采用原位聚合法制备以三聚氰胺脲醛树脂(MUF)为壳材,以正十六烷为芯材的相变微胶囊。探究不同三聚氰胺配比对相变微胶囊形貌、化学结构、潜热性能和热稳定性的影响。采用场发射扫描电子显微镜、傅里叶红外光谱仪、差示扫描量热仪和热重分析仪对其进行检测分析。结果表明,当壳材比为 1∶1(2g三聚氰胺)时,制备的相变微胶囊包覆率高达80%,呈现规律完整球形,颗粒分明,同时具有较好的储热性能和热稳定性,其熔融温度24.6℃、熔融焓205.4J/g、结晶温度11℃、结晶焓199.6J/g。
Melamine urea-formaldehyde@n-hexadecane phase change microcapsules (MEPCM) were prepared via in-situ polymerization method with melamine urea-formaldehyde resin (MUF) as the shell material and n-hexadecane as the core material.The influence of different melamine ratios on the morphology,chemical structure,latent heat properties and thermal stability of the phase change microcapsules was investigated.Characterization and analysis were carried out using field emission scanning electron microscopy (FE-SEM),Fourier transform infrared spectroscopy (FT-IR),differential scanning calorimetry (DSC) and thermogravimetric analysis (TGA).The results showed that the prepared phase change microcapsules achieved a maximum encapsulation ratio of 80% when using a core-to-wall ratio of 1∶1(2g melamine).The phase change microcapsules exhibited a regular complete spherical shape and dispersible particles.The prepared MEPCM presented excellent heat storage performance and thermal stability.The melting temperature and enthalpy were 24.6℃ and 205.4J/g,respectively,and the crystallization temperature and enthalpy were 11℃ and 199.6J/g,respectively.
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基金资助
国家自然科学基金重点项目(52236004)
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