The Research Of Nanoparticles Modified Jute Fibers And Its Polypropylene Matrix Composites

Jute fibers reinforced polypropylene?PP?composites possessed obvious advantages,such as low price,light mass,high strength,and environment friendly and so on.It was widely used in human production and life.However,the composite material after processing was unable to give full play to the fibers reinforcement effect because of the poor comprehensive performance.In this paper,the surface modification of jute fibers after roughening was carried out by means of in-situ method.The effects of jute fibers surface roughening and nanoparticles on the properties of jute fibers were studied,and the influence of nanoparticles modification on the interfacial properties of jute fiber s composites was analyzed,and nanoparticles modified jute fibers/PP composites were prepared.The mechanical properties and interface of the composites were studied,and the composite model and the interface mechanism of this kind of composites were established.Jute fibers treated by alkali treatment,ethylenediamine/alkali treatment and acid/alkali treatment.It was found that three different treatments could remove the pectin and impurities on the surface of jute fibers and increase the crystallinity,surface roughness,surface free energy.Compared with different treatments,acid/alkali treatment could remove the pectin and impurities of jute fibers and increase its surface roughness,and improve its hydrophilicity and surface energy at utmost.Using TEOS as a silicon source,nano-SiO₂ particles were formed on the surface of acid/alkali treated jute fiber treated by in situ method.The deposition mechanism and interfacial bonding mechanism of nano-SiO₂ on the surface of jute fibers were investigated by single factor method.Finally,the optimum deposition process was determined by orthogonal test.When jute fibers was 0.1g,the concentration of ammonia was 0.6mol/L,TEOS was 0.5mL,the reaction time was 6h and the reaction temperature was 40^oC,the deposition amount of nano-SiO₂ was 2.4%,and the particle size was 80nm,the comprehensive properties of the single fiber were the best.The mechanical properties and micromorphology of composites formed by jute fibers and PP were analyzed,which jute fibers were treated by different methods including untreatment,acid/alkali treatment and nano-SiO₂ modified treatment.The results showed that the mechanical properties of jute fiber/PP improved significantly after the surface of nano-SiO₂ modification.Compared with the untreated jute fibers/PP composites,the tensile strength,bending strength and impact strength of the nanoparticles modified jute fibers under the best process/PP composites increased by 47.50%,39.33%and 41.45%,respectively.Through the microscopic fracture morphology,it was found that the nnanoparticles modified jute fibers was most closely associated with the PP,and the fibers was almost unextracted.It was indicated that nano-SiO₂ significantly improved the interfacial bonding properties between jute fibers and PP.Based on the analysis of such interface properties,the interface composite model of this kind of composite was established.