关键词: 原位聚合;相变微胶囊;颗粒特征;热力学性能;水泥

Abstract: With using paraffin and capric acid as capsule the core material,urea-formaldehyde resin as the capsule shell material and resorcinol as the curing agent,a microcapsule suitable for application in cement based materials was prepared by in situ polymerization method.ESEM,DSC and TGA were used to study the morphology,particle size distribution,thermodynamic properties of the phase change microcapsules and the microscopic morphology of microcapsule and cement based materials was observed.The results show that the microcapsules have a regular spherical shape with smooth surface and compact capsule wall.Phase change temperature and enthalpy of paraffin microcapsule are 54.6 ℃ and 61.43 J/ g,capric microcapsule acid are 29.7 ℃ and 90.73 J/g.Adding curing agent increased the productivity of microcapsules from 50％ to more than 78％.With 30 temperature cycle,enthalpy of the capric acid microcapsule have reduced by 31％ and the paraffin microcapsule had no loss.MPCMs well distributed in the cement matrix has no rupture.

Key words: in situ polymerization;MPCMs;particle characteristic;thermodynamic property;cement