In order to realize the resource high value utilization of tea residue,tea stalk fiber(TSF)was used as raw material to modify its surface with chain extender 4,4'-diphenylmethane diisocyanate(4,4'-MDI).The 4,4'-MDI modified tea stalk fiber(MDI-TSF)was blended with polyterephthalate-butanediol adipate(PBAT)to prepare the composite.The isocyanate bond(—N=C=O)at both ends of 4,4'-MDI reacted with the hydroxyl group(—OH)on the surface of TSF,reducing the hydroxyl group content on the surface of TSF and weakening its surface polarity,thereby reducing the polarity difference between TSF and PBAT.The addition of ESO improved the interface compatibility between TSF and PBAT,thereby improving the mechanical properties of the composites.The addition of modified tea stalk fiber MDI-TSF could effectively enhance the tensile strength,bending strength and thermal stability of the composites.When the mass ratio of PBAT to MDI-TSF was 80∶20,the composite material PBAT/ESO/20％MDI-TSF prepared by adding 20％MDI-TSF and 10％ESO had the best comprehensive mechanical properties,and the tensile strength,bending strength and impact strength were 13.014 MPa,10.94 MPa and 18.314 kJ/m2,respectively.Compared with the composite of PBAT/ESO/20％TSF(8.652 MPa,8.32 MPa,14.563 kJ/m2),the tensile strength,bending strength and impact strength were increased by 50.4％,31.5％and 25.8％,respectively,and the thermal stability and crystallinity were also improved.
关键词
聚对苯二甲酸-己二酸丁二醇酯/界面相容/复合材料
Key words
polyterephthalate-butanediol adipate/interfacial compatibility/composite material
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