采用液体天然橡胶(liquid natural rubber)为增容剂,基于湿法混炼工艺制备天然橡胶/白炭黑(W(NR/SiO2))复合材料.利用FT-IR、SEM、万能拉力机分别对复合材料的微观结构、拉伸断裂形貌及力学性能进行分析,通过Mooney-Rivilin方程和界面相互作用方程对橡胶-填料界面相互作用定量计算,并探讨了LNR的增客机理.结果表明,使用LNR增容后,NR与白炭黑两相界面变得模糊,断面表现为韧性断裂;硫化胶力学性能在LNR改性后得到改善,白炭黑用量为60 phr时表现最为明显,拉伸强度提高了25.73％;不同方程计算结果表明,白炭黑用量一定情况下,使用LNR增容后复合材料两相界面相互作用增强.LNR具有良好的增容效果,复合材料良好的相容性是LNR与NR和白炭黑两相同时发生作用形成增容界面的结果.
Natural rubber/silica composites(NR/SiO2) was prepared by wet mixing technology with liquid natural rubber (LNR) as compatibilizer.Micro-Structure,tensile fracture surface,mechanical properties and fillerrubber interaction were studied by scanning electron microscopy,FT-IR spectroscopy and universal tensile machine.The rubber-filler interaction was evaluated by Mooney-Rivilin equation and interfacial interaction equation quantitatively.The compatibilizing mechanism of LNR for W(NR/SiO2) composites was also investigated.The results showed that the SiO2 particles are tightly encompassed by NR in the presence of LNR and fracture sur faces appeared toughness fracture;good mechanical properties was observed,the tensile strength increase by 25.73％ when silica was 60 phr;the equations showed that filler-rubber interaction have great enhancements under certain amount of silica.It is reveal that LNR has better compatibility,which is attributed to LNR reaction with both NR and SiO2 to form compatibilizing interface.
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