有机-无机杂化复合材料的合成、表征和热学性质

丙烯酸乙酯(EA)、甲基丙烯酸甲酯(MMA)、苯乙烯(St)、及丙烯酸丁酯(BA)分别和含烷氧基硅烷单体甲基丙烯酰氧基三甲氧丙基硅烷以一定比例通过自由基共聚反应制得共聚物前驱体,将TEOS在HCl催化剂作用下水解、缩合形成SiO2,然后由共聚物和SiO2通过溶胶-凝胶法合成杂化复合材料,制得的复合材料膜有较好的光学透明性,其透光率在79%以上.利用傅立红外光谱分析了杂化材料的化学结构.溶胶抽取结果表明,在杂化材料中凝胶的含量较高,对它们的形貌特性和研究结果表明:在聚合物基体中SiO2具有较好的分散性,有机-无机相相互贯穿.     

新型低含量羟基有机-无机杂化材料的合成

采用二苯基二羟基硅烷分别和两种不同的硅烷偶联剂γ-甲基丙烯酰氧基丙基三甲氧基硅烷、γ-缩水甘油醚氧丙基三甲氧基硅烷作为先驱体,用无水溶胶-凝胶法合成出有机-无机杂化材料,将其旋涂在硅基片和石英玻璃片上得到杂化光学薄膜.用Fourier红外光谱仪和Raman光谱仪测试了薄膜的红外吸收光谱和Raman散射光谱,用Abbe折...     

铝合金表面新型有机-无机杂化纳米SiO2涂层的制备及其性能

为了提高铝合金的耐腐蚀性能、耐磨损性能及硬度,通过溶胶-凝胶反应,以纳米硅溶胶为主要原料,有机硅烷为偶联剂,制备了新型纳米SiO2防腐蚀涂料.通过浸渍-提拉法在铝合金(LY12)基体表面形成涂层,通过改变硅溶胶的含量,详细研究了此涂层的显微硬度、耐磨性能和耐腐蚀性能与硅溶胶含量的关系.结果显示,新型有机-无机杂化纳米SiO2涂层厚度为20μm时具有良好的耐腐蚀性能和耐磨性能,由此而使此杂化膜替代对环境有害的铬酸盐转化膜成为可能,并为有机-无机杂化纳化材料的应用提供了理论依据.     

铝合金表面新型有机-无机杂化纳米Si02涂层的制备及其性能

为了提高铝合金的耐腐蚀性能、耐磨损性能及硬度,通过溶胶-凝胶反应,以纳米硅溶胶为主要原料,有机硅烷为偶联剂,制备了新型纳米SiO2防腐蚀涂料。通过浸渍-提拉法在铝合金（LY12）基体表面形成涂层,通过改变硅溶胶的含量,详细研究了此涂层的显微硬度、耐磨性能和耐腐蚀性能与硅溶胶含量的关系。结果显示,新型有机-无机杂化纳米SiO2涂层厚度为20μm时具有良好的耐腐蚀性能和耐磨性能,由此而使此杂化膜替代对环境有害的铬酸盐转化膜成为可能,并为有机-无机杂化纳化材料的应用提供了理论依据。     

二氧化硅基有机-无机防腐蚀杂化膜的制备及性能

传统的钢铁表面覆膜技术如磷化、铬酸盐钝化等污染严重,硅烷化和有机-无机杂化涂层用于金属预处理则具有耐温、耐腐蚀等优点,又利于环保.以正硅酸乙酯、γ-氨丙基三乙氧基硅烷为原料,采用溶胶.凝胶法制备了SiO2基有机-无机杂化材料.通过红外光谱对不同温度处理的杂化材料进行了分析,以差示扫描量热法研究了杂化材料在不同温度下的吸放热反应,结合对杂化溶胶涂覆于钢铁基体表面形成涂层的塔菲尔曲线分析,对杂化膜的保护性能进行了研究.结果表明:涂层试样在N2气氛下300℃热处理,可以保证涂层中Si-O-Si键等最大程度地键合,并有效保留了有机组分,从而有利于保证杂化材料涂层的完整性,较大地提高了基体钢铁的耐腐蚀性能,可作为金属表面涂装处理工序中良好的中间过渡层.     

有机-无机杂化材料研究进展

综述了有机－无机杂化材料的制备方法及影响材料结构和性能的因素,并对有机－无机碳化材料在力学,光学,电学等领域的应用进行了简要的评述。这类性能优异的新材料在未来的高科技领域必须有广阔的应用前景。     

溶胶-凝胶法制备有机-无机杂化光波导材料研究进展

有机-无机杂化材料因同时具有有机功能基团和无机功能基团的结构特点而易于有机光活性物质和无机活性物质的掺杂已被人们广泛关注和大力研究.溶胶-凝胶法是制备有机-无机杂化光波导材料的主要方法.阐述了溶胶-凝胶法制备杂化材料的原理,比较了几种目前研究得较多的有机-无机杂化光波导材料体系,指出了各自的优缺点,介绍了杂化材料制备光波导器件的工艺流程,最后归纳了溶胶-凝胶法制备有机-无机杂化光波导材料过程中存在的问题.     

