Mechanical properties of recycled carbon fiber/sisal reinforced polypropylene composites
To improve the high-value application of recycled carbon fiber(RCF),carbon fiber(CF)preform(CFP)was prepared by wet nonwoven forming process.In order to avoid the influence of the binder in the wet preform on the composite forming during the heating process in the composite forming process,sisal fiber(SF)and RCF were mixed to improve the formabili-ty of CFP by hydrogen bonding between SF,then CF/SFP preforms were obtained.In addition,SF preforms(SFP)were prepared.Three kinds of PP-based composites(CFPC,SFPC,CF/SFPC)were prepared by compression molding with polypropylene(PP)as matrix and wet nonwoven fabric as preform.The structural properties of preforms formed by different fiber components and the mechanical properties of the polypropylene composites were tested.The effects of SF hybrid on the structural properties of wet preform and the mechanical properties of polypropylene composites were analyzed.The results show that the RCF can be mixed with SF to form a nonwoven preform with stable structure and mechanical properties under the condition of no binder.The hybrid process can improve the structural uniformity of the preform and the loss rate of CF in the wet forming process.When the SF with a mass ratio of 3∶1 is mixed with the RCF to prepare the wet preform,the fiber loss rate can be reduced by 33.63%,and the thickness unevenness is reduced by 35.03%.CFPC in the form of wet-laid nonwoven fabrics have good mechanical properties,especially in terms of toughness improvement.The tensile strain of CFPC can reach about 7%,the bending strength can reach 60.01 MPa,and the impact strength can reach 10.12 kJ/m2.The mechanical properties of CFPC can be effectively improved by mixing RCF with SF.The mechanical properties of CF/SFP prepared by mixing RCF and SF are much better than those of SFPC.Compared with SFPC,the flexural strength and impact strength of CF/SFPC increased by 13.09% and 18.42%,respectively.
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