十四醇@聚苯胺微胶囊相变材料的制备及性能研究

Preparation and properties of tetradecanol@polyanilinemicroencapsulated phase change materials

以聚苯胺(polyaniline,PANI)为壳材的微胶囊相变材料(MePCMs)是一类重要的多功能MePCMs。为拓宽聚苯胺包覆的多功能MePCMs的来源,选择十四醇(tetradecanol,TD)为芯材,通过苯胺原位聚合的方法制备了TD@PANI MePCMs,探索了乳化剂种类和芯壁比等因素对所制备的MePCMs性能的影响。结果表明,乳化剂的加入不利于TD@PANI MePCMs的形成。在不加入乳化剂的反应体系中,所制备的MePCMs的包覆率和球形规整度随芯壁比的增加呈先增后减的趋势,在芯壁比为4.8∶5.2时,包覆效果最佳。优选条件下制备得到的TD@PANI MePCMs的起始相变温度为32.44℃,相变焓为102.3 J/g,包覆率为46.4%,并具有良好的热稳定性能。此外,芯材十四醇被聚苯胺包覆后其化学性质与晶体结构未发生变化。研究结果可为开发基于聚苯胺的多功能相变微胶囊打下坚实的基础。

Microencapsulated phase change materials(MePCMs)with polyaniline(PANI)as shell material are a kind of important multifunctional MePCMs.In order to broaden the source of functionalized MePCMs with PANI shell,in this work,tetradecanol(TD)was selected as core material and a series of TD@PANI MePCMs were prepared via a simple surface polymerization of aniline in the TE/water suspension.The effects of emulsifiers and core shell mass ratio on the properties of the prepared MePCMs were investigated.The results showed that the addition of emulsifier was unfavorable to the formation of TD@PANI MePCMs.The encapsulation ratio and spherical regularity of the obtained MePCMs prepared in the reaction system without emulsifier were increased first and then decreased with the increase of the core shell mass ratio,and the best result was obtained when the core shell mass ratio was 4.8∶5.2.The onset phase change temperature of the MePCM prepared under optimal condition was 32.44℃with a phase change enthalpy of 102.3 J/g and a encapsulation ratio of 46.4%.Besides,the prepared MePCM possesses good thermal stability.In addition,the chemical properties and crystal structure of the tetradecanol core material did not change after it being microencapsulated by PANI.The results of this study can build a solid foundation for the development of multifunctional MePCMs with PANI shell.