Viscosity of Aqueous Suspension of MF/C18 Microcapsules During Phase Transition
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.
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