Preparation and properties of titanate-modified ceratocarpus arenarius/epoxy composites
With the world's attention to environmental protection,renewable and degradable natural plant fibre composites have gradually become the focus of research.In order to explore the large-scale utilization of natural plant fibre,ceratocarpus arenar-ius from Xinjiang region as the research object was selected,and ceratocarpus arenarius/epoxy resin(50/50)composite was prepared with the help of moulding process through the surface modification of titanate coupling agent(NDZ-201).The effects of ceratocarpus arenarius fibre surface modification on the mechanical properties,structural morphology and thermal stability of the composites were investigated by means of fourier transform infrared spectroscopy(FTIR),universal mechanical tester,shore hard-ness tester,scanning electron microscope(SEM),and dynamic mechanical analyser(DMA),etc.FTIR analysis show that Ti—O absorption peaks appear in the treated ceratocarpus arenarius fibre and the hydroxyl content on the fibre surface is reduced.Mechani-cal testing of the composites confirm the mechanical strength enhancement with increasing NDZ-201 mass fraction of modified cera-tocarpus arenarius fibre,and the flexural strength(73.3 MPa)and hardness(93.8 HD)of the composites reaches the maximum values at 1% mass fraction of NDZ-201,which are 21.8% and 6.0% higher than those of the unmodified composites.The SEM results confirm that the ceratocarpus arenarius fibre treated with the coupling agent are more neatly and orderly arranges,and there are no holes in the material.The DMA results show that the energy storage modulus of the modified composites is further improved and the glass transition temperature of the composites is increased from 94℃ to 98℃.This indicates that after modification with coupling agents,the interaction force between the ceratocarpus arenarius and epoxy resin is further strengthened,and the movement of epoxy resin molecular segments is inhibited.
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