MF/C18微胶囊悬浮液相变过程中的黏度特性
Viscosity of Aqueous Suspension of MF/C18 Microcapsules During Phase Transition
常包虎 1贾莉斯 1陈颖 1莫松平 1王智彬 1邓卓夫1
作者信息
- 1. 广东工业大学材料与能源学院,广州 510006
- 折叠
摘要
本文以正十八烷(C18)为芯材,三聚氰胺甲醛树脂(MF)为壳材,采用原位聚合法得到粒径均匀的MF/C18微胶囊;以十二烷基硫酸钠作活性剂,采用两步法得到分散稳定的MF/C18微胶囊悬浮液.在此基础上,采用旋转流变仪测试MF/C18微胶囊悬浮液的黏度,重点探讨了微胶囊的固-液相变对悬浮液黏度的影响.结果显示,MF/C18微胶囊发生熔化会导致其悬浮液的黏度增大,发生凝固会导致悬浮液黏度减小,且随着升温、降温速率的增大,MF/C18微胶囊悬浮液的黏度均呈现减小的变化趋势.
Abstract
Microcapsules with n-octadecane(C18)as the phase change material(PCM)and melamine formaldehyde resin(MF)as the shell material were synthesized by a in-situ polymerization method.The resultant MF/C18 microcapsules showed uniform size distribution.MF/C18 microcapsule sus-pension was then prepared by a two-step method and the sodium dodecyl sulfate was used as the surfactant.The viscosity of the MF/C18 microcapsule suspension obtained was measured using a rotational rheometer,and the effect of the solid-liquid phase transition on the viscosity of the micro-capsule suspension was investigated detailedly.It was found the MF/C18 microcapsule suspension showed higher viscosity during melting process and lower viscosity during solidification process,com-pared to the single-phase microcapsule suspension.Moreover,the viscosities of MF/C18 microcapsule suspension during the melting and solidification processes decreased with the increase of heating and cooling rates,respectively.
关键词
相变微胶囊/微胶囊悬浮液/黏度/温度/相变Key words
PCM microcapsule/microcapsule suspension/viscosity/temperature/phase transition引用本文复制引用
出版年
2024
NETL
NSTL
万方数据