采用葡萄糖辅助球磨法制备了羟基化氮化硼(OH-BN),并通过原位聚合法合成了以硬脂酸十二烷基酯(DS)为芯材、三聚氰胺-尿素-甲醛(MUF)树脂与OH-BN杂化壳层为壁材的相变微胶囊(MPCMs)。利用傅里叶变换红外光谱仪和热重分析仪对OH-BN及MPCMs的化学结构和热稳定性进行了表征,同时结合扫描电子显微镜和差示扫描量热仪对MPCMs的形貌及相变储热性能进行了分析。结果表明:羟基接枝到氮化硼表面,提升了OH-BN的亲水性和分散稳定性;制备的MPCMs呈规则球形,粒径分布范围为2～8μm,OH-BN的引入增加了MPCMs表面粗糙度,并有效抑制了其过冷现象。当OH-BN质量分数为0.4%时,MPCMs的包封效率达到36.67%。此外,MPCMs表现出优异的热稳定性和较低的泄漏风险,展现了良好的应用潜力。
Hydroxylated boron nitride (OH-BN) was prepared using a glucose-assisted ball milling method.Phase change microcapsules (MPCMs) were synthesized via in-situ polymerization with dodecyl stearate (DS) as the core material and a hybrid shell of melamine-urea-formaldehyde (MUF) resin and OH-BN as the wall materials.The chemical structure and thermal stability of OH-BN and MPCMs were characterized using Fourier transform infrared spectroscopy (FT-IR) and thermogravimetric analysis (TGA),while the morphology and phase change thermal storage properties of MPCMs were systematically analyzed using scanning electron microscopy (SEM) and differential scanning calorimetry (DSC).The results indicated that hydroxyl groups were successfully grafted onto the surface of boron nitride,significantly enhancing the hydrophilicity and dispersion stability of OH-BN.The prepared MPCMs exhibited regular spherical morphology with a particle size distribution ranging from 2 to 8μm.The introduction of OH-BN increased the surface roughness of the MPCMs and effectively suppressed the supercooling phenomenon.When the mass fraction of OH-BN was 0.4%,the encapsulation efficiency of the MPCMs reached 36.67%.In addition,MPCMs exhibited excellent thermal stability and low leakage risk,showing good application potential.
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基金资助
江汉大学校级科研项目(2021yb023)
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