Study on effect of alkali treatment on properties of waste polyester fabric/hemp stalk composite material
In order to solve the problem of poor interfacial compatibility between hemp stalk powders and hydrophobic polymer matrix,the hemp stalks were alkalized with 8%(mass fraction)NaOH solution as modifier,and then the waste polyester fabric/hemp stalk composite material was prepared.The properties of composite materials were studied through mechanical property testing,combining with scanning electron microscopy(SEM),X-ray diffraction(XRD)and differential scanning calorimetry(DSC)technical means.The results showed that after alkali treatment of hemp stalks,the surface of hemp stalk powders was etched,the roughness increased,the non-cellulose component dissolved,and the binding force between powders and matrix increased.The bending strength of comparing with the waste polyester fabric/hemp stalk composites prepared without alkali treatment,the bending strength of the composite prepared with alkali treatment increased by 25.0%,and the internal bonding strength increased by 29.7%.The glass transition temperature and crystallization temperature increased from 71.2℃and 216.5℃to 79.1℃and 220.7℃,respectively.And the interfacial compatibility was improved.Crystallinity decreased.
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