Preparation and properties of modified nano-SiO2/bio-based polyamide 56 composites
In order to improve the interfacial adhesion strength between nano silica(SiO2)and biobased polyamide 56(PA56)matrix and its effective dispersibility in PA56,and study the effect of nano SiO2 dispersion treatment on the properties of PA56.Two types of nano SiO2/PA56 composites were prepared by mixing modified nano SiO2(AMS)and unmodified nano SiO2(UMS)with PA56 using melt blending method,and the differences in related properties such as flowability,thermal behavior,melting and crystallization behavior between the two systems were explored.The research results indicate that both AMS and UMS exist in the form of aggregates in the PA56 matrix,and AMS has a higher dispersibility than UMS;The melt index values(MI)of AMS/PA56 composite materials and UMS/PA56 composite materials showed varying degrees of increase compared to pure PA56,with improved flow;The addition of AMS increased the thermal decomposition temperature of the composite material,while the addition of UMS decreased the thermal decomposition temperature of the composite material;The addition of UMS and AMS has little effect on the melting behavior of PA56 material and will not affect the crystal structure of PA56;However,the crystallization peak temperature of both types of nano-SiO2 composite materials is lower than that of pure PA56;The crystallinity of AMS/PA56 composite material and UMS/PA56 composite material has also been improved to varying degrees compared to pure PA56.
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