Preparation of P/PEG@BN-OH coaxial nanofibers doped with BN-OH nanosheets and its thermal properties
In order to prepare the efficient and stable phase change thermal storage materials,coaxial nanofibers(P/PEG@x BN-OH)with polyacrylonitrile(PAN)as the sheath and polyethylene glycol(PEG)as the core have been pre-pared via a coaxial electrostatic spinning technique with hydroxylated boron nitride(BN-OH)nanosheets dis-persed in a core component.The effects of various contents of BN-OH on nanofiber morphology,thermal proper-ties,cycling stability,thermal energy efficiency and thermal conductivity are characterized respectively by field emission scanning electron microscopy,transmission electron microscopy,differential scanning calorimetry and infrared thermal imager.The results show that the nanofibers form a stable and continuous sheath-core coaxial structure with an average diameter between 279-335 nm,and PEG and BN-OH are encapsulated inside the PAN nanofibers with an inner diameter range of 107-188 nm.The P/PEG@x BN-OH nanofibers show excellent phase change thermal storage enthalpy(75-78 J/g)and thermal stability,and PEG shows no phase change leakage after 100 thermal cycles.The incorporated BN-OH nanosheets with mass fraction of 10.0％improves the thermal conductivity of the nanofibers by 95％,and their phase change thermal storage and release rates are increased by 67％and 154％,respectively.
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