有机硅改性丙烯酸酯核-壳乳液的研制

采用种子乳液聚合法,以丙烯酸异辛酯为壳,MMA为核,MMA和有机硅偶联剂(A-151)为官能性单体,合成了内硬外软的核-壳型有机硅改性丙烯酸酯乳液。讨论了官能性单体、核-壳单体结构、引发剂等对乳液性能的影响。     

弹性乳胶漆和有机硅底面处理剂涂层系统抗氯离子侵蚀性的研究

介绍了弹性乳胶漆和有机硅底面处理剂涂层系统对沿海地区地面工程的钢筋混凝土抗氯离子侵蚀性。     

In situ preparation of recoverable superhydrophobic coatings for various environments

A superhydrophobic coating was synthesized by in-situ reaction of fumed silica nanoparticles and a co-precursor which contains methyltrimethoxysilane (MTMS), propyltrimethoxysilane (PTMS), and diphenyldimethoxysilane (DPDS). The superhydrophobic surface was achieved by the spray of above mixtures on the substrates. Micro/nano structure of the surface was controlled by the silica nanoparticles. The wetting behavior of the surface was enhanced after coated and obtained a maximum 154^o static water contact angle and a minimum 1^o sliding angle. The surface retained its superhydrophobicity as well as good corrosive resistance and adhesion at a high temperature of 460?°C. Damage to the superhydrophobic coatings caused by extremely low temperature or mechanical force could be easily repaired through a heat treatment or a new spray.     

DDS含量对有机硅/SiO_2杂化涂层性能的影响

采用溶胶-凝胶法,以正硅酸乙酯(TEOS)为无机相前驱体,甲基三乙氧基硅烷(MTES)和二苯基二甲氧基硅烷(DDS)为有机相前驱体,盐酸和水为催化剂,通过水解-缩聚反应制备了不同DDS含量的有机硅/SiO_2有机-无机杂化溶胶。在100℃下经12 h烘干得到有机硅/SiO_2杂化涂层。涂层性能测试表明:随DDS含量增加,硬度、附着力、耐蚀性(未加DDS耐蚀性较差)有所下降;柔韧性均为1级。低温下涂层耐热性较好。溶胶中n(TEOS):n(MTES):n(DDS)为6:9:2时涂层综合性能最佳。     

抗高温淀粉降滤失剂的合成及其性能

以六甲基二硅氮烷、苯基有机胺、羧甲基淀粉(CMS)、3-氯-2-羟丙基磺酸钠等为主要原料,制备出抗160℃高温的钻井液用淀粉降滤失剂(HTS)。采用FTIR和DT方法分析了HTS的结构及其热稳定性。表征结果显示,CMS结构上引入了苯基阳离子、有机硅官能团及磺酸基团;HTS的热分解温度为232℃。考察了HTS的淡水钻井液性能、抗高温性能以及耐盐性能。实验结果表明,HTS具有良好的抗高温性能,含HTS的淡水钻井液在160℃滚动16 h前后降滤失性能均优良,且钻井液的流变性能变化较小,与传统的改性淀粉降滤失剂相比,抗高温能力提高近40℃;无论在NaCl含量为4%(w)还是8%(w)的盐水钻井液中,HTS的降滤失性能都较好,说明磺酸基因的引入可提高降滤失剂的耐盐性能。     

Synthesis and optical and thermal properties of poly[methyl(2,9‐diphenyl‐ 7,8‐benzophenanthryl)silylene‐co‐1,4‐bis(methylphenylsilyl)phenylene]

Poly[methyl(2,9‐diphenyl‐7,8‐benzophenanthryl)silylene‐co‐1,4‐bis(methylphenylsilyl)phenylene] (PMBS‐co‐BSP) was synthesized by the condensation reaction of dichloromethyl(2,9‐diphenyl‐7,8‐benzophenanthryl)silane and 1,4‐bis(chloromethylphenylsilyl)benzene with sodium in toluene. Optical and thermal behavior of the polymer was investigated. Because of the introduction of substituted benzophenanthryl groups into the Si atoms of the polymer, the UV absorption wavelength of the PMBS‐co‐BSP red‐shifted significantly in the UV region, and a strong photoluminescence band was observed in the visible region other than the near‐UV photoluminescence typical of normal polysilane. The photochemical behavior was examined both in solution and in thin film by fluorescence and UV spectroscopy. Irradiation of the PMBS‐co‐BSP with a low‐pressure mercury lamp in solution resulted in homolytic scission of silicone–silicone bonds; the fluorescence emission intensities decreased gradually with increasing UV irradiation time and the maximum emission wavelength blue‐shifted significantly. Irradiation of thin solid films of the PMBS‐co‐BSP in air led to the formation of photoproducts containing Si? OH and Si? O? Si groups. The PMBS‐co‐BSP began to weigh less at about 300 °C and the weight loss of the polymer at 700 °C was calculated to be 75% of the initial weight in N₂. Copyright © 2006 Society of Chemical Industry     

紫外光聚合法合成有机硅改性苯丙微乳液

以丙烯酸丁酯和苯乙烯为单体、γ-甲基丙烯酰氧丙基三甲氧基硅烷为偶联剂和交联剂、十二烷基硫酸钠为表面活性剂、正戊醇为助表面活性剂、米氏酮和二苯甲酮为光引发剂,采用紫外光聚合法在室温下合成有机硅改性苯丙微乳液;考察了该微乳液的耐酸碱性能;采用傅里叶变换红外光谱、热重分析、透射电子显微镜、紫外-可见分光光度计等方法对该微乳液及其涂膜的结构、形貌、光学和热学性能进行了表征。实验结果表明,有机硅改性苯丙微乳液的耐酸性好于耐碱性;该微乳液为透明或半透明状,单体含量为20g(在100g水中)的微乳液在550nm处的透光率达55%,在760nm处的透光率可达87%;粒径为34～55nm,粒径分布指数为1.16～1.18。表征结果显示,所合成的产物为有机硅改性的苯乙烯与丙烯酸丁酯的共聚物。     

农用有机硅表面活性剂的研究进展

有机硅表面活性剂作为农用助剂近年来发展迅速,由于其卓越的润湿性能,被喻为“超润湿剂”。本文对农用有机硅表面活性剂的结构特性及其合成工艺以及其不足进行了综述。     

壳聚糖有机硅表面活性剂的研究进展

壳聚糖是一种天然的阳离子聚合物,有着良好的物理、化学性能和生物兼容性;有机硅表面活性剂有好的表面活性;壳聚糖和有机硅表面活性剂应用广泛。本文就壳聚糖有机硅复合材料在食品工程、生物工程、工业环保、农业、针织等方面的应用进行了综述。     

有机硅改性丙烯酸乳液的研究进展

综述了近几年来有机硅改性丙烯酸乳液的新进展,介绍了其改性的方法,着重讨论了聚合方法、有机硅单体、乳化剂等因素对乳液聚合及涂膜性能的影响。