异咯嗪蒙脱石修饰电极的电化学行为

应用十六烷基三甲基溴化铵对蒙脱石进行改性，成功地制备稳定性良好的异咯嗪蒙脱石修饰电采，用循环伏安法对此修饰电极的电化学行为进行了研究。测定了异咯嗪在蒙脱石膜内的化学扩散系数，对异咯嗪在改性蒙脱石中电极反应机制进行了探讨。     

三正辛胺修饰电极伏安测定痕量金的研究

用化学修饰电极伏安测定痕量金,Kalcher K等曾采用阴离子交换剂碳糊修饰电极及打萨宗碳糊修饰电极检测100～300μg/L的金。本文采用三正辛胺(TOA)修饰玻碳电极,在1.5 mol/L介质中,Au(Ⅲ)在+0.16 V(vs SCE)处有一灵敏的不可逆还原峰。检出限为0.1μg/L。灵敏度比文献方法高千倍。Au(Ⅲ)浓度在5×10~(-7)～5×10~(-9)mol/L范围内峰高与浓度     

纳米银自组装电极的制备及对高氯酸二茂铁的电化学响应

采用自组装的方法制备了纳米银粒子修饰金电极,并运用循环伏安法、交流阻抗谱探讨了该电极的电化学特性.研究了高氯酸二茂铁在该修饰电极上的直接电化学行为.实验结果表明,高氯酸二茂铁在该修饰电极上具有良好的电流响应.用示差脉冲法测定高氯酸二茂铁,其氧化峰电流与浓度在4.0×10-6～5.0×10-4 mol/L范围呈良好线性关系,线性方程为:Ip(μA)=0.0236c(μmol/L)-0.0975,线性相关系数为0.9982,检出限为2.3×10-7 mol/L(信噪比为3).     

Polymer-Titanium hybrids obtained by radical polymerization and Sol-Gel process

The possibility to prepare hybrids made by poly(vinyl acetate) (PVAc), poly(methyl methacrylate) (PMMA) and/or poly(ethyl acrylate) (PEtA) with TiO₂ was studied. The processes of polymer formation-radical polymerization and sol-gel process for inorganic network —were achieved simultaneously. Due to a high reactivity of titanium isopropoxide (TIP) in the sol-gel process, a complexant comonomer, allyl acetoacetate (AlAcAc), was used. Covalent bonds between polymer and inorganic chains were obtained by addition of trialkoxysilane derivates with vinyl (VTES) or methacryloyl (MPTS) groups. The presence of TIP inhibits the radical polymerization of vinyl acetate (VAc). The PVAc-TiO₂ hybrids were produced by the sol-gel process of TIP in the presence of pre-obtained PVAc. Except for VTES and MPTS, trialkoxysilane derivates with methyl (MeTES), octyl (OTES) and phenyl (PTES) groups were used. The thermal stability of hybrids is strongly affected by TiO₂ presence and by the type of trialkoxysilane derivates. The thermal stability of PVAc hybrids decreases in the presence of TiO₂ inorganic network. The glass transition temperature of polymers increases in the presence of the inorganic network.     

核-壳型聚丙烯酸酯复合乳液

简述了核-壳型聚丙烯酸酯复合乳液的合成方法、形态及其影响因素与判断方法、结构与性能等方面的研究进展;认为核-壳型复合乳液膜机械性能优良的原因是:核、壳两相间存在的过渡区适当地抑制了二者的相分离。     

水性丙烯酸酯共聚物交联体系的流变性

用旋转粘度计研究了甲基丙烯酸甲酯／丙烯酸丁酯／丙烯酸三元共聚物水性交联体系的流变性，考察了树脂含量、金属鳌合物含量和氨水水化对其流变性的影响。结果表明：三元共聚物水性交联体系呈非牛顿流体流变行为，具有剪切变稀特性；随树脂含量或鳌合物含量增加，体系的增稠能力得以增强；水化不仅可改善体系的增稠性能，而且可增强体系的非牛顿流变性。     

Core/shell particles containing 3-(methacryloxypropyl)-trimethoxysilane in the shell: synthesis, characterization, and application

In comparison to the corresponding single-component counterparts, core/shell particles are widely used due to their better physical and chemical properties. The surface properties of core/shell particles evidently play an important role in the process of application. It is easy to deduce that surface properties mostly depend on the properties of the component in the shell. Therefore, desirable materials of shell are very significant for the study of composite materials, especially in core/shell field. It is well known that polysiloxane has excellent properties, such as the water repellency, high flexibility, low surface energy, and biocompatibility. Its application, however, is limited due to poor cohesiveness and poor film-forming properties. Recently, much endeavor has been made to overcome such flaws. It is found that polyacrylate is commonly considered for its good cohesiveness and excellent film-forming property. The combination of polysiloxane and polyacrylate has been shown to be important in the composite material field, especially as core/shell particles. Unfortunately, their hydrophobicity is considerably different and thus, the core/shell particles consisting of polyacrylate (PA)/polysiloxane (PSi) are hard to prepare by general seeded emulsion polymerization, and are also scarcely available in the literature. In this study, the new core/shell PA/PSi particles with poly(butyl methacrylate) (PA) as the core and poly(3-(methacryloxypropyl)-trimethoxysilane) (PSi) as the shell were prepared by dispersion polymerization under the kinetically controlled conditions. The characterization of the particles by TEM, DSC, particle size analyzer as well as static contact angle confirmed the formation of core/shell structure. The application of core/shell (PA/PSi) particles also has been considered and discussed here.TEM micrographs of core/shell (PA/PSi) particles.     

N—（3—二茂铁乙酰胺基）丙基吡咯聚合物修饰的葡萄糖电极的研究

于铂电极上修饰一层Ｎ－（３－二茂铁乙酰胺基）丙基吡咯聚合物膜，应用循环伏安法对聚合物的电化学性能进行研究，发现了Ｎ－位取代吡咯聚合物的电活性大大降低，聚合物中 二茂铁基团氧化还原性能稳定，制成酶电极后，在＋０．２Ｖ以葡萄糖有一明显的催化峰，而对抗坏血酸，尿酸则几乎没有呼应，该葡萄糖电极性能稳定，连续工作十天，响应值基本不变。     

MAA存在下VAc/BA核壳乳液聚合过程中的胶粒形态研究

用ＴＥＭ和电位滴定法对不同配方和工艺条件得到的胶粒形态结构和羧基分别进行了表征。结果表明：加入甲基丙烯酸有利于胶粒的稳定和形成规则的核壳胶粒。半连续加料不会形成完全反转的核壳结构,但是,核层在反应过程中由于聚合物簇的迁移会造成形变。由于胶粒中聚合物浓度高,粘度大,因而胶粒形态变化受动力学影响甚大,羧基分布主要是由动力学确定的。     

盐酸含量对光固化聚氨酯丙烯酸酯/SiO2杂化材料结构和性能的影响

由正硅酸乙酯水解制得的SiO2溶胶，在以γ—甲基丙烯酰氧丙基三甲氧基硅烷(TMSPM)为偶联剂的体系中，经溶胶-凝胶法制备了透明的光固化聚氨酯丙烯酸酯杂化材料[(PUA—TMSPM)／SiO2]。研究了盐酸浓度对(PUA-TMSPM)／SiO2结构与性能的影响。结果表明：随着pH值减小，硅溶胶体系和(PUA-TM-SPM)／SiO2杂化体系的热稳定性增大；盐酸摩尔分数XHCl的增加使(PUA-TMSPM)／SiO2光固化膜表面的两相界面结合更紧密，涂层变得更致密，并导致膜的硬度和耐磨性提高。