溶胶-凝胶包埋固定化酶的研究

介绍了溶胶-凝胶(sol-gel)包埋法制备固定化酶的基本过程和影响因素,着重论述了S iO2、有机改性硅胶和有机/无机杂化硅胶三类溶胶-凝胶基质材料制备固定化酶的特性和在催化反应中的应用,对溶胶-凝胶包埋法制备高性能固定化酶的发展前景予以展望。     

溶胶-凝胶法制备防腐耐磨杂化涂层的研究进展

有机无机杂化涂层兼有机涂层和无机涂层的双重特点和性能,具有优良的机械性能和阻隔作用,成为材料防护涂层研究的热点。阐述了溶胶-凝胶法合成有机/无机杂化涂层材料的原理和步骤,介绍了有机/无机杂化涂层在材料防腐耐磨方面的研究现状,提出了利用溶胶-凝胶法制备防腐耐磨杂化涂层存在的一些问题。     

溶胶-凝胶杂化涂料的技术原理与最新应用

无机-有机杂化涂层具备无机涂层和有机涂层的双重特点和优异性能,具有广阔的应用前景。本文综述了溶胶-凝胶法(Sol-Gel)合成无机-有机杂化涂层材料的原理和步骤,重点阐述了基于溶胶-凝胶法制备的杂化涂料产品的最新应用,指出了这一研究领域新的应用方向。     

反应烧结碳化硅陶瓷的制备及烧结机理

用溶胶-凝胶法合成的无机／有机杂化材料结合SiC+C混合粉料制成了反应烧结碳化硅陶瓷素坯,并对由这种素坯制成的碳化硅陶瓷进行了物相鉴定和显微结构观察;借助Si-C相图对反应烧结碳化硅的烧结机理进行了研究,分析表明其主要烧结机理为溶解-再沉淀型。     

溶胶-凝胶法制备无机基质/有机杂化光学材料及其光学性能研究

探索一种制备无机基质/有机杂化光功能材料的途径,采用溶胶-凝胶法在无机基质溶胶中分别掺杂自制的5种有机发光材料,制备出透明、均匀的有机-无机杂化发光薄膜,研究其发光行为,探讨发光行为的规律。     

聚丙烯酰胺／二氧化钛杂化材料的合成与表征

以丙烯酰胺为有机相,通过钛酸正丁酯的水解引入二氧化钛无机相,采用溶胶-凝胶法制备了聚丙烯酰胺（PAM）／二氧化钛（TiO2）水溶性高聚物杂化材料。讨论了二氧化钛溶胶质量分数、单体质量分数对聚合反应转化率的影响;对合成的杂化材料进行了红外、热性能表征。实验结果表明,二氧化钛包裹在聚丙烯酰胺内部,同时,合成的杂化材料耐热性能有所提高。     

溶胶-凝胶法制备有机-无机杂化材料研究进展

综述了国内外溶胶-凝胶法制备有机-无机杂化材料的研究进展     

聚氨酯/硅氧烷改性纳米无机杂化材料的研究进展

综述了聚氨酯/硅氧烷改性纳米无机复合杂化材料的研究进展。介绍了硅氧烷溶胶-凝胶法、硅氧烷原位插层无机复合法以及硅烷衍生多面体笼型硅氧烷(POSS)法的制备方法、性能及其应用,展望了有机硅改性新型聚氨酯材料的研究与发展趋势。     

溶胶-凝胶法制备有机-无机杂化纳米级功能材料

概要总结了溶胶-凝胶法制备有机-无机杂化功能材料的一些制备方法,说明了溶胶-凝胶法中存在的问题,并介绍了解决这些问题的研究.     

有机-无机杂化材料制备质子交换膜的研究进展

综述了近年来采用有机-无机杂化材料制备质子交换膜的研究进展，重点介绍了由掺入了质子导电单元或经过磺化的有机-无机杂化材料制得的质子交换膜及由带磺酸基的有机硅通过溶胶-凝胶工艺制备的有机-无机杂化质子材料制得的交换膜，并从制备方法出发分析了每种质子交换膜的性能。     

Preparation and thermal property of poly(methyl methacrylate)/silicate hybrid materials by the in-situ sol-gel process

Summary A type of hybrid material incorporating poly(methyl methacrylate) with tetraethoxysilane (TEOS) has been successfully prepared by using the in-situ sol-gel process. The bonding between the organic phase and inorganic phase involved (3-trimethoxysilyl) propyl methacrylate. The thermal properties of the hybrid materials varied with the acid content, the TEOS content and the molecular weight of polymer were investigated by thermal gravimetric analysis.     

