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首页> 外文期刊>Journal of Macromolecular Science. Pure and Applied Chemistry >Silica-ethylene propylene diene monomer rubber networking by in situ sol-gel method
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Silica-ethylene propylene diene monomer rubber networking by in situ sol-gel method

机译：原位溶胶-凝胶法制备的硅-乙丙二烯单体橡胶网

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摘要

Triethoxysilyl-grafted ethylene propylene diene monomer rubber (EPDM) was prepared with the silane coupling agent, bis-[-3-(triethoxysilyl)-propyl]-tetrasulfide (TESPT), and thus modified rubber has been treated by an in situ sol-gel method with the objective to grow silica particles inside the rubber matrix. TESPT grafted EPDM rubber, filled with the silica particles grown by making use of the described method, was found to exhibit excellent physical properties, despite the fact that the fraction of silica fillers in this material is found to be very low. In particular, thus produced filled rubber has higher reinforcing efficiency that is attributed to the formation of a rubber-silica network. In addition, better silica dispersion is observed in the shear modulus measurements at low dynamic deformation amplitudes, which is in qualitative agreement with the 'Payne' effect that quantifies the ability of fillers to promote the formation of rubber-filler networks. No such effect of network formation was observed when an in situ sol-gel experiment was performed in the absence of TESPT. TEM observations showed that even if the amount of silica fillers in rubber is as small as 5 phr or less, the uniform mono-dispersed distribution of the silica primary particles is still the main factor responsible for the reinforcement of the rubber matrix.
机译：用硅烷偶联剂双-[-3-（三乙氧基甲硅烷基）-丙基]-四硫化物（TESPT）制备了三乙氧基甲硅烷基接枝的乙烯丙烯二烯单体橡胶（EPDM），并通过原位溶胶处理了改性橡胶。凝胶法，目的是在橡胶基质内部生长二氧化硅颗粒。发现填充有通过使用所述方法生长的二氧化硅颗粒的TESPT接枝的EPDM橡胶表现出优异的物理性能，尽管发现该材料中二氧化硅填料的比例非常低。特别地，由此产生的填充橡胶具有更高的增强效率，这归因于橡胶-二氧化硅网络的形成。另外，在低动态变形幅度下，在剪切模量测量中观察到了更好的二氧化硅分散性，这与“佩恩”效应定性一致，“佩恩”效应量化了填料促进橡胶-填料网络形成的能力。当在没有TESPT的情况下进行原位溶胶-凝胶实验时，没有观察到网络形成的这种影响。 TEM观察表明，即使橡胶中二氧化硅填料的量少至5phr或更小，二氧化硅一次颗粒的均匀单分散分布仍然是增强橡胶基质的主要因素。

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