续乳液聚合的方法,在以丙烯酸酯类单体为主的二元互穿网络中加入有机硅单体与乳液进行共聚,得到了性能稳定的有机硅丙烯酸酯共聚乳液,并在乳液中加入了无机填料(绢云母)。考察了有机硅单体的用量对合成乳液及其胶膜性能的影响,通过红外光谱分析,证明了有机硅单体和丙烯酸酯单体的共聚。通过透射电镜(TEM)对乳胶粒子的观察,分析了有机硅单体及云母对乳液乳胶粒子形态结构的影响。通过动态粘弹仪(DMA)对材料的动态力学性能进行测试得到,Tanδ>0.3的温度范围为:-65～150℃。     

有机硅改性丙烯酸酯共聚乳液的合成及表征

采用间歇和种子半连续乳液聚合方法合成有机硅改性丙烯酸酯(硅丙)共聚乳液,用激光粒度仪、透射电子显微镜、差示扫描量热仪、表面张力仪等分析了硅丙共聚乳液和涂层的性能。采用种子半连续乳液聚合和间歇乳液聚合均可得到具有核-壳结构的硅丙共聚乳液。半连续乳液聚合得到的硅丙共聚乳液的粒径较小,粒径分布窄;采用半连续滴加纯丙烯酸酯单体和滴加单体预乳液对共聚乳胶粒子的平均粒径及粒径分布、形态影响不大。采用间歇乳液聚合可使有机硅单体的开环聚合和丙烯酸酯单体的自由基聚合同时进行,获得的硅丙乳液稳定性好,但聚合转化率偏低,乳胶粒子粒径较大,粒径分布较宽。硅丙共聚乳液胶膜的吸水率小于纯丙烯酸酯聚合物乳液胶膜,并随有机硅共聚率的增加而降低;硅丙乳液胶膜的接触角接近有机硅接触角。硅丙共聚乳液涂层整理的织物手感优异,但涂层牢度小于纯丙乳液整理剂。     

有机硅改性丙烯酸酯乳液的合成及性能研究

采用有机硅氧烷与丙烯酸酯单体共聚制备有机硅改性丙烯酸酯乳液,研究了有机硅单体用量、乳化剂配比和温度等因素对乳液的影响,并对涂膜性能进行了测试。研究结果表明,有机硅与丙烯酸酯单体能很好地聚合,且制备出的乳液性能优异,可以作为高性能外墙涂料的基体树脂。     

有机硅-丙烯酸酯共聚乳液

华南理工大学的柯跃虎等人以甲基丙烯酸甲酯、丙烯酸丁酯、丙烯酸、有机硅单体等为原料,采用半连续乳化乳液聚合工艺,合成出核壳结构的有机硅改性共聚乳液。在有机硅单体用量5 %、引发剂用量0 6%、核壳中乳化剂配比1∶2、反应温度80℃的条件下合成的乳液性能最佳。FTIR谱图分析表明,有机硅单体在聚合过程中已接枝成为共聚物的一部分,有机硅单体的引入明显地改善了乳液的诸多性能有机硅-丙烯酸酯共聚乳液     

有机硅-丙烯酸酯弹性乳液的制备与研究

采用有机硅氧烷与丙烯酸酯单体共聚制备有机硅改性丙烯酸酯弹性乳液,研究了有机硅单体、乳化剂用量及配比等因素对乳液的影响,并对涂膜进行了兀'一IR表征.研究结果表明有机硅与丙烯酸酯单体能很好地聚合,且制备出的乳液性能优异,可以作为高性能外墙弹性涂料的基体树脂.     

Faser-matrix-haftung in kunststoffverbunden aus thermoplastischer matrix und flachs. 1. Die ausrüstung mit silanen

Because of their properties, flax fibres can be used as reinforcing material in composites, e. g. as substitute for glass fibres in composites with polypropylene. A major drawback of this application is the high water adsorption of the natural fibre and its low adhesion to the hydrophobic polymer. Therefore, improvement of adhesion to the polypropylene matrix by application of bifunctional silanes was investigated. While silanes with alkyl groups did not significantly improve the fibre-matrix adhesion, it was found that silanes which carry functional groups capable of reacting by formation of free radicals under processing conditions lead to a remarkable improvement. For silanes with vinylic and methacrylic groups, the dependence of adhesion on the nature of hydrolysis catalyst, on the compound which initiates the free-radical reaction, and on the degree of fibre silylation was investigated. The degree of silylation was varied under optimum concentration conditions.     

Nonreinforcing filler–elastomer systems. II. Silane–treated ammonium perchlorate in polybutadiene

The adhesion between ammonium perchlorate filler and the polybutadiene rubber matrix was investigated. The aggregate composite was modified by surface pretreatment of the filler with various organofunctional silanes. For comparison, the adhesion of glass beads and glass powder, each coated with a fluorocarbon release agent, and carbon black were used as fillers in the cured polybutadiene matrix. Common testing methods used included the determination of Poisson's ratio, photographic analysis, and absorption of water. A new type of stress–strain analysis was introduced. Results closely agreed with established composite theory. The presence of methacryloxy- and amino-functional silanes improved adhesion to the resin system. Epoxy- and vinyl functional silanes proved to be detrimental at the filler–rubber interface. A major function of the coupling agents appears to be to eliminate the weak boundary layer of surface moisture on the filler particles.     

