纳米二氧化钛及其被覆聚丙烯酸酯分散液分析

聚合物分散液智能开关,全息材料等领域具有广阔的应用前景,激光全息技术飞速发展,使得激光全息聚合物分散液材料产生,其原理是利用光引发单体聚合,其性能主要取决于体系的相分离程度及折射率对比度。采用钛酸四丁酯为先驱物,冰醋酸为抑制剂,制备纳米二氧化钛溶胶,将单体滴加到纳米二氧化钛溶胶中,过硫酸钾单体在纳米二氧化钛溶胶粒子发生聚合反应,得到被覆聚丙烯酸酯分散液,使用动态光散仪分析纳米二氧化钛溶胶粒径,利用投射电镜观察被覆聚丙烯酸酯分散液形貌,探讨最佳溶胶单体混合液pH值,及纳米二氧化钛溶胶质量分数对被覆聚丙烯酸酯分散液成膜性能的影响,表明制备纳米二氧化钛溶胶平均粒径为263nm,包裹纳米二氧化钛溶胶粒子最佳反应温度为75℃,溶胶单体混合液pH值为8,溶胶质量分数最佳为20%。     

乙丙水溶胶的研究

采用丙烯酸及其酯与乙酸乙烯酯进行乳液聚合，所得乳液用有机胺微粒化制得的高质量乙丙水溶胶，既保持纯丙烯酸水溶胶的优点，又克服了其缺点，具有工业实用价值。介绍了乙丙水溶胶的制法，并列举了其性能指标。讨论了影响乙丙乳液及其水溶胶的诸种因素。     

国外炭黑文摘

用以非石墨化炭黑作参照系的密度泛函理论分析活性炭的孔隙尺寸分布；改善热缝填料的炭黑浆料；纳米炭黑敏化溶胶一凝胶氧化物的光电子、光催化性能对比；用分子层结构理论研究N2、Ar、丙酮、氯仿和丙酮-氯仿混合物在炭黑上的吸附性；乙烯一乙酸乙烯醋共聚物和乙烯-乙酸乙烯酯共聚物／炭黑混合物的γ辐射对比研究；     

ZnO@PPEGMA纳米粒子的制备与性能的研究

本文首先通过溶胶凝胶原位水解法成功合成ZnO@PPEGMA壳核复合结构纳米晶。ATRP引发剂2-溴异丁酰溴通过酰溴与ZnO表面羟基的酯化反应固定在ZnO纳米粒子表面,再由ATRP引发聚合甲基丙烯酸甲基醚聚（乙二醇）酯（PEGMA）得到粒子表面接枝聚（甲基丙烯酸甲基醚聚（乙二醇）酯）（PPEGMA）的改性ZnO纳米粒子（PPEGMA@ZnO）,表面引入PPEGMA后,ZnO纳米粒子的在溶剂中分散性得到提高,它的近带边发射峰发生蓝移。     

改性纳米氧化锌对丙烯酸聚氨酯涂层防腐性能的影响

为了改善纳米ZnO在涂料中的分散性,以钛酸酯偶联剂对其进行改性。研究了丙烯酸聚氨酯清漆、含未改性纳米氧化锌的丙烯酸聚氨酯涂层和添加钛酸酯偶联剂改性后的纳米氧化锌的丙烯酸聚氨酯涂层的防腐蚀性能。结果表明,经过钛酸酯偶联剂改性的纳米ZnO其团聚现象明显消失,与涂料表现出良好的相容性,所得的复合涂层的抗渗透能力明显比清漆和含未改性纳米ZnO复合涂层强。改性纳米ZnO显著提高了丙烯酸聚氨酯涂料的防腐性能。     

TiO2/ZnO水溶胶稳定性因素探讨

以钛酸丁酯和乙酸锌为前驱物,采用溶胶-凝胶技术制备TiO2/ZnO复合水溶胶。分析了TiO2与ZnO的掺杂比例,乙醇与钛酸丁酯比例,冰乙酸用量对溶胶稳定性的影响。结果表明:TiO2/ZnO复合水溶胶的稳定性随着ZnO所占比例的增大,冰乙酸量的增多都逐渐增强;TiO2/ZnO复合水溶胶的稳定性随乙醇和钛酸丁酯的比例的增大而不稳定。     

ZnO/石墨烯复合材料的制备及性能研究

本文将采用溶胶-凝胶法制备纳米ZnO和通过Hummers法制备的石墨烯进行简单的一步超声复合,得到ZnO/石墨烯复合材料。利用XRD、TEM以及紫外可见分光光度计对所制备的ZnO和石墨烯样品进行测试表征,并以亚甲基蓝的降解效率来评价ZnO/石墨烯复合材料的光催化活性能。研究表明:ZnO/石墨烯的光催活性较纯氧化锌提高了4倍有余,当石墨烯质量比为15%时,ZnO/石墨烯的光催化活性最强。     