PMTES/SiO2有机-无机杂化材料的研究

以甲基三乙氧基硅烷（ＭＴＥＳ）正硅酸乙酯（ＴＥＯＳ）为原料,采用溶胶－凝胶工艺制备出均质透明的ＰＭＴＥＳ／ＳｉＯ２杂化玻璃,并进行ＩＲ,ＤＴＡ,ＴＧ,ＳＥＭ测定,结果表明,该杂化玻璃的耐热性比有机玻璃优点,耐４００℃高温,具有疏水透气性能,可用于文物陈列和水产养殖业。     

溶胶-凝胶法制备有机/无机杂化材料研究进展

综述了溶胶-凝胶法制备有机／无机杂化材料的途径和产物的结构特征,并对有机／无机杂化材料进行了分类;阐述了溶胶-凝胶法制备有机／无机杂化材料的基本原理和步骤。     

基于复合纳米颗粒的有机-无机杂化膜制备与性能表征

采用共混杂化的方法,利用Al2O3/TiO2复合纳米颗粒对疏水性强、易污染的聚偏氟乙烯膜进行改性,以增强其在水相溶液中的应用能力。通过测定纯水通量、截留率和膜表面接触角分别考察膜的透过、分离性能及亲疏水性能。用扫描电镜观察杂化膜的表面形态及断面结构。用傅立叶红外光谱分析杂化膜的化学结构,用X射线衍射分析杂化膜的结晶状态。膜的抗污染性能由料液通量试验考察。改性前后膜的测试结果表明,纳米颗粒的加入改善了聚偏氟乙烯膜的通量、亲水性能和抗污染性能。     

POSS基有机-无机杂化高分子的制备及低介电性能

利用硅氢加成反应技术，以多面低聚倍半硅氧烷T8H8和二（对烯丙氧基苯甲酸）丁二醇酯为单体合成了有机．无机杂化交联聚合物。用FTIR和^29Si NMR等对材料进行了结构表征，结果表明，在聚合物中两种单体以化学键相连，无机与有机相均匀分散，T8H8分子中平均有6.3个Si-H键与C=C双键发生了加成反应，得到了三维网络聚合物。TGA分析结果表明，聚合物具有较高的热稳定性，热分解温度为376℃。Ellipsometer测试结果表明，聚合物薄膜具有较低的介电常数，k值为2．4。薄膜表面经三甲基氯硅烷疏水处理后，k值减小为2．2。     

Germania-based, sol-gel hybrid organic-inorganic coatings for capillary microextraction and gas chromatography

Germania-based, sol-gel hybrid organic-inorganic coatings were developed for capillary microextraction and gas chromatography (GC). Being an isostructural analogue of SiO2, GeO2 is compatible with the silica network. Because of this similarity, germania-based materials possess great potential for being used in the areas of chromatographic separation and sample preparation. These possibilities, however, remain practically unexplored. To our knowledge, this is the first instance that a germania-based hybrid sol-gel material is used as a sorbent in analytical sample preparation or chromatographic separation. Tetramethoxygermane was used as a precursor to create a sol-gel network via hydrolytic polycondensation reactions performed within a fused-silica capillary. The growing sol-gel germania network was simultaneously reacted with an organic ligand that contained sol-gel-active sites in its chemical structure. Three different sol-gel-active ligands were used: (a) hydroxy-terminated poly(dimethylsiloxane), (b) hydroxy-terminated poly(dimethyldiphenylsiloxane), and (c) 3-aminopropyltrimethoxysilane. Sol-gel germania-coated capillaries of desired polarity and extraction selectivity were prepared by using an appropriately selected sol-gel-active ligand in the sol solution. These capillaries were further used to extract trace concentrations of polycyclic aromatic hydrocarbons, aldehydes, ketones, alcohols, phenols, and free fatty acids from aqueous samples. The extracted solutes were further analyzed by GC-FID. The new germania-based coatings showed excellent stability under harsh operation conditions involving extreme pH values, high temperatures, and aggressive solvents. Our preliminary results also indicate that sol-gel hybrid germania coatings have the potential to offer great analytical performance as GC stationary phases.     

溶胶-凝胶技术制备光化学杂化材料

溶胶 -凝胶技术是制备有机 -无机杂化材料的重要手段 ,在光致变色、光纤传感和发光等光化学杂化材料制备方面应用前景广阔。提高光致变色染料的稳定性、制备溶胶 -凝胶光纤及降低杂化材料羟基含量是目前的研究重点。     

Deposition of hybrid organic-inorganic composite coatings using an atmospheric plasma jet system

