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首页> 外文期刊>Journal of Applied Polymer Science >Silica-reinforced natural rubber prepared by the sol-gel process of ethoxysilanes in rubber latex
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Silica-reinforced natural rubber prepared by the sol-gel process of ethoxysilanes in rubber latex

机译：胶乳中乙氧基硅烷的溶胶-凝胶法制备的二氧化硅增强天然橡胶

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摘要

Silica-reinforced natural rubber (NR) composite was prepared by using tetraethoxysilane (TEOS) as a precursor to generate silica particles inside the rubber. The silica was generated in situ by the sol-gel process of TEOS that was mixed directly into commercial-graded NR latex having 60% dry rubber content and 0.7% ammonia. The conversions of TEOS to silica inside the rubber were ranging from 90 to 97%. The silica particles dispersed evenly without extensive aggregation with sizes between 100 and 500 nm, as determined by scanning electron microscopy (SEM). An experimental design methodology, namely "two-level factorial design," was used to evaluate the influence of the amounts of TEOS, ammonia, and gelation time on the tensile modulus, tensile strength, and tear strength of the vulcanizates. The mechanical properties were significantly affected by the amount of TEOS added into the latex. Ammonia in the amount of 0.7% (w/w) present in the commercial latex was found to be sufficient for the conversion reaction of TEOS to silica. Bis-(3-triethoxysilylpropyl)tetrasulfide or TESPT, a coupling agent regularly used in rubber industry, was also added with TEOS to prepare the silica-filled composite. The presence of TESPT resulted in an increase of the mechanical properties and the rate of sulfur cure. (c) 2008 Wiley Periodicals, Inc.
机译：通过使用四乙氧基硅烷（TEOS）作为前体制备二氧化硅增强的天然橡胶（NR）复合材料，以在橡胶内部产生二氧化硅颗粒。通过TEOS的溶胶-凝胶法原位生成二氧化硅，将其直接混合到具有60％干橡胶含量和0.7％氨水的商业级NR胶乳中。橡胶内部TEOS到二氧化硅的转化率为90％至97％。通过扫描电子显微镜（SEM）确定，二氧化硅颗粒均匀分散而没有广泛聚集，尺寸在100至500nm之间。实验设计方法，即“二级析因设计”，用于评估TEOS，氨水和胶凝时间对硫化橡胶的拉伸模量，拉伸强度和撕裂强度的影响。力学性能受到乳胶中TEOS含量的显着影响。发现商业胶乳中存在的0.7％（w / w）的氨足以使TEOS转化为二氧化硅。还将双-（3-三乙氧基甲硅烷基丙基）四硫化物或TESPT（通常在橡胶工业中使用的偶联剂）与TEOS添加在一起，以制备二氧化硅填充的复合材料。 TESPT的存在导致机械性能和硫固化速率的增加。 （c）2008 Wiley期刊公司

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