纳米粒子在聚合物增强增韧中的应用

针对弹性体增韧塑料的状况，介绍了刚性粒子塑料的优点，对纳米粒子的特性，制备方法及表面处理方法作了详细的论述，并报道了纳米粒子与聚合物的物理化学作用，微裂纹化增韧机理，基体层厚度对增韧效果的影响，以及纳米粒子在聚合物增强增韧中的应用情况。     

基于乳液聚合法制备无机纳米粒子/聚合物复合粒子及其应用研究进展

综述了国内外通过乳液聚合制备聚合物包覆无机纳米复合粒子的方法及包覆效果,包括纳米SiO2/聚合物、CaCO3/聚合物、TiO2及其他无机粒子/聚合物,介绍了复合粒子的形成机理及其在电极材料、阻燃和感光树脂中的应用,并对其前景作了展望。     

纳米粒子增强增韧聚合物的研究进展

简述了纳米粒子的特性和增强增韧聚合物的机理,着重介绍了国内外纳米粒子增强增韧聚合物的性能和应用以及最近取得的成果。     

乳液法制备聚合物纳米粒子的研究进展

综述了乳液法制备聚合物纳米粒子的研究进展,详细介绍了采用新型乳化剂,即高分子表面活性剂与反应性表面活性剂,和以超声波辐照技术为主的新技术制备聚合物纳米粒子方面的研究成果。     

高分子聚合物包覆无机纳米粒子的研究进展

简单介绍了非液滴内成核法、液滴内成核法包覆无机纳米粒子的原理,重点讨论了乳液聚合法、无皂乳液聚合法、分散聚合法、悬浮聚合法、细乳液聚合法包覆无机纳米粒子的优缺点。针对包覆过程中产生的独立聚合物粒子、独立无机粒子,提出采用引发剂吸附在无机颗粒表面、采用反应性乳化剂和偶联剂处理无机粒子并控制单体用量;针对包覆多个无机粒子,提出采用聚合前超声空化技术。     

一步法制备新型荧光聚合物纳米粒子

采用一步细乳液聚合法将荧光单体4-甲胺基-9-(2-烯丙基)-1,8-萘二甲酰亚胺(MANI)共价键结合进聚合物纳米粒子中.光谱特性研究证明了MANI已经成功结合进人纳米粒子中.更重要的是,因为MANI通过共价键的方式结合进聚合物纳米粒子中,可以有效避免产生染料泄漏现象.并且可以通过控制纳米粒子中MANI的含量,来获得...     

纳米淀粉粒子的制备及其在橡胶中的分散性

采用反相微乳液聚合方法合成了具有稳定形态的纳米淀粉粒子,研究了纳米淀粉粒子在橡胶中的分散效果。结果表明,纳米淀粉粒子比普通淀粉粒子在橡胶中具有较好的分散效果。     

无机纳米粒子增强增韧聚合物的研究进展

介绍了无机纳米粒子的增韧机理与表面改性，并叙述了无机纳米粒子用于增韧增强聚合物的进展。     

聚合物纳米粒子的研究进展

随着聚合物科学和纳米技术的进步,聚合物纳米粒子已经有了巨大的发展.近年来,聚合物纳米粒子因其制备和设计简单、生物相容性好、结构多样性而被广泛应用于工程和生物材料中.聚合物纳米粒子具有更大的表面积,可存在大量的表面官能团(如配体).这种纳米粒子的毒性低,尺寸大小可控.综述了聚合物纳米粒子与其制备技术,用于制备它们的聚合物...     

高分子／碳酸钙纳米粒子、其功能型粒子及其制备方法

本发明涉及高分子／碳酸钙纳米粒子、其功能型粒子及其制备方法。本发明以纳米碳酸钙粒子、烯基单体、偶联剂及含有非烯基官能团的烯基单体为原料，通过以水为介质的微乳液聚合制备高分子／碳酸钙纳米复合粒子和功能型高分子／碳酸钙纳米复合粒子。前者具有以纳米碳酸钙为核、聚合物为壳、核壳间具有化学键接的球形粒子特征，粒径均一，且小于100nm;后者外表面还带有非烯基官能团。     

纳米粒子对硅橡胶的增强改性研究进展

纳米粒子和纳米复合技术对于开发新型功能复合材料具有十分重要的意义,其中纳米粒子对橡胶的复合改性为硅橡胶性能的提高提供了新的途径.评述了二氧化硅、黏土、氧化铝、碳酸钙、二氧化钛等纳米粒子对硅橡胶的物理机械性能、耐热性能、阻燃性能及耐老化性能等方面的增强改性,简述了溶胶-凝胶法、层间插入法及共混法三种纳米硅橡胶复合材料的制备方法,并指出了纳米硅橡胶复合材料的研究发展方向.     

Tailoring the polymeric nanoparticles for rubber reinforcement

Polymeric nanoparticles with brush‐like polydiene as the shell and crosslinked polystyrene as the core are synthesized using anionic polymerization via a self‐assembly process of macromolecules in solutions. The microstructures of nanoparticles were designed to match those of the matrix polymer used for tire compounds. Desirable compound properties were obtained by tailoring the shell sizes of the nanoparticles. Depending on the core/shell structures of the nanopartilces, the addition of the nanosized particles may impart the compound ultimate physical properties. Well reinforced compounds with enhanced dynamical storage modulus (G′) without increasing their dependences on temperature and deformation strain can be obtained by the addition of the nanoparticle with lengthened shell chains. Improved tensile mechanical properties without increasing high‐temperature hysteresis were also attained by such reinforcement. Passenger and truck tire applications can be advantageously benefited from these properties with improved tire handling and cornering consistence without increasing the rolling resistance and the sacrifices of other performances. A miscibility study was conducted on various binary blends of nanoparticle and rubber matrix. The compatibility between the nanoparticle and the matrix rubber along with the core concentration were demonstrated to be responsible for the observed improved compound properties. © 2010 Wiley Periodicals, Inc. J Appl Polym Sci, 2011     