The objective of this study is to investigate the influence of alcohol addition on the incorporation of metal oxide nanoparticles into nm thick siloxane coatings. Titanium oxide (TiO2) nanoparticles with diameters of 30-80 nm were incorporated into an atmospheric plasma deposited tetramethylorthosilicate (TMOS) siloxane coating. The TMOS/TiO2 coating was deposited using the atmospheric plasma jet system known as PlasmaStream. In this system the liquid precursor/nanoparticle mixture is nebulised into the plasma. It was observed that prior to being nebulised the TiO2 particles agglomerated and settled over time in the TMOS/TiO2 mixture. In order to obtain a more stable nanoparticle/TMOS suspension the addition of the alcohols methanol, octanol and pentanol to this mixture was investigated. The addition of each of these alcohols was found to stabilise the nanoparticle suspension. The effect of the alcohol was therefore assessed with respect to the properties of the deposited coatings. It was observed that coatings deposited from TMOS/TiO2, with and without the addition of methanol were broadly similar. In contrast the coatings deposited with octanol and pentanol addition to the TMOS/TiO2 mixture were significantly thicker, for a given set of deposition parameters and were also more homogeneous. This would indicate that the alcohol precursor was incorporated into the plasma polymerised siloxane. The incorporation of the organic functionality from the alcohols was confirmed from FTIR spectra of the coatings. The difference in behaviour with alcohol type is likely to be due to the lower boiling point of methanol (65 degrees C), which is lower than the maximum plasma temperature measured at the jet orifice (77 degrees C). This temperature is significantly lower than the 196 degrees C and 136 degrees C boiling points of octanol and pentanol respectively. The friction of the coatings was determined using the Pin-on-disc technique. The more organic coatings deposited with octanol and pentanol exhibited friction values of 0.2, compared with approx. 0.8 for the coatings deposited from TMOS/TiO2 mixture (with and without methanol). Wear performance comparison between the two types of coating again indicated a significant organic component in the coatings deposited from the higher boiling point alcohols.     

Preparation and optical limiting properties of a POSS-containing organic-inorganic hybrid nanocomposite

A novel POSS-containing organic-inorganic hybrid nanocomposite (P) was prepared by the Pt-catalyzed hydrosilylation reaction of octahydridosilsesquioxane (T₈^H) with substituted acetylene, CH≡CCH₂O-C₆H₄-COO-C₆H₄-p-NN-C₆H₄-p-OCH₃ (M). The hybrid nanocomposite was soluble in common solvents such as CHCl₃, THF, toluene and C₂H₄Cl₂. Its structure was characterized by FT-IR, ¹H NMR, and ²⁹Si NMR, respectively. Optical limiting property was evaluated by a Q-switched Nd:YAG laser system with a wavelength of 532 nm, 4 ns pulse width and a repetition of 1 Hz. The result shows that the POSS-based organic-inorganic hybrid nanocomposite exhibits novel optical limiting property, well photo and high thermal stability (T_d, temperature for 5% weight loss, as high as 319 °C). The optical limiting property increases with the increase of solution concentration.     

聚醚胺固化环氧有机硅杂化涂层的制备及防腐蚀性能研究

使用3种不同结构的聚醚胺(Jeffamine D230,D400,T403)分别固化环氧有机硅杂化树脂制备出有机-无机杂化涂层,并与3-氨丙基三乙氧基硅烷(APTES)固化的杂化涂层在机械性能、附着力和防腐蚀性能上进行了比较。研究结果表明,与APTES相比,聚醚胺可以提高杂化涂层的耐冲击高度1倍以上;聚醚胺D230和T403没有降低杂化涂层的硬度,而D400降低了杂化涂层的硬度;聚醚胺可以明显提高杂化涂层的初始附着力,同时大幅改善了涂层在老化过程中的"湿附着力"。采用盐雾实验和交流阻抗测试研究了杂化涂层的耐腐蚀性能,结果表明聚醚胺固化剂明显改善了APTES固化杂化涂层的易开裂性,并提高了杂化涂层的耐腐蚀性能。     

含季铵荷电基团的有机-无机杂化介孔材料的合成与表征

以十二烷基硫酸钠(SDS)为模板剂,正硅酸乙酯(TEOS)和N-三甲氧基硅丙基-N,N,N-三甲基氯化铵(TSPMNC)为硅源,以NaOH为催化剂,合成出带有季铵荷正电基团的有序介孔材料(QAS)。采用XRD,TGA、BET、SEM,XPS、TEM、FT-IR等手段对产品结构进行了表征和分析。结果表明,产品具有较为均一的六方介孔结构,孔径约为3.5nm,产品中季铵荷电基团的含量约为1.41mmol/g。     

新型POSS基有机/无机纳米杂化材料的制备及光限幅性能研究

以二苯乙烯衍生物4-乙炔基-4′-硝基二苯乙烯(ENS)和POSS(T8H)为原料,通过钯催化硅氢化反应制备了POSS基有机/无机纳米杂化复合材料(POSS-ENS),并用IR、1H NMR、29Si NMR、UV-vis对其结构进行了表征.同时,对材料的光限幅性能和热性能进行了测试,结果表明,纳米杂化复合材料不仅对532nm、4ns脉宽的激光具有良好的光限幅效应,而且具有很好的光学稳定性和热稳定性能.