Meng Fanfan, Li Xiaopeng, Zhang Min, Zhao Yue, Li Zenghe, Zhang Shouxin, Li Heguo
College of Chemistry, Beijing University of Chemical Technology, Beijing 100029, China.
State Key Laboratory of NBC Protection for Civilian, Beijing 100191, China.
Polymers (Basel). 2024 Nov 26;16(23):3291. doi: 10.3390/polym16233291.
To improve the poor thermal conductivity of microencapsulated phase change materials (MPCMs), a strategy was designed with effective combinations between graphene nanosheets (GNs) and shells to prepare thermally conductive MPCMs-GNs by using cellulose nanofibers (CNFs) to assist GN dispersion. The experiments and theoretical calculations both illustrated that CNFs effectively prevented GNs from aggregating due to the strong Van der Walls interactions between CNFs and GNs. The morphologies and structures of MPCMs with and without GNs were characterized by SEM, FTIR and XRD. The thermal properties of MPCMs were evaluated by DSC, TG, and a thermal conductivity test. The MPCMs with 10 wt.% GNs exhibited a melting enthalpy as high as 187.2 J/g and a thermal conductivity as high as 1.214 (W/m⋅K). The results indicate that the prepared MPCMs possessed a good thermal stability. In addition, MPCMs-GNs exhibited outstanding mechanical properties using a nano-indentation test. With an excellent melting enthalpy and thermal conductivity, the prepared MPCMs-GNs/textile showed a potential ability to be used for comfort thermal regulation.
为改善微胶囊相变材料（MPCMs）较差的热导率，设计了一种策略，通过有效结合石墨烯纳米片（GNs）与壳层，利用纤维素纳米纤维（CNFs）辅助GNs分散来制备导热MPCMs-GNs。实验和理论计算均表明，由于CNFs与GNs之间存在强范德华相互作用，CNFs有效防止了GNs的聚集。采用扫描电子显微镜（SEM）、傅里叶变换红外光谱（FTIR）和X射线衍射（XRD）对含GNs和不含GNs的MPCMs的形貌和结构进行了表征。通过差示扫描量热法（DSC）、热重分析法（TG）和热导率测试对MPCMs的热性能进行了评估。含10 wt.% GNs的MPCMs的熔化焓高达187.2 J/g，热导率高达1.214（W/m⋅K）。结果表明，所制备的MPCMs具有良好的热稳定性。此外，通过纳米压痕测试表明MPCMs-GNs具有优异的力学性能。所制备的MPCMs-GNs/纺织品具有优异的熔化焓和热导率，显示出用于舒适热调节的潜在能力。