Synthesis and properties of styrene–butylacrylate emulsion copolymers modified by silane compounds

Styrene (St)/butyl acrylate (BA) copolymers were prepared by adding triethoxyvinylsilane (TEVS), trimethoxyvinylsilane (TMVS), and triphenylvinylsilane (TPVS), each one through emulsion copolymerization. The polymerization was performed with methacrylic acid and auxiliary agents at 80°C in the presence of potassium peroxodisulfate as the initiator. Nonylphenol ethylene oxide‐40 units (NP‐40) and sodium lauryl sulfoacetate were used as nonionic and anionic emulsifiers, respectively. The resulting copolymers were characterized by using Fourier transform infrared spectroscopy. Thermal properties of the copolymers were studied by using thermogravimetric analysis and differential scanning calorimetry. The morphology of copolymers was also investigated by optical microscopy, and then the effects of silicone kinds and concentrations on the properties of the St/BA emulsion copolymers were discussed. The obtained copolymers have high solid content (50 %) and can be used in emulsion paints as a binder. The comparison of three different vinyl silanes indicates that the TEVS influences on the copolymer properties more than the others. The calculations of monomer conversion and monomer conversion versus time histories indicate that by increasing the silicone concentration, the polymerization rate decreases. © 2009 Wiley Periodicals, Inc. J Appl Polym Sci, 2009     

功能性丙烯酸酯乳液的制备与应用研究进展

介绍了核-壳乳液聚合、乳液互穿聚合物网络、无皂乳液聚合、微乳液与细乳液聚合等方法与技术在制备功能性丙烯酸酯乳液中的应用。阐述了有机硅、有机氟、聚氨酯、环氧树脂等改性方法用于制备功能性丙烯酸乳液的研究进展。详细介绍了功能性丙烯酸乳液在功能涂料、胶黏剂、皮革涂饰剂、油墨等领域的应用现状,提出了功能性丙烯酸酯乳液的发展趋势：采用新的聚合技术、改性技术制备具有附加值高、性能优异且环境友好的水性功能性乳液是今后丙烯酸酯乳液的主要发展方向。     

丙烯酰胺改性丙烯酸酯乳液的合成及性能研究

通过预乳化半连续法制备了丙烯酰胺(AM)改性的丙烯酸酯乳液,探讨了功能单体AM用量对丙烯酸酯乳液和乳液胶膜性能的影响。结果表明:当AM用量为单体质量的1.0%时,乳液及乳液胶膜的综合性能最好。此时,功能单体AM改性的丙烯酸酯乳液聚合稳定性和转化率有所提高;乳液胶膜的力学性能有较大幅度的提高,吸水率有一定程度的降低。     

功能单体对丙烯酸酯乳液性能的影响

用功能单体衣康酸单丁酯(MBI)通过半连续法合成了水性涂料用丙烯酸酯乳液,探讨了功能单体MBI用量的变化对丙烯酸酯乳液性能的影响.结果表明:与功能单体AA制得的丙烯酸酯乳液相比,用功能单体MBI制备丙烯酸酯乳液时,乳液的聚合稳定性及化学稳定性好,粒子呈现规整的球形结构.当功能单体MBI的用量为4%时,制得的乳胶膜的耐水性最好,黏度最低.     

Role of interfacial adhesion strength on toughening polypropylene with rigid particles

The effects of interfacial adhesion strength on the mechanical properties of composites of polypropylene and glass particles were investigated. The 3.5 μm average diameter glass particles were surface-treated using two silanes with different functional groups. The functional groups were hydrocarbons, expected to promote adhesion between filler and matrix, and fluorocarbons, expected to reduce the strength of adhesion. Mixtures of the functional groups were also used to treat the surface of the glass to obtain better control of adhesion strength and thus the mechanical properties of the composites. A model study using glass slides and polypropylene films was conducted to confirm the feasibility of treatment. Adhesion strength between glass and polypropylene increased with increasing coverage of the hydrocarbon silanes. The surface-modified particles were incorporated into the polypropylene matrix via melt processing. While surface functionalization of the particles can influence the dispersion of the particles, no significant effect was observed in this study. Tensile tests and toughness tests were performed on injection-molded samples. The tensile strength of the reinforced polypropylene increased with increasing adhesion strength. Impact toughness increased with weaker adhesion but the dependence became less pronounced as deformation rate was increased.     

水性含氟耐候防锈涂料的制备及应用

采用核壳乳液聚合法,并加入磷酸酯功能单体(PAM-100),制备了氟单体用量为5%的含氟丙烯酸酯聚合物乳液。分析了含氟单体、乳化剂、磷酸酯功能单体等因素对乳液合成的影响。用合成的乳液配制了水性防锈涂料,并对其性能进行测试。     

功能单体改性苯丙乳液的合成研究

采用甲基丙烯酸脲杂环和反应型有机硅为功能单体、过硫酸钾为引发剂,对苯丙乳液进行改性及合成研究;并对实验工艺、乳化剂的配比、引发剂的浓度、不同功能单体对苯丙乳液性能的影响进行讨论分析。结果表明,当十二烷基苯磺酸钠：辛基酚聚氧乙烯醚质量比为2：1时,过硫酸钾含量为单体总量的0．6％时,可以合成性能优良的改性苯丙乳液。     

聚丙烯酸酯乳液复合改性水性聚氨酯胶粘剂的研究

研究了一种聚丙烯酸酯乳液复合改性水性聚氨酯胶粘剂的方法,以及聚丙烯酸酯的玻璃化温度Tg、功能单体等改变对改性后的PUA复合乳液的粘接性能的影响。结果表明：聚丙烯酸酯乳液的分子结构不同对复合乳液的粘接性能影响很大,通过改变聚丙烯酸酯乳液的用量、Tg、羟基含量、羧基含量等可以得到综合性能更优的复合乳液。