Investigation of compound fiber surface treatment on the performance of poly(butylene succinate)/chemithermomechnical pulp fiber composites

摘要

A compound surface treatment(alkali treatment and cellulose fatty acid ester(HECLAE)treatment)was used to pretreat chemithermomechnical pulp(CTMP)fiber in order to alter the surface characteristics of fibers.The mechanical performance,rheological properties and morphology characteristics of poly(butylene succinate)(PBS)/CTMP fiber composites prepared by compound or individual treated fibers were investigated and compared.Experimental data show that the maximum tensile and flexural strengths of composites prepared only by HECLAE treatment appeared when HECLAE loading was 2wt％.In comparison with that of the composite prepared by untreated fibers,the tensile and flexural strengths of the composite containing 30wt％of CTMP fiber treated with 2wt％HECLAE increased by 18.4％and 15.3％,respectively.The integrated mechanical properties of composite prepared by alkali treated fibers are superior to those of composite prepared by HECLAE treated fibers.The combination of these two modification methods favors the enhancement of tensile strength of composite.In comparison with the composite prepared only by alkali treatment,the tensile strength of the composite prepared by 2wt％HECLAE and alkali compound surface treatment increased by 16.7％,indicating the combination of these two modification methods can significantly improve the mechanics performance of PBS.Furthermore,The rheological characterization results show that when fibers were alkali treated,the shear viscosity of composite exhibited a larger increase.Whereas the shear viscosity of composite prepared by HECLAE treated fibers exhibits a slight decrease.Scanning electron microcopy(SEM)images indicate that the fiber surface was changed to rough after alkali treatment.Simultaneously,the comparison of mechanical performance and SEM images of varied specimens illustrated that the modification effect of HECLAE treatment can improve fiber order in matrix and enhance the interfacial bonding.Whereas,the modification effect of alkali treatment is mainly due to the enhancement of interfacial bonding.