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10 d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%.