高阻隔生物基PEF填充丁基橡胶复合材料的结构与性能

Structure and properties of butyl rubber composites filled with high-barrier biobased PEF

丁基橡胶(IIR)由于自身的高阻隔性,成为轮胎内胎、气密层和医用瓶塞的主要原料。为进一步提升IIR的力学性能,与传统补强填料无机刚性粒子相比,要求聚合物填料与IIR的相互作用更强,因此,采用聚合物补强IIR有望进一步提高材料力学性能。生物基聚2,5-呋喃二甲酸乙二酯(PEF)具有优异的阻隔性能、较高的拉伸强度、拉伸弹性模量和良好的热性能,在高阻隔材料领域有着巨大的应用潜力。采用酯化-缩聚法制备的高阻隔生物基PEF填充IIR,研究了PEF含量对PEF/IIR复合材料硫化性能、力学性能、气体阻隔性及微观结构的影响。结果表明,PEF能够促进混炼胶的硫化,缩短正硫化时间;增加PEF含量,复合材料的力学性能呈现先上升后下降的趋势,当添加PEF含量为5份时,5PEF/IIR的分散相分布均匀,拉伸强度、断裂伸长率和撕裂强度最高,较IIR分别提高了168%,49%和39%;复合材料的气体阻隔性进一步提高,5PEF/IIR的透气系数较IIR下降了68%。

Butyl rubber(IIR)has become the main raw material of tire inner tube,airtight layer and medical bottle stopper due to its high barrier property.In order to further improve the mechanical properties of IIR,compared with the traditional reinforcing filler inorganic rigid particles,a stronger interaction between polymer fillers and IIR is required.Therefore,the use of polymer reinforced IIR is expected to further improve the mechanical properties of the materials.Bio-based polyethylene 2,5-furandicarboxylate(PEF)has outstanding barrier properties,high tensile strength,tensile modules of elasticity and good thermal properties,and has great application potential in the field of high-barrier materials.The high barrier biobased PEF prepared by esterification-condensation method was filled with IIR.The effects of PEF content on the vulcanization properties,mechanical properties,gas barrier properties and microstructure of PEF/IIR composites were investigated.The results indicate that PEF can promote the vulcanization of rubber compounds and shorten the optimum vulcanization time.With the increase of PEF content,the mechanical properties of the composites show a trend of first increasing and then decreasing.The dispersed phase distribution of 5PEF/IIR is uniform,and the tensile strength,elongation at break,and tear strength reach their highest values,which are 168%,49%,and 39%higher than IIR,respectively.The gas barrier properties of composites are further improved,and the gas permeability coefficient of 5PEF/IIR decreases by 68%compared with that of IIR.