The reinforcement of red clay on natural rubber and its reinforcing mechanism

Three kinds of red clay were fractionated according to the particle size using ultrasonic and centrifugal method. The mechanical properties of the clay‐rubber composite with various clay fractions were determined. At the same time, both the content of the metal components in the clay and the affect to the aging properties were determined. The result shows that within a certain range, the clay particle size only affects some of the mechanical properties of clay‐rubber composite. The characteristic morphological structure of the clay provides a significant reinforcing action on clay‐rubber composite. We speculate that mechanism of the reinforcement of clay on rubber is that the clay forms a rigid or semi‐rigid chain aggregation structure in rubber. © 2009 Wiley Periodicals, Inc. J Appl Polym Sci, 2009     

橡胶增强的理论研究

修正的Einstein方程用于描述低填充橡胶的弹性模量,改进的Halpin—Tsai方程可较好预测较高填料体积分数下体系的弹性模量。描述了填料增强橡胶体系应力—应变曲线的4个重要模型：范德华网络模型、双网络模型、JGmC2L方程以及炭黑增强橡胶的链组理论。范德华网络模型以填料聚集体作为增强单元,且认为其可发生塑性变形和破坏;双网络模型强调了填料网络中橡胶分子链的完全伸展和取向对增强的贡献;JGmC2L方程体现了高伸长率时材料结构变化导致有限伸长特性的变化;链组理论以链组而不是单根链作为独立的形变单元。4种模型均有一定的合理性和局限性,有待建立可全面反应材料在整个大形变过程中黏弹性力学行为的新方程。     

橡胶的织物增强

从织物的增强性能角度出发,论述了对橡胶复合结构的增强条件。说明不同的织物材料、结构形式和工艺过程对最终的合成橡胶制品性能有影响,从而通过对织物的改性和正确选择,达到提高橡胶制品强度的目的。     

纳米硒的制备和表征

硒是一种人体必需的微量元素，随着科技的发展，人们对这种物质的利用也越来越广泛。报道了一种以聚乙烯醇作为软模板制备纳米硒的方法，并对所制得的纳米硒进行了表征，研究了反应物的浓度、温度，以及超声等反应条件对产物形貌及粒径的影响。结果表明，当反应体系中亚硒酸浓度为0．01mol／L、抗坏血酸浓度为0．07mol／L、聚乙烯醇质量分数为1．0％、常温下反应5min后可得到均匀稳定的球形红色纳米硒颗粒，平均粒径约30nm。     

Preparation of epoxidized acrylonitrile butadiene rubber and its compatibilization effect on water-swellable rubber composites

In this research, water-swellable rubbers (WSRs) were prepared by the blending of acrylonitrile butadiene rubber (NBR) with epoxidized acrylonitrile butadiene rubber (ENBR), precipitated silica, vulcanizing agents, and polyacrylic acid sodium (PAAS) as superabsorbent polymers (SAPs). ENBR was prepared with a molybdenum trioxide catalyst and a tert-butyl hydroperoxide oxidant through a free-radical reaction under specific conditions and was used as a compatibilizer to improve the interfacial adhesion of the NBR matrix and hydrophilic components of the WSRs. Fourier transform infrared spectroscopy and X-ray photoelectron spectroscopy were used to analyze the structure and properties of ENBR. The dispersion of silica and SAPs in the rubber matrix was investigated by transmission electron microscopy. The presence of ENBR enhanced the water-absorption properties of the WSRs. The NBR–ENBR composites exhibited a higher mechanical performance after water absorption than that without ENBR. Both the swelling ratio and the absorption rate increased with the ENBR content. When the weight ratio of NBR–ENBR was 25/75, an equilibrium swelling ratio of 172% (13% higher than that of the sample without ENBR) was obtained. Scanning electron microscopy analysis revealed that the addition of ENBR improved the compatibility between the SAPs and the NBR matrix. © 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019 , 136, 47694.     

胶料预处理对补强硅橡胶性能的影响

本文研究了胶料预处理的不同方式对硅橡胶补强的影响。结果表明：无论含羟基硅油与否,170℃预处理硅橡胶的拉伸强度最高,放置处理试样的拉伸强度介于未处理和170℃预处理之间;胶料预处理与否对不含羟基硅油的硅橡胶硬度没有影响。含羟基硅油的硅橡胶中,170℃预处理的试样硬度最低,未处理的试样硬度最高。含羟基硅油的硅橡胶断裂伸长率变化不大。不含羟基硅油的硅橡胶断裂伸长率为170℃预处理的试样最低。     

固体纳米脂质微粒的制备及性能表征

采用EIP(相转变体积)转相法,以单甘酯为脂质原料,复配硬脂醇醚-25,制备了固体纳米脂质微粒(SLN)及其悬浮液,通过对乳化温度及固体纳米脂质微粒组成的研究,优化了制备条件,表征了固体纳米脂质微粒的形貌特征、粒径及Zeta电位分布,同时又研究了其离心、储存及稀释稳定性.结果表明,在乳化温度为60℃,脂质原料与乳化剂的质量比为1:1条件下制得的固体纳米脂质微粒平均粒径为169nm,粒子呈圆形,分布均一,Zeta电位为-6.18 mV,且具备良好的离心、储存及稀释稳定性.