天津工业大学学报2025，Vol.44Issue(5)：16-22,29,8.DOI:10.3969/j.issn.1671-024x.2025.05.003
基于PTFE膜乳化技术的粒径可控相变微胶囊的制备
Preparation of particle size-controlled phase change microcapsules based on PTFE membranes emulsification technology
摘要
Abstract
In order to solve the problem that the particle size and distribution of microcapsules are difficult to control,n-Oct@PMMA phase change microcapsules with controllable and uniform particle size distribution were prepared using biaxially stretched polytetrafluoroethylene(PTFE)membrane emulsification technology with n-octadecane(n-Oct)as the core material and poly(methyl methacrylate)(PMMA)as the wall material.The chemical struc-ture,surface morphology,thermal and crystalline properties of the microcapsules were characterized using FT-IR,SEM,DSC,TG,and XRD.The results show that the biaxially stretched PTFE membrane emulsification technology can control the particle size of n-Oct@PMMA phase-change microcapsules by adjusting the mem-brane pore size,and the prepared n-Oct@PMMA phase change microcapsules have a uniform distribution of particle size.With the increase of continuous phase rotation speed or the decrease of operating pressure,the av-erage particle size of the microcapsules after membrane emulsification decreases,the distribution becomes more uniform,and the thermal performance and thermal stability are better.When the membrane pore size is 0.45 μm,the working pressure is 50 kPa,and the surface flow rate is 2 600 r/min,the prepared microcapsules exhibit the most uniform particle size(with an average particle size of 2.95 μm and a polydispersity index of 0.03),the best surface morphology,optimal thermal performance and thermal stability.Additionally,the microcapsules under this condition have an encapsulation efficiency of 70%and a phase-change enthalpy value of 158.35 J/g.关键词
聚四氟乙烯(PTFE)膜乳化/正十八烷/相变微胶囊/膜孔径/粒径Key words
polytetrafluoroethylene(PTFE)membrane emulsification/octadecane/phase change microcapsules/membrane pore size/particle size引用本文复制引用
王建平,王喜睿,王学晨,刘海辉,李伟,张兴祥..基于PTFE膜乳化技术的粒径可控相变微胶囊的制备[J].天津工业大学学报,2025,44(5):16-22,29,8.基金项目
国家自然科学基金项目(21875163) （21875163）
