Structure and properties of butyl rubber composites filled with high-barrier biobased PEF
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 rein-forced 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 vulca-nization of rubber compounds and shorten the optimum vulcanization time.With the increase of PEF content,the mechanical proper-ties 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.
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