聚醚酰亚胺/氮化硼杂化微球的制备及其导热应用  

Preparation of polyetherimide/boron nitride hybrid microspheres and their thermally conductive application

作　　者：庞米娜 凃思帆 张海琛 陈晓烽 陈高发 易铁山 胡德超 PANG Mina;TU Sifan;ZHANG Haichen;CHEN Xiaofeng;CHEN Gaofa;YI Tieshan;HU Dechao(School of Materials and Energy,Foshan University,Foshan 528000,China)

机构地区：[1]佛山大学材料与能源学院,广东佛山528000

出　　处：《工程塑料应用》2025年第2期1-7,共7页Engineering Plastics Application

基　　金：国家自然科学基金项目(52303074)。

摘　　要：采用溶液再沉淀法制备了聚醚酰亚胺(PEI)微球,利用扫描电子显微镜探究了离心速度、离心时间、表面活性剂用量、搅拌速度等因素对PEI微球尺寸和形貌的影响;随后,通过单宁酸(TA)辅助球磨六方氮化硼,制备了TA改性的氮化硼纳米片(TA-BNNS),并将其与PEI微球进行组装,制备了PEI/TA-BNNS杂化微球;最后采用激光导热仪研究了PEI/TA-BNNS杂化微球对环氧树脂导热性能的影响。研究结果表明,当离心速度为5000r/min、离心时间为30 min,搅拌速度为500r/min时,PEI微球粒径分布较均匀、形貌较平整。此外,聚乙烯醇(PVAL)表面活性剂能有效阻止PEI微球团聚,当PVAL的加入质量为PEI的2倍时,制备得到的PEI微球尺寸最大。TA辅助球磨制备的TA-BNNS表现出优异的水分散性,与PEI微球进行组装制备的PEI/TA-BNNS杂化微球能够在环氧树脂基体中形成良好的导热通路,有效提高环氧复合材料的导热性能。当添加质量分数20%的杂化微球后,环氧复合材料的热导率可达0.62W/(m·K),复合材料的拉伸性能最高可达69.4MPa,导热性能和拉伸性能均高于添加等量无规分布填料的环氧复合材料。Polyetherimide(PEI)microspheres were prepared by using solution-reprecipitation method.Scanning electron microscopy was employed to investigate the influence of centrifugation speed,centrifugation time,surfactant dosage,and stirring speed on the size and morphology of PEI microspheres.Subsequently,tannic acid(TA)-modified boron nitride nanosheets(TABNNS)were prepared by ball milling of hexagonal boron nitride under the assistance of tannic acid,which were then assembled with PEI microspheres to obtain PEI/TA-BNNS hybrid microspheres.Finally,a laser flash apparatus was used to study the effect of PEI/TA-BNNS hybrid microspheres on the thermal conductivity of epoxy resin.The results indicate that when the centrifugation speed is 5000 r/min,centrifugation time is 30 min,and stirring speed is 500 r/min,PEI microspheres exhibit a relatively uniform particle size distribution and smooth morphology.Additionally,polyvinyl alcohol(PVAL)surfactant effectively prevent the agglomeration of PEI microspheres,and the largest PEI microspheres are obtained when the amount of PVAL is twice that of PEI.TABNNS prepared through TA-assisted ball milling exhibit excellent water dispersibility.The as-obtained PEI/TA-BNNS hybrid microspheres can form effective thermal conductivity pathways within the epoxy resin matrix,and significantly enhance the thermal conductivity of epoxy composites.It is found that the thermal conductivity of epoxy composites with 20%hybrid microspheres can reach 0.62 W/(m·K).In addition,the tensile properties of epoxy composites can reach up to 69.4 MPa.Notably,the thermal conductivity and tensile property of epoxy/PEI/TA-BNNS composites are both higher than that of the epoxy composites with equal amounts of randomly distributed fillers.

关 键 词：聚醚酰亚胺 氮化硼纳米片 杂化微球 导热性能 环氧树脂 

分 类 号：TQ323.7[化学工程—合成树脂塑料工业]