纳米纤维
聚偏氟乙烯
材料科学
差示扫描量热法
聚乙二醇
热重分析
复合材料
静电纺丝
复合数
PEG比率
化学工程
玻璃化转变
聚乙烯吡咯烷酮
高分子化学
聚合物
工程类
物理
财务
经济
热力学
作者
Cong Van Do,Thuy Thi Thu Nguyen,Jun Seo Park
标识
DOI:10.1016/j.solmat.2012.04.029
摘要
Polyethylene glycol (PEG)/polyvinylidene fluoride (PVDF) core/shell nanofibers were fabricated using coaxial electrospinning. In the core/shell composite nanofibers, melted PEG and PVDF solutions were coaxially electrospun (e-spun) through a double spinneret as a core layer and as a shell layer, respectively. The PEG of the core layer in the e-spun composite nanofibers is a phase-change material (PCM) that is able to store and release large amounts of thermal energy at a constant phase transition temperature. PEG was encapsulated with a PVDF shell to prevent its leakage and reduce the effect of the external environment during usage. The core/shell structure of the e-spun composite nanofiber was confirmed using water contact angle (WCA) measurements, X-ray photoelectron spectroscopy (XPS) analysis, and transmission electron microscopy (TEM). Differential scanning calorimetry (DSC) and thermogravimetric analysis (TGA) showed that the e-spun composite nanofibers had good thermal stability and energy storage capacity. PEG of three different molecular weights (MWs: 1000 Da, 2000 Da and 4000 Da) was used as the core material to prepare e-spun composite nanofibers with different melting/crystallization temperature ranges and thermal storage capacities. Among these PEGs, the WCA value of 106° of e-spun PEG4000/PVDF core/shell nanofibers is similar to that of e-spun PVDF nanofibers confirming that the core/shell nanofibers could completely encapsulate 4000 Da PEG at the highest core feed rate of 0.210 mL/h. Regarding in terms of energy storage capacity, core/shell nanofibers, fabricated at the core feed rate of 0.210 mL/h, had the largest content of PEG in the core up to 42.5 wt% with a latent heat of 68 J/g and a melting temperature of 62.8 °C. These shape-stabilized core/shell nanofibers showed good thermal reliability and sufficiently high tensile strength, leading to various potential applications related to energy storage.
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