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以掺杂金属Fe3+、Zr4+、Ce4+的TiO2纳米粒子及TiO2纳米粒子填充聚乙烯醇(PVA)改性密胺甲醛树脂为微胶囊复合壁材,以十四烷为芯材,采用原位聚合法制备了掺杂TiO2纳米粒子填充PVA改性囊壁的相变微胶囊.考察了掺杂TiO2纳米粒子对微胶囊机械性能、热性能及表面形态的影响,采用FT-IR、TG和SEM等方法对其进行了表征.结果表明,当囊壁中均匀地掺杂纳米TiO2后,微胶囊的机械强度增大,芯材释放率减小.当壁材中Fe3+掺杂纳米TiO2质量分数为0.5％时,微胶囊破损率为18.5％,芯材10d释放率为22.6％.“,”Phase change microcapsules are prepared by in-situ polymerization,using melamine formaldehyde resin modified by polyvinyl alcohol filled with Fe3+,Zr4+ or Ce4+-doped nano-TiO2 particles as the wall,and phase change material n-tetradecane as the core.Effects of the doped nano-TiO2 particles on the mechanical property,thermal property and surface morphology of microcapsules are studied by FT-IR,TG and SEM.The results show that the mechanical strength of microcapsules will increase and the release rate of core material will decrease when the doped nano-TiO2 particles are dispersed evenly in the wall material of microcapsules.The cracking ratio of microcapsules is 18.5％ and the release rate of core material is 22.6％ in ten days when the mass fraction of Fe3+-doped nano-TiO2 in wall material of microcapsules is 0.5％.