Liu Jinyun, Wu Yong, Zhang Wen, Long Jiawei, Zhou Ping, Chen Xi
Key Laboratory of Functional Molecular Solids, Ministry of Education, College of Chemistry and Materials Science, Anhui Normal University, Wuhu 241002, China.
Institute of Intelligent Machines, Chinese Academy of Sciences, Hefei 230031, China.
Polymers (Basel). 2019 Jan 24;11(2):199. doi: 10.3390/polym11020199.
Encapsulating under-cooling materials has been a promising strategy to address the compatibility issue with a surrounding matrix. Herein, we present the synthesis of a uniform alkane-infilled capsule system that shows obvious under-cooling properties. As demonstrating examples, -hexadecane was selected as a liquid alkane and -eicosane as a solid in our systems as core materials via in-situ polymerization, respectively. The under-cooling properties of capsules were investigated using differential scanning calorimetry, real-time optical observations with two polarizers, and molecular modeling. The -hexadecane encapsulated capsules exhibited a large under-cooling temperature range of 20 °C between melt and crystallization, indicating potential applications for structure-transformation energy storage. In addition, molecular modeling calculations confirmed that the solid forms of -hexadecane and -eicosane are more stable than their liquid forms. From liquid to solid form, the -hexadecane and -eicosane release energies were 4.63 × 10³ and 4.95 × 10³ J·g, respectively.
封装过冷材料一直是解决与周围基体相容性问题的一种有前景的策略。在此，我们展示了一种均匀的烷烃填充胶囊体系的合成，该体系表现出明显的过冷特性。作为示例，在我们的体系中，分别通过原位聚合选择正十六烷作为液态烷烃、正二十烷作为固态作为核心材料。使用差示扫描量热法、双偏振器实时光学观察和分子模拟研究了胶囊的过冷特性。封装正十六烷的胶囊在熔化和结晶之间表现出20℃的大过冷温度范围，表明其在结构转变能量存储方面的潜在应用。此外，分子模拟计算证实正十六烷和正二十烷的固态形式比其液态形式更稳定。从液态转变为固态时，正十六烷和正二十烷的释放能量分别为4.63×10³和4.95×10³ J·g。