TiO_2聚合物基体杂化热释电材料的制备与性能研究

采用sol-gel方法制备了以改性直接大红4B偶氮染料为生色团,以钛酸正丁酯(TBOT)为无机前驱体的有机/无机杂化聚合物热释电材料。利用红外、紫外、差热分析、原子力等表征手段对该杂化材料进行了分析。结果表明,所制备的杂化材料取向稳定性好,且热释电性能在室温下较好,系数高达1.98×10-6C/cm2K。     

Inorganic/organic nanocomposite coatings: The next step in coating performance

Inorganic/organic hybrid materials have considerable promise and are beginning to become a major area of research for many coating usages, including abrasion and corrosion resistance. Our primary approach is to prepare the inorganic phase in situ within the film formation process of the organic phase. The inorganic phase is introduced via sol-gel chemistry into a thermosetting organic phase. By this method, the size, periodicity, spatial positioning, and density of the inorganic phase can be controlled. An important aspect of the inorganic/organic hybrid materials is the coupling agent. The initial task of the coupling agent is to provide uniform mixing of the oligomeric organic phase with the sol-gel precursors, which are otherwise immiscible. UV-curable inorganic/organic hybrid systems have the advantages of a rapid cure and the ability to be used on heat sensitive substrates such as molded plastics. Also, it is possible to have better control of the growth of the inorganic phase using UV curing. It is our ultimate goal to completely separate the curing of inorganic and organic phases to gain complete control over the morphology, and hence optimization of “all” the coating properties. Thus far, it has been found that concomitant UV curing of the inorganic and organic phases using titanium sol-gel precursors afforded nanocomposite coatings which completely block the substrate from UV light while maintaining a transparent to visible light. Also, it has been found that the morphology of the inorganic phase is highly dependent on the concentration and reactivity of the coupling agent. Presented at the 82nd Annual Meeting of the Federation of Societies for Coatings Technology, October 27–29, 2004, in Chicago, IL.     

紫外光固化块体PMMA/SiO2有机/无机杂化材料

以正硅酸乙酯（TEOS）、甲基丙烯酸甲酯（MMA）为原料,采用溶胶－凝胶法和紫外光固化技术制备块体PMMA/SiO2有机/无机杂化材料,通过透射电镜（TEM）、红外光谱（FTIR）和差热分析（DSC）研究了杂化材料的微观特性和热性能,研究表明该方法制备的二氧化硅溶胶粒径在100 nm左右,分散良好;杂化材料中有机相和无机相是以共价键的形式相互连接的,没有出现有机相和无机相的相分离现象,并且两相之间形成了互穿的网络结构。     

Epoxidized soybean oil-based ceramer coatings

New inorganic/organic hybrid coating containing epoxidized soybean oil were prepared. Three sol-gel precursors [titanium (IV) i-propoxide, titanium (IV) di-i-propoxide bis-acetoacetonate, and zirconium n-propoxide] were utilized as the inorganic phase. Various coating properties, including adhesion, hardness, impact resistance, flexibility and tensile properties, were investigated as a function of sol-gel precursor type and concentration. All ceramer coatings exhibited excellent flexibility and hardness. Tensile strength and hardness increased with sol-gel precursor concentration. A slight decrease in adhesion and impact resistance was observed with increasing precursor content.     

Viscoelastic properties and morphology of sulfonated poly(styrene-b-ethylene/butylene-b-styrene) block copolymers (sBCP), and sBCP/[silicate] nanostructured materials

Self-assembled organic/inorganic hybrid materials were created via domain targeted sol-gel reactions of tetraethylorthosilicate in solution with sulfonated poly(styrene-b-[ethylene-co-butylene]-b-styrene) (sSEBS) copolymers. Dynamic mechanical analyses (DMA) of these hybrid materials suggest that the silicate component preferentially incorporates within the sulfonated polystyrene (PS) domains. An irreversible order-order transition (OOT) for unmodified SEBS, sSEBS, and the organic/inorganic hybrids was identified using DMA in shear mode. The OOT temperature increases with sulfonation as well as by adding a silicate phase by the sol-gel process. The DMA results imply a morphological shift with sulfonation, and reflect modified interactions within and between phases. Atomic force microscopy (AFM) indicated a shift from hexagonally packed cylinders in unmodified SEBS to a lamellar morphology in the sulfonated materials, but silicate incorporation did not affect the morphology or domain dimensions. The latter result is evidence for sol-gel polymerization templating in a self-assembly process. The phase-separated morphology is stable up to the degradation temperature of the polymer and thermogravimetric analysis revealed that the degradation temperature is unaffected by silicate incorporation. Small angle X-ray scattering data are in harmony with the structures revealed by AFM in terms of degree of order and scale of features. These results are largely rationalized in terms of chain mobility restrictions due to hydrogen-bonding interactions between different sulfonated PS blocks, an increase in the PS-ethylene/butylene block mixing parameter, increased interfacial surface tension and chain restrictions posed by inserted silicate nanostructures in the case of the hybrid materials.     

金属涂装预处理技术一些进展

叙述了利用溶胶-凝胶技术制备无机-有机杂化复合涂层的原理和过程,及用于铝合金、不锈钢、镀锌铁板等金属涂装的预处理,革除磷化、铬钝化等污染工序,获得很好效果。并介绍了对汽车、铝型材等涂装实例。对低表面处理涂料发展简况和应用实例也作了简介。