水泥基用相变微胶囊的颗粒特征与热力学性能

以石蜡、癸酸为芯材,脲醛树脂为壁材,间苯二酚为固化剂,采用原位聚合法制备相变微胶囊,采用ESEM、DSC、TGA来研究相变微胶囊颗粒形貌、粒径分布、热力学性能,以及相变微胶囊掺入水泥基体中的微观形貌.结果表明:微胶囊表面光滑,结构紧致;石蜡微胶囊的相变温度和相变焓分别是54.6℃和61.43 J/g,而癸酸微胶囊的相.变温度和相变焓分别是29.7℃和90.73 J/g;加入固化剂使得微胶囊产率从50％提升到78％以上;30次温度循环石蜡微胶囊相变晗无损失,癸酸微胶囊相变焓损失了31％;微胶囊在水泥基中分布均匀,形貌保存良好.

Particle Characteristic and Thermodynamic Properties of Phase Change Microcapsules for Cement Matrix

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.