MUF-n-十八烷相变微胶囊：核pH值和核壳比对微胶囊形态及热性能的影响

MUF-n-Octadecane Phase-Change Microcapsules: Effects of Core pH and Core-Wall Ratio on Morphology and Thermal Properties of Microcapsules.

作者信息

Lin Lin, Li Ziqi, Zhang Jian, Ma Tonghua, Wei Renzhong, Zhang Qiang, Shi Junyou

机构信息

School of Agricultural Engineering and Food Science, Shandong University of Technology, Zibo 255000, China.

Key Laboratory of Wooden Materials Science and Engineering of Jilin Province, Beihua University, Jilin 132013, China.

出版信息

Molecules. 2024 Oct 10;29(20):4794. doi: 10.3390/molecules29204794.

DOI:10.3390/molecules29204794

PMID:39459163

原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC11510695/

Abstract

Phase change energy storage microcapsules were synthesized in situ by using melamine-formaldehyde-urea co-condensation resin (MUF) as wall material, n-octadecane (C18) as core material and styryl-maleic anhydride copolymer (SMA) as emulsifier. Fourier transform infrared spectroscopy, scanning electron microscopy, differential scanning calorimetry and thermogravimetric analysis were used to study the effects of emulsifier type, emulsifier dosage, core-wall ratio and pH on the morphology and thermal properties of microcapsules. The results show that the pH of core material and the ratio of core to wall have a great influence on the performance of microcapsules. SMA emulsifiers and MUF are suitable for the encapsulation of C18. When the pH is 4.5 and the core-wall ratio is 2/1, the latent heat and encapsulation efficiency of phase transition reaches 207.3 J g and 84.7%, respectively. The prepared phase-change microcapsules also have good shape stability and thermal stability.

摘要

以三聚氰胺 - 甲醛 - 尿素共缩聚树脂（MUF）为壁材、正十八烷（C18）为芯材、苯乙烯 - 马来酸酐共聚物（SMA）为乳化剂原位合成了相变储能微胶囊。采用傅里叶变换红外光谱、扫描电子显微镜、差示扫描量热法和热重分析研究了乳化剂类型、乳化剂用量、芯壁比和pH值对微胶囊形态和热性能的影响。结果表明，芯材的pH值和芯壁比对微胶囊的性能有很大影响。SMA乳化剂和MUF适合于C18的包封。当pH值为4.5且芯壁比为2/1时，相变潜热和包封率分别达到207.3 J/g和84.7%。制备的相变微胶囊还具有良好的形状稳定性和热稳定性。