【摘要】 目的研究Span-80/Tween-80和SDBS/曲拉通X-100这2种复配乳化剂的不同HLB值(表面活性剂的亲水亲油平衡值)对正十四烷/蜜胺树脂微胶囊团聚现象的影响。方法调节2个系列复配乳化剂的HLB值,通过原位聚合法制备正十四烷/蜜胺树脂相变微胶囊。制备的相变微胶囊采用傅里叶变换红外光谱法(FTIR)、扫描电子显微镜(SEM)、差示扫描量热法(DSC)、热重分析法(TG)表征其化学结构、表面形貌和热学性能。结果使用Span-80/Tween-80复配乳化剂制备相变微胶囊,当Span-80/Tween-80复配乳化剂的HLB值为12.03时,微胶囊表面形貌和热性能良好,且团聚现象最少。使用SDBS/曲拉通X-100复配乳化剂制备微胶囊,当HLB值为12.78时,相变微胶囊的表面形貌、粒径分布和分散性均较好,团聚现象少,潜热较高,为135.6 J/g,热稳定性较好。结论乳化剂HLB值对蜜胺树脂相变微胶囊性能有重要影响。更多还原

【Abstract】 The work aims to study the effect of different HLB values(hydrophilic lipophilic balance of surfactant) of compound emulsifiers Span-80/Tween-80 and SDBS/Triton X-100 on agglomeration phenomenon of n-tetradecane/melamine-formaldehyde shell microcapsules. The HLB value of two series of compound emulsifiers were adjusted. N-tetradecane/melamine-formaldehyde shell microcapsules were prepared through in-situ polymerization. The chemical structure, morphology and thermal properties of the prepared phase change microcapsules were observed by fourier transform infrared spectroscopy(FTIR), scanning electronic microscope(SEM), differential scanning calorimeter(DSC) and thermogravimetry analysis(TGA). Phase change microcapsules prepared with compound emulsifier Span-80/Tween-80 had good morphologies and thermal properties, and less agglomeration phenomenon when the HLB of compound emulsifier Span-80/Tween-80 was 12.03. Microcapsules prepared with compound emulsifier SDBS/Triton X-100 had good morphologies, particle size distribution & dispersity, thermal stability and less agglomeration phenomenon when the HLB was 12.78. A higher latent heat of 135.6 J/g was obtained. Emulsifier’s HLB has significant influences on melamine-formaldehyde phase change microcapsules.更多还原