Preparation of SiO2 Reinforced Thermoplastic Starch Composite by Injection Molding
Silica microspheres were synthesized by sol-gel process and the thermoplasticstarch (TPS)/silica (SiO2)composites were prepared through injection molding after extruding with starch and glycols.The effects of different content of SiO2 on mechanical,impact,dynamic mechanical and torque rheological properties were studied.The results indicated tensile strength,impact strength,relax-transition temperature were first increased and then decreased with the increasing content of SiO2.The tensile strength,impact strength and glass-transition temperature of SiO2/TPS reached the maximum value of 8.78 MPa,14.85 kJ/m2 and 53.64℃,respectively,when the SiO2 content was 2％.The torque rheological curves showed that the peak torque of SiO2/TPS was highest compared with TPS,not favorable for processability.
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