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将硅烷偶联剂KH-560接枝到纳米SiO_2表面,用偶氮二异丁腈(AIBN)引发单体甲基丙烯酸甲酯(MMA)发生自由基聚合包覆纳米SiO_2,通过计算接枝率确定纳米SiO_2改性的最佳工艺条件,并对其进行红外表征.改性后的纳米SiO_2作为填料,通过双辊开炼制备聚丙烯基纳米复合材料,研究了填料添加量对复合材料的力学性能和结晶性能的影响.实验结果表明,纳米SiO_2改性的最佳工艺条件为:引发剂用量为2%,反应物质量比(单体MMA:纳米SiO_2)为2:1,改性时间为5 h;当聚丙烯与填料的质量比为100:3时,复合材料的拉伸强度达到最大值34.19 MPa,缺口冲击强度达到最大值2 kJ·m~(-2),与纯聚丙烯相比,拉伸强度和缺口冲击强度分别提高了25.7%和19.8%。
The silane coupling agent KH-560 was grafted onto the surface of nano-SiO 2, and the monomer MMA was initiated by azobisisobutyronitrile (AIBN) to undergo free radical polymerization to coat the nano-SiO 2. The graft ratio The optimum conditions for the modification of nano-SiO 2 were determined and characterized by IR.The modified nano-SiO 2 was used as filler to prepare polypropylene-based nano-composite through two-roll open-smelting, and the effect of the amount of filler added on the composites Mechanical properties and crystallization properties.The experimental results show that the optimum conditions for the modification of nano-SiO 2: the amount of initiator is 2%, the mass ratio of reactants (monomer MMA: nano-SiO 2) is 2: 1, the modification time Was 5 h. When the mass ratio of polypropylene to filler was 100: 3, the tensile strength of the composites reached 34.19 MPa and the notched impact strength reached the maximum of 2 kJ · m -2, Compared with the tensile strength and notched impact strength increased by 25.7% and 19.8%.