摘要
以聚偏氟乙烯(PVDF)为基体材料,再分别以酸化多壁碳纳米管(MWCNTs-COOH)和未酸化多壁碳纳米管(MWCNTs)为填料,通过熔融法制备了不同填料含量的MWCNTs-COOH/PVDF及MWCNTs/PVDF介电复合材料。分别采用红外光谱(FTIR)、扫描电镜(SEM)、X射线衍射(XRD)、拉伸性能测试、电性能测试、差示扫描量热分析(DSC)等方法系统研究了填料含量和碳纳米管酸化前后对复合材料的热性能、力学性能和电性能的影响。XRD测试表明,填料MWCNTs-COOH和MWCNTs的加入促进了PVDF中β晶的生成。力学性能分析表明,MWCNTs-COOH和PVDF形成的界面结合力更强,复合材料的力学强度更高,当MWCNTs-COOH的质量分数为12%时,复合材料的拉伸强度可达64.6 MPa,较纯PVDF提高了24%。介电性能分析表明:未酸化的多壁碳纳米管更容易在PVDF基中构成局部导电网络,促进电子位移极化,提高复合材料的介电常数,并在MWCNTs的质量分数为12%时达到渗流阈值,介电常数达到了286,是纯PVDF的36倍。DSC测试表明,随着填料的增加,介电复合材料的结晶温度、熔融温度和结晶度都相较于纯PVDF得到了提高。
Polyvinylidene fluoride(PVDF)was used as matrix,acidified multi-walled carbon nanotubes(MWCNTs-COOH)and unacidified multi-walled carbon nanotubes as functional fillers and MWCNTs-COOH/PVDF,MWCNTs/PVDF composites with different fillers contents were prepared by melt blending.FTIR,SEM,XRD,tensile test,electrical property test,DSC,and other methods were used to study the influence of MWCNTs content and before and after acidification of carbon nanotubes on thermal properties,mechanical properties and electrical properties of the prepared composites.XRD test showed that the addition of MWCNTs-COOH and MWCNTs promoted the formation ofβcrystal of PVDF.Mechanical analysis showed that interfacial interactions between the MWCNTs-COOH and PVDF was stronger,resulting in the higher mechanical strength of the composites.When the filler contents of MWCNTs-COOH was 12wt%,the tensile strength of the composites reached 64.6 MPa,which increased by 24%compared with pure PVDF.The dielectric property analysis showed that the unacidified multi-walled carbon nanotubes were more likely to form local conductive networks in the PVDF matrix,promoting the electron displacement polarization and improving the dielectric constant.When the contents of MWCNTs was 12wt%,the percolation threshold was reached and the dielectric constant reached 286,which was 36 times of pure PVDF.DSC test showed that with the addition of MWCNTs-COOH and MWCNTs,the crystallization temperature,melting temperature and crystallinity of the dielectric composites were higher than those of pure PVDF.
作者
陈林
刘虹财
严磊
郭怡
林宏
蔺海兰
卞军
赵新为
CHEN Lin;LIU Hongcai;YAN Lei;GUO Yi;LIN Hong;LