【作者】 李正博； 曹梅娟； 陈丽梅； 李路海；

【Author】 Zhengbo Li;Meijuan Cao;Limei Chen;Luhai Li;Beijing Engineering Research Center of Printed Electronics,Beijing Institute of Graphic Communication;

【机构】 北京印刷学院北京印刷电子工程研究中心；

【摘要】 由于Y-Al₂O₃密度与有机溶剂的密度不匹配,导致Y-Al₂O₃颗粒在有机溶剂中凝聚,沉积。在实验中,我们首先采用三因素三水平的正交实验法,对改性实验最佳条件进行探究,优化的到最佳的实验方案。用优化后的实验方案进行改性,并对改性效果进行测试分析。我们用红外光谱仪,对键接在Y-Al₂O₃颗粒表面的硬脂酸的存在进行表征;用热重分析法对键接在V-Al₂O₃表面的硬脂酸进行估算。用DLS对硬脂酸改性前后Y-Al₂O₃粒径及PDI进行表征,用扫面电子显微镜（SEM）对V-Al₂O₃粒径和形貌进行观察分析。用亲油和亲水性,对硬脂酸的改性效果进行表征。表征得出,改性剂硬脂酸的键接量为4.41%,改性后的粒径有290nm减小到190nm。改性后,Y-Al₂O₃表面由原来的亲水变成疏水表面。纳米氧化铝的克利分布变窄。因此,硬脂酸改性氧化铝提高了分散性。实验表征表明,硬脂酸改性与未改性V-Al₂O₃相比,有更好的稳定性。更多还原

【Abstract】 It is difficult for γ-Al₂O₃ particles to disperse due to a mismatch in the density of dispersion medium,which leads to agglomeration and sedimentation of theγ-Al₂O₃ particles.In the study,we use the orthogonal experiments of three factors and three levels to analyze the influence of related factors on modification effect,and seek the most suitable modification conditions.In the experiment,the stearic acid（SA） was used to modify the surface of the γ-Al₂O₃particles.γ-Al₂O₃ particles before and after surface modification were characterized by Infrared spectroscopy（FTIR）,scanning electron microscope（SEM）,and thermal gravity analysis（TG） and dynamic light scattering（DLS） characterization.The FTIR spectra showed that SA had been successfully grafted onto the surface of the γ-Al₂O₃ particles.Thermal Gravity Analysis showed the coated amount of stearic acid is 4.41%.Moreover,after surface modification γ-Al₂O₃particles showed strong hydrophobicity,the agglomeration for the γ-Al₂O₃ particles after modification was markedly reduced,and had better dispersion property,smaller particle size and more narrow distribution.Therefore,the SA-modified γ-Al₂O₃ particles demonstrated better dispersion properties.Sedimentation test showed that the modified γ-Al₂O₃ particles had better suspension stability than the non-modified γ-Al₂O₃ particles.更多还原