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以油酸为分散稳定剂,在石蜡中热分解甲酸铜-辛胺配合物前驱体,制备了油酸修饰Cu2O微晶/石蜡复合材料(Cu2O-OA/PW)。通过XRD、SEM、TEM、IR和DSC对复合材料的物相、微观形貌、化学状态及相变行为进行了表征,并对其热敏性、热膨胀性和热稳定性及影响因素进行了分析研究。结果表明:通过改变油酸浓度和前驱体浓度能够获得十二面体和立方体Cu2O微晶。油酸分子化学吸附在Cu2O微晶表面。与纯石蜡相比,Cu2O-OA/PW复合材料的相变温度基本不变,但其相变潜热明显降低。Cu2O-OA/PW复合材料的热敏性随前驱体浓度的增加而提高,但其热膨胀性有所下降。经过多次加热后,Cu2O-OA/PW复合材料未出现分层现象,体现了其优异的热稳定性。
Oleic acid-modified Cu2O microcrystalline / paraffin composites (Cu2O-OA / PW) were prepared by thermally decomposing copper (II) -octylamine complex precursors with oleic acid as a dispersion stabilizer in paraffin. The phase, microstructure, chemical state and phase transition behavior of the composites were characterized by XRD, SEM, TEM, IR and DSC. The thermal sensitivity, thermal expansion, thermal stability and influencing factors were also studied. The results show that dodecahedron and cubic Cu2O crystallites can be obtained by changing the oleic acid concentration and precursor concentration. Oleic acid molecules chemisorbed on Cu2O crystallite surface. Compared with pure paraffin, the phase transition temperature of Cu2O-OA / PW composites is basically unchanged, but the latent heat of phase transformation is obviously decreased. The thermal sensitivity of Cu2O-OA / PW composites increases with the increase of precursor concentration, but its thermal expansibility decreases. After repeated heating, the Cu2O-OA / PW composite did not delaminate, which reflected its excellent thermal stability.