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通过溶胶-凝胶法首先合成了二氧化硅微球,与玉米淀粉和甘油直接混合后,先用双螺杆挤出机挤出造粒,再用注塑工艺制备了二氧化硅/热塑性玉米淀粉复合材料(SiO_2/TPS),研究了共混体系中不同含量的SiO_2对复合材料的力学性能(拉伸强度、冲击强度)、动态力学性能(DMA)、以及流变加工性能(转矩流变)的影响。结果表明,随着共混体系中SiO_2含量的增加,复合材料的拉伸强度、冲击强度、次级松弛转变温度呈先上升后下降的趋势,在SiO_2含量为2%时,性能达到最佳,分别为8.78 MPa、14.85 kJ/m~2和53.64℃,而转矩流变曲线表明,此时具有较高的峰值转矩,复合材料的加工成型性能有所下降。
Firstly, silica microspheres were synthesized by sol-gel method. After mixing with corn starch and glycerol, the mixture was first extruded by a twin-screw extruder and then granulated with a silica / thermoplastic corn starch composite The mechanical properties (tensile strength, impact strength), dynamic mechanical properties (DMA) and rheological processing properties (torque rheology) of the composites with different content of SiO 2 were studied. Impact. The results show that the tensile strength, impact strength and secondary relaxation transition temperature of the composites first increase and then decrease with the increase of the content of SiO 2 in the blends. When the content of SiO_2 is 2% Respectively 8.78 MPa, 14.85 kJ / m ~ 2 and 53.64 ℃, while the torque flow curves show that at this moment, the peak torque is higher, and the processing and formability of the composites decrease.