掺杂BN-OH纳米片的P/PEG@BN-OH同轴纳米纤维的制备及其热性能  

Preparation of P/PEG@BN-OH coaxial nanofibers doped with BN-OH nanosheets and its thermal properties

作　　者：石海峰[1] 罗建文 SHI Haifeng;LUO Jianwen(School of Material Science and Engineering,Tiangong University,Tianjin 300387,China)

机构地区：[1]天津工业大学材料科学与工程学院,天津300387

出　　处：《天津工业大学学报》2024年第2期1-9,共9页Journal of Tiangong University

基　　金：国家自然科学基金资助项目(21875163)。

摘　　要：为制备高效稳定的相变储热材料,采用同轴静电纺丝技术制备了以聚丙烯腈(PAN)为鞘、聚乙二醇(PEG)与羟基化氮化硼纳米片(BN-OH)为芯的同轴纳米纤维(P/PEG@x BN-OH),并分别通过场发射扫描电子显微镜、透射电子显微镜、差示扫描量热仪、红外热成像仪等手段分析了掺杂不同质量BN-OH纳米片对纤维形貌、热性能、循环稳定性、热能效率及热导率的影响。结果表明:纤维形成了稳定且连续的鞘-芯同轴结构,平均直径介于279~335 nm,而且PEG和BN-OH被包裹在PAN纤维内部,内径大小范围为107~188 nm;P/PEG@x BN-OH纳米纤维显示了优异的相变储热焓值(75~78 J/g)和热稳定性,经100次热循环后PEG无相变渗漏现象;掺杂质量分数为10.0%的BN-OH纳米片可将纤维的热导率提高95%,而且其相变储热和释放率分别提高了67%和154%。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 prepared via a coaxial electrostatic spinning technique with hydroxylated boron nitride(BN-OH)nanosheets dispersed in a core component.The effects of various contents of BN-OH on nanofiber morphology,thermal properties,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.

关 键 词：同轴纤维 相变材料 羟基化氮化硼 热导率 相变储热 

分 类 号：TQ340.64[化学工程—化纤工业]