聚硅氧烷表面改性二氧化钛粒子及超疏水性能

为了提高二氧化钛的疏水性，解决无机二氧化钛填料在有机溶剂中的分散性、相容性等问题，采用含氟含氢乙烯基聚硅氧烷（F-PMHS）对二氧化钛粉体进行表面改性，得到具有超疏水性能的改性二氧化钛。通过FT-IR、TGA、SEM、接触角测试、沉降实验等方法研究改性后二氧化钛粒子的结构，测试其超疏水性能，分析超疏水表面形成的机理。结果表明，F-PMHS相对二氧化钛粉体质量分数仅为8%时，改性后二氧化钛粉末涂层与水的静态接触角即可达152.4°，具有良好的超疏水性能，且二氧化钛粒子在有机溶剂中的分散性与相容性得到显著提高。     

硅烷偶联剂表面改性二氧化钛粒子超疏水性能

针对无机二氧化钛(TiO2)粒子在有机体系中的分散性问题,采用硅烷偶联剂KH-570对无机填料钛白粉(二氧化钛,TiO2)的表面进行有机化改性;并通过红外光谱(FTIR)、接触角测试、沉降实验、扫描电子显微镜(SEM)等手段表征表面改性TiO2粒子的结构,测试其超疏水性能,分析超疏水表面形成的机理。结果表明,经KH-570表面改性的TiO2粒子的疏水性和分散性得到明显改善,当KH-570质量分数达到15%时,表面改性的TiO2涂层与水的静态接触角达152.5°,表现出良好的超疏水性能。     

硅烷偶联剂表面改性二氧化钛粒子超疏水性能研究

针对无机二氧化钛（TiO2）粒子在有机体系中的分散性问题,采用硅烷偶联剂KH-570对无机填料钛白粉（二氧化钛,TiO2）的表面进行有机化改性;并通过红外光谱（FT-IR）、接触角测试、沉降实验、扫描电子显微镜（SEM）等手段表征表面改性TiO2粒子的结构,测试其超疏水性能,分析超疏水表面形成的机理。结果表明,经KH-570表面改性的TiO2粒子的疏水性和分散性得到明显改善,当KH-570质量分数达到15%时,表面改性的TiO2涂层与水的静态接触角达152.5˚,表现出良好的超疏水性能。     

改性SiO2/聚硅氧烷无氟超疏水涂层的制备及性能

为了提高基体材料的防污能力,在基体表面制备了一种无氟超疏水复合涂层。首先,使用十六烷基三甲氧基硅烷(HDTMS)对二氧化硅(SiO_2)微纳米颗粒进行疏水改性,其次,将改性后的SiO_2颗粒与有机硅烷混合,利用硅烷的水解、聚合在基体材料的表面得到一层稳定的无氟超疏水复合涂层。采用FTIR、TGA、SEM、AFM和接触角测量仪对涂层的化学组成、表面微观结构和疏水性能进行表征。结果表明:复合涂层表面具有微纳米尺度的粗糙结构,并具有优异的自清洁性和耐磨损性;未磨损前接触角达151°,磨损100周次后接触角进一步提高至161°。     

PE基聚硅氧烷/改性SiO2超疏水薄膜的构筑

使用十八烷基三甲氧基硅烷(OTMS)对纳米SiO2进行表面疏水改性,将得到的改性纳米SiO2(OTMS-SiO2)添加到有机硅树脂(SI)中,然后采用两步法在聚乙烯(PE)薄膜表面固化制备了复合涂层SI/OTMS-SiO2.通过FTIR、1HNMR、29SiNMR、TGA对OTMS-SiO2及复合涂层进行了表征,采用接触角测量仪、SEM、AFM对复合涂层疏水特性和形貌进行了测试和观察,最后对复合涂层的耐磨性和附着力进行了分析.结果表明,SiO2表面成功引入了OTMS,且OTMS-SiO2均匀附着在硅树脂涂层上,增加了表面粗糙度,得到了PE基固化超疏水复合涂层.当OTMS-SiO2添加量为正己烷质量的8％时,制得的复合涂层的水接触角为154°,滚动角为7°,并具有良好的耐磨性,其附着力可达4A等级.     

