硅烷改性液体聚丁二烯对天然橡胶复合材料性能的影响

Effect of silane modified liquid polybutadiene on properties of natural rubber composites

研究了硅烷改性液体聚丁二烯,即三乙氧基硅烷封端聚丁二烯(TTPB)对填充炭黑和白炭黑的天然橡胶(NR)复合材料性能的影响。结果表明,TTPB通过链两端的硅氧烷接枝到白炭黑的表面,改善了白炭黑在NR中的分散性;而且TTPB主链上包含有双键,该双键参与了NR的硫黄硫化,填料-橡胶间的相互作用以及白炭黑的增强作用均得以强化,导致橡胶的交联程度提高、填料网络减少。与未添加TTPB的NR相比,随着TTPB用量的增加,NR硫化胶的拉伸强度和撕裂强度均有所提高,压缩疲劳温升下降,60℃时的损耗因子降低,耐磨性能提高。其中,TTPB用量为5.0份(质量)时NR复合材料的撕裂强度最大,60℃时的损耗因子和DIN磨耗量均为最小。

The effect of silane-modified liquid polybutadiene,i.e.triethoxysilane-terminated polybutadiene(TTPB)on the properties of natural rubber(NR)composites filled with carbon black and silica was studied.The results showed that the TTPB was grafted to the surface of silica through the siloxane at both ends of the chain,which improved the dispersion of silica in NR.Moreover,this prepolymer as modifier contained double bonds that participated in sulfur curing of NR matrix,which led to the reinforcement of the filler-rubber interaction and the enhancement of silica,and then improved the degree of rubber crosslinking and reduced the filler network.Compared with NR without TTPB,the tensile strength and tear strength of NR compounds were increased with increase of TTPB amount,the compression fatigue temperature rise and the loss factor at 60℃decreased,and the wear resistance improved.When the TTPB amount was 5.0 phr(mass),the tear strength of the rubber was the largest,and the loss factor at 60℃and DIN abrasion of the rubber were the smallest.