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将氨基改性纳米二氧化硅(RNS)和甲基改性纳米二氧化硅(DNS)分别加入到聚甲醛(POM)基体中,采用熔融共混法在双螺杆挤出机上制备出POM/RNS和POM/DNS纳米复合材料,并对其力学性能、热性能及结晶行为进行了研究。结果表明,当RNS和DNS的含量较低时,可以提高纳米复合材料的拉伸强度和缺口冲击强度,随着纳米填料含量的增加呈先增加后降低的趋势;而弹性模量则随着纳米填料含量的增加而不断增加;RNS的加入能够大幅度提高POM的热分解温度,而DNS则对POM的最大热分解温度影响不大;RNS和DNS均具有较强的异相成核能力,它们的加入可以促进POM结晶温度的上升,并导致POM晶粒尺寸减小。
Amino-modified nano-silica (RNS) and methyl-modified nano-silica (DNS) were added to POM matrix respectively. POM / RNS And POM / DNS nanocomposites, and their mechanical properties, thermal properties and crystallization behavior were studied. The results show that when the content of RNS and DNS is low, the tensile strength and notched impact strength of nanocomposites can be increased, and then increase with the increase of nanofiller content and then decrease. The elastic modulus of nanocomposites increases with the increase of nanostructures The content of filler increased with the increase of RNS. The addition of RNS could greatly increase the thermal decomposition temperature of POM, but DNS had little effect on the maximum pyrolysis temperature of POM. Both RNS and DNS had strong heterogeneous nucleation ability, Can promote the increase of POM crystallization temperature and lead to the decrease of POM grain size.