改性SiO_2粒子制备超疏水表面的研究

通过改性SiO2粒子和其他几种物质共混配制涂料,在PVC膜材上进行涂层烘干并焙烘,获得超疏水涂层表面。讨论了几种物质的用量对表面性能及形态的影响;初步探索了表面微结构对接触角的影响。利用改性SiO2粒子成功制备出了超疏水表面;获得了最佳涂层工艺条件;结构的粗糙度对接触角有着直接的影响。     

超疏水表面研究进展

超疏水表面由于其独特的润湿性,在自清洁等领域具有非常重要的作用。本文阐述了超疏水表面的研究背景、制备超疏水表面的基本方法和含氟及无氟超疏水表面的最新研究进展,总结了当前超疏水表面仍需解决的问题并提出了建议,最后对未来绿色环保的超疏水表面进行了展望。     

室温下ZnO超疏水表面的制备及其油水分离性能

利用简便的液相法,在室温下于不锈钢网上沉积ZnO纳米片和纳米花粗糙结构,接着通过浸渍硬脂酸制备了超疏水不锈钢网.对沉积后的不锈钢网表面形貌、晶体结构、润湿性能、耐磨性能、油水分离性能等进行表征与测定.结果表明,该不锈钢网表面由纳米片和纳米花组成的微纳米结构ZnO构成,具有超疏水性,水接触角为161°;油水分离效率达98...     

高密度聚乙烯超疏水膜疏水性能的研究

在优化高密度聚乙烯(HDPE)超疏水膜制备工艺的基础上,分别加入纳米二氧化钛(nano-TiO2)颗粒和微米级聚苯乙烯(PS)球对超疏水膜进行改性。研究表明:nano-TiO2更适宜作为HDPE超疏水膜的改性剂,当其添加量为8%时,超疏水膜的硬度显著提高且同时保持较好的超疏水特性。PS虽与HDPE相容性较好,但易在良溶剂的影响下对超疏水膜表面的微观结构产生不利影响,从而降低超疏水膜的自清洁性能。     

纳米TiO2的表面改性研究

以硅烷偶联剂为改性剂,通过平行实验和正交实验研究了纳米TiO2有机化表面改性的影响因素。结果表明,硅烷偶联剂用量为10％、pH值为6、改性时间为1．0～1．5h,改性后的纳米TiO2的亲油化度达到74．2％,并能较好地分散于二甲苯和环己烷中。     

Surface modification of silica particles assisted by CO2

This paper reports the synthesis of coating silica particles, in order to design hybrid materials with hydrophobic surface properties. The silica particles were prepared in basic conditions under atmosphere of carbon dioxide (CO₂), using tetraethylorthosilicate (TEOS) as a precursor and octyltriethoxysilane (OTES) as a surface modifying agent. It was demonstrated that the contact angles of silica hybrid films could be changed by varying temperature and pressure of CO₂. The investigation of the prepared hybrid materials by dynamic light scattering (DLS) and environmental scanning electron microscopy (ESEM), respectively, showed that they consisted mainly of particles with a diameter of 100–250 nm. Fourier transform infrared (FT-IR) spectra indicate that the interaction between the coupling reagents, at different conditions, is mainly through chemical bonding.     

纳米ZnO和TiO2粉体的表面改性及其应用研究

选用Span80对纳米级ZnO、TiO2和抗菌粉体进行表面处理,使Span80包覆于粉体表面,不但解决了粉体的严重团聚问题,而且将粉体的表面由极性变为非极性,在纺丝过程中能很好的与纤维表面相结合,测试结果表明,加入这种粉体生产的织物的抗菌和抗紫外线效率很高.     

Surface modification of calcite by wet-stirred ball milling and its properties

This paper investigates the surface modification of calcite from the Ni?de region of Turkey with sodium oleate (SDO) as a modification agent, which is incorporated into the calcite with wet ultra-fine grinding in a laboratory stirred ball mill. The effect of surface modification is evaluated by a floating test, which measures the active ratio (AR), fourier transform infrared spectrometry (FT/IR) and thermogravity analyses (TG-DTA). The results indicate that the hydrophilic surface of calcite becomes hydrophobic after the incorporation of SDO through wet-stirred ball milling.     