紫外光固化腰果酚/ZnO复合膜的性能研究

将紫外光固化技术与溶胶-凝胶法相结合,制备了紫外光固化腰果酚/ZnO复合涂料;研究了ZnO在复合膜中的分散状态,以及ZnO含量对复合膜的热稳定性、抗紫外线性能、常规物理机械性能、抗溶剂性和耐化学介质性能的影响。结果表明,当ZnO含量不超过3%时,其以纳米尺寸均匀分布于复合膜中;随着ZnO纳米粒子含量的增加,复合膜的热稳定性、抗紫外线性能、抗溶剂性、硬度和抗冲击强度逐渐增大,光泽度、附着力、柔韧性和耐化学介质性能受ZnO含量的影响不大。     

溶胶-凝胶法制备聚丙烯酸酯/纳米TiO2有机-无机杂化材料的研究

以丙烯酸酯单体为原料,采用常规溶液聚合法制备了聚丙烯酸酯溶液,以钛酸正丁酯为前驱体,水解制备纳米二氧化钛溶胶,两者在常温高剪切力下共混,制得聚丙烯酸酯/纳米TiO2有机-无机杂化材料。分别用透射电子显微镜(TEM),原子力显微镜(AFM),双光束紫外-可见分光光度计UV-VIS,热重分析(TGA),拉伸测试研究了纳米溶胶以及杂化材料的性能。结果表明:TiO2在溶胶和杂化材料中都呈纳米级均匀分散,而且杂化材料的光学,热学,力学性能都比纯聚丙烯酸酯有显著的提高。     

高减震乙烯-乙酸乙烯酯橡胶发泡鞋用材料及其制备方法

<正>本发明公开了一种质轻高减震乙烯-乙酸乙烯酯橡胶发泡鞋用材料及其制备方法,由乙烯-乙酸乙烯酯橡胶、乙烯-乙酸乙烯酯树脂、乙烯-辛烯嵌段共聚物、相容剂、发泡剂、架桥剂、氧化锌、硬脂酸锌、助交联剂、填料组成。本发明工艺简单、易操作,产品更加轻量化,吸震性能优异,制备的产品冲击回弹率均低于     

Application of nano‐zinc oxide master batch in polybutadiene styrene rubber system

The properties of nano‐zinc oxide master batch filled butadiene styrene rubber (SBR) systems were researched in comparison with those of common zinc oxide and nano‐zinc oxide filled systems. First, the nano‐zinc oxide master batch was prepared and the cure characteristics of three different kinds of zinc oxide filled SBR composites were studied; second, the mechanical properties and wear resistance were compared; then, the improved mechanical properties were confirmed by dynamic mechanical properties and transmission electron microscopy. Finally, the zinc oxide amount reducing mechanism was analyzed. Results show that nano‐zinc oxide master batch filled SBR system has better mechanical properties than those of nano‐zinc oxide and common zinc oxide filled systems, which is due to the improved dispersion by master batch mixing technology. © 2006 Wiley Periodicals, Inc. J Appl Polym Sci 101: 922–930, 2006     

Multi-functional Polyester Hollow Fiber Nonwoven Fabric with Using Nano Clay/Nano TiO2/Polysiloxane Composites

Surface modification and property improvement of hollow polyester fiber nonwoven fabric is very important due to the application of substrate in the various fields. Here, nano clay, nano TiO₂ and polysiloxane softener as been applied on the hollow polyester fiber nonwoven fabric through conventional impregnation-dry-cure method in order to enhance the fabric properties. The alkaline hydrolysis of polyester was performed on the nonwoven surface to functionalize the fabric and increase the nanoparticles uptake. The nano clay was first dispersed by using nonionic dispersing agent, and then nano titanium dioxide dispersion was added dropwise to the prepared nano clay dispersion. Also, other dispersions were prepared with adding polysiloxane softener and polyurethane resin under sonication. The SEM images and EDX/XRD patterns indicated the presence of various applied particles on the surface of the fabric. Thermal gravimetric analysis was employed to investigate the thermal decomposition behavior of the treated samples. Self-cleaning properties of polyester nonwoven treated by TiO₂/nano clay/polysiloxane composite was followed by degradation of methylene blue under daylight irradiation at ambient temperature. It was found that nano clay/TiO₂/polysiloxane composite on the fabric surfaces improved self-cleaning property, thermal stability above 400 °C, and water absorption properties of the fabric.     

