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首页> 外文期刊>Journal of Applied Polymer Science >Surface functionalization of rubber latex nanoparticles with sulfidosilane moieties
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Surface functionalization of rubber latex nanoparticles with sulfidosilane moieties

机译：带有硫代硅烷部分的橡胶胶乳纳米颗粒的表面官能化

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Polybutadiene latex particles were functionalized with bis[3-(triethoxysilyl) propyl] tetrasulfide (TESPT) in the presence of zinc oxide as an activator and ethanol as a co-solvent. The success of this reaction was confirmed both by the peaks attributed to Si-O groups at 1085 and 1110 cm(-1) and C-S bond at 630 cm(-1) which appeared after reaction in Attenuated Fourier Transform Infrared (ATR-FTIR) Spectra and also by increasing in the particle size diameter of latex particles (from 95 to 127 nm) in Dynamic Light Scattering analysis. X-ray Diffraction results also showed changes in crystalline structure of the modified particles (as a strong decrease in the intensity of peak at 2=19.54). The effect of reactant concentration in a constant amount of TESPT (by varying the water and ethanol content), reaction time, activator size (micro and nanoparticles), and pH (approximate to 7, 8.5) were investigated on degree of grafting (obtained from thermogravimetric analysis and ATR-FTIR spectra), particle size diameter, cross-link density, and swelling ratio of the samples. The amounts of silane grafting and cross-link density of polymer particles were increased by an increase in the reaction time. The highest grafting degree was observed at low concentration of TESPT. Silane functionalization was also improved in a slight basic condition (pH=8.5) rather than neutral pH. The grafting reaction took place such as sulfur pre-vulcanization and the possible mechanism of this reaction was discussed. (c) 2015 Wiley Periodicals, Inc.
机译：在氧化锌作为活化剂和乙醇作为助溶剂存在下，用双[3-（三乙氧基甲硅烷基）丙基]四硫化物（TESPT）对聚丁二烯胶乳颗粒进行官能化。该反应的成功通过在1085和1110 cm（-1）处的Si-O基团峰和在630 cm（-1）处的CS键在衰减傅里叶变换红外（ATR-FTIR）反应中出现而得到确认在动态光散射分析中，通过增加乳胶颗粒的粒径（从95到127 nm）来增加光谱和光谱。 X射线衍射结果还显示出改性颗粒的晶体结构发生了变化（在2 = 19.54处峰强度大大降低）。研究了在恒定量的TESPT中反应物浓度（通过改变水和乙醇含量），反应时间，活化剂尺寸（微米和纳米颗粒）和pH值（约7、8.5）对接枝度的影响。热重分析和ATR-FTIR光谱），粒径，交联密度和样品的溶胀率。硅烷接枝的量和聚合物颗粒的交联密度通过反应时间的增加而增加。在低浓度的TESPT下观察到最高的接枝度。在弱碱性条件下（pH = 8.5）而不是中性pH，硅烷的官能化也得到了改善。发生了接枝反应，如硫的预硫化，并讨论了该反应的可能机理。 （c）2015年威利期刊有限公司

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