Surface modification of TiO2 nanoparticles and preparation of TiO2/PDMS hybrid membrane materials

TiO₂ nanoparticles were surface‐modified by a convenient and mild sol–gel method. A novel hybrid membrane material was prepared by crosslinking reaction based on poly(dimethylsiloxane) (PDMS) as organic matrix and TiO₂ nanoparticles as inorganic filler as well as a crosslinking agent. The chemical structure, mechanical and thermal properties, swelling performance and morphology of the hybrid membranes were characterized and investigated by FTIR, SEM, TG, and so on. The results showed that the surface modification method could make the compatibility between organic component and inorganic component good. The ultrathin PDMS hybrid membrane could easily be prepared by crosslinking reaction at room temperature and the conventional solution casting method. The preparation technology enhanced forming‐membrane ability of the hybrid membrane, shortened reaction time, and decreased some by‐products. In addition, the stress at break and the elongation at break of the hybrid membranes increased significantly with increasing TiO₂ contents. The enhanced mechanical properties of the hybrid membranes will develop potential application of PDMS membranes. POLYM. COMPOS., 38:1541–1548, 2017. © 2015 Society of Plastics Engineers     

Fabrication of superhydrophobic TiO2 quadrangular nanorod film with self-cleaning,anti-icing properties

Superhydrophobic TiO₂ quadrangular nanorod film was fabricated by hydrothermal reaction and stearic acid modification. X-ray diffractometer and Fourier transform infrared spectrometer were employed to characterize the surface crystal structures and chemical compositions of the superhydrophobic TiO₂ film, respectively. The effects of the titanium source (titanium tetraisopropoxide (TTIP)) amount and reaction time on the morphology and wettability of the TiO₂ film were studied by scanning electron microscope and contact angle meter. The results show that the diameter of the TiO₂ quadrangular nanorods increases and then the water contact angle on modified TiO₂ film decreases with the increase of the reaction time and TTIP amount. Moreover, when the TTIP amount is 0.3?mL and solvent is 30?mL, the wetted state of the superhydrophobic TiO₂ film surface conforms to an improved Cassie model. Besides, the superhydrophobic TiO₂ film shows good low adhesion, self-cleaning and anti-icing properties. Particularly, the anti-icing property decreases with the increase of the reaction time and TTIP amount.     

TiO2薄膜的制备、改性及光催化性能的研究

以铝片为基底,采用阳极氧化法制备氧化铝薄膜作为TiO₂的固定载体。用溶胶-凝胶法制备TiO₂溶胶,通过在氧化铝薄膜载体上浸渍提拉得到TiO₂膜。通过交流电沉积的方法对其掺杂贵金属改性,得到M/TiO₂复合膜。利用紫外-可见光谱法对复合膜进行表征。实验结果表明,利用Al₂O₃可以很好的负载TiO₂溶胶,500 ℃焙烧有利于形成催化能力较好的锐钛矿型TiO₂,掺杂贵金属Ag和Au的TiO₂试样对甲基橙的光催化效果明显优于未掺杂金属的TiO₂试样。     

Surface modification of TiO2 particles with 12-hydroxy stearic acid and the effect of particle size on the mechanical and thermal properties of thermoplastic polyurethane urea elastomers

The efficient surface modification of titanium dioxide (TiO₂) particles with different sizes was first carried out with “water only method” (Appl. Surf. Sci. 2018, 447, 664–672) developed in our group using 12-hydroxy stearic acid (12-HSA) as the modifier. The 12-HSA-modified TiO₂ particles with different sizes were then used to explore their effect on the mechanical and thermal properties of a thermoplastic polyurethane urea (TPUU) elastomer with superior mechanical and thermal properties produced newly in our lab using nonsymmetric alicyclic diisocyanate and diamine. Orthogonal experimental results showed that the order of impact of each factor on the modification efficiency of TiO₂ particles was: Temperature > time > modifier content. It was found that, in the nanometer (≤100 nm) range, smaller particles were more helpful to enhance the tensile strength of the TPUU elastomer, while larger ones to increase more significantly the elongation at break. Besides, the TiO₂/polyurethane urea nanocomposites exhibited much better thermomechanical performance than the pristine TPUU elastomer, and the thermomechanical performance of the nanocomposites increased with decreasing particle size.