聚乙烯醇/氧化石墨烯纳米复合材料的制备与表征

氧化石墨烯是近几年国内外研究的热点之一。其原料易得、成本低廉、且具有良好的物理和化学性能,是一种优良的复合材料填充剂。本文首选改进的Hummers法制备氧化石墨烯,利用超声分散法制备了聚乙烯醇/氧化石墨烯纳米复合材料,使用红外光谱、扫描电镜等手段对其进行表征。结果显示,超声分散法使氧化石墨烯均匀的分散在聚乙烯醇基体中形成层离型复合材料。该方法可以用于多种水溶性聚合物。     

纳米SiO2颗粒对PU树脂热稳定性能的影响

采用溶胶-凝胶法制备纳米SiO2颗粒，并以此制备了SiO2／PU复合材料，用扫描电子显微镜、红外光谱仪、量热示差扫描仪和热重法分别表征了纳米复合树脂材料的结构和形态及热稳定性。结果表明，纳米SiO2能够均匀地以纳米尺寸分散于Pu树脂中，并与PU中的基团发生了化学反应，形成了键合。SiO2对PU树脂的耐低温性能影响不大，却提高了树脂的热稳定性能，使树脂的使用温度范围变宽。     

HIPS／TiO2／TAS纳米复合材料的制备及性能

通过对纳米TiO2表面预处理及选择特定的大分子分散H(TAS)和母料法制备工艺制备了HIPS／TiO2/TAS纳米复合材料,测试结果表明,制备的HIPS／TiO2/TAS纳米复合材料较原HIPS具有更好的综合力力学性能,且较原HIPS的硬度、耐热性能、阻燃性能亦同时得到提高。     

Effect of nano zinc oxide on the cure characteristics and mechanical properties of the silica‐filled natural rubber/butadiene rubber compounds

With the increasing interest in environmental and health issues, legal restrictions, such as European Union (EU) End of Life Vehicle Directives, were strengthened. This led us to incorporate nano zinc oxide (nano‐ZnO), with particle sizes of 30–40 nm and specific surface areas of 25.0–50.0 m²/g, instead of conventional ZnO into natural rubber (NR)/butadiene rubber (BR) compounds to decrease the content of zinc in the formulation. In the unfilled system, only a 20 wt % nano‐ZnO content, compared to conventional zinc oxide content, showed the cure characteristics and mechanical properties of the same level. This was because the increase in the specific surface area of the nano‐ZnO led to an increase in the degree of crosslinking. The effect of nano‐ZnO on the cure characteristics and mechanical properties was more pronounced in the silica‐filled system than in the unfilled system. This was mainly because of the dispersing agent used in the silica‐filled system, which also improved the dispersion of nano‐ZnO. The silica‐filled NR/BR compounds containing 0.3–3.0 phr of nano‐ZnO showed improved curing characteristics and mechanical properties, such as optimum cure time, 100 and 300% modulus, tensile strength, and tear strength compared to the compound with 5 phr of conventional ZnO. The optimum amounts of nano‐ZnO and stearic acid were only 1.0 and 0.1 phr, respectively. © 2010 Wiley Periodicals, Inc. J Appl Polym Sci, 2010     

原料及合成工艺对水性聚氨酯性能的影响

用不同聚醚以及不同的合成工艺制备了性能不同的水性聚氨酯乳液,研究了原料以及合成工艺对乳液和胶膜性能的影响。结果表明:用四氢呋喃-氧化丙烯共聚二醇制备的WPU性能比用聚氧化丙烯二醇制备的WPU的综合力学性能好,并且在分散的同时进行中和以及分散时将水加入到预聚体中进行乳化所得到的乳液比较稳定,而且两步法较一步法制的乳液分散性好,但胶膜力学性能方面,一步法好。     

纳米TiO2的分散及在水性涂料中的应用研究

研究了各因素对纳米TiO2水悬浮液稳定性的影响,通过正交试验筛选出了最佳的分散工艺,解决了纳米TiO2在水性介质中的团聚问题.将分散后的纳米TiO2浆料加入到普通的水性苯丙乳液涂料中,加入各种助剂配制出了性能优异的水性纳米TiO2涂料,并对涂料的性能进行了测试.     

注凝成型纳米防火玻璃

采用分散剂对纳米硅溶胶进行分散,和丙烯酰胺衍生聚合物结合,应用注凝成型（gelcasting）工艺制成具有高防火性能的纳米防火玻璃。其组成为硅溶胶、分散剂、丙烯酰胺、N-羟甲基丙烯酰胺。     

纳米氧化锌对橡胶性能的影响研究

研究了纳米氧化锌对胶料物理性能的影响。纳米氧化锌因其粒径小,表面积大,吸附活性大,从而具有表面效应和高活性;采用纳米氧化锌可提高胶料的耐磨性,H抽出力和撕裂性能,同时纳米氧化锌可以与橡胶分子实现分子水平上的结合,即纳米材料与橡胶分子的接枝作用,达到提高胶料性能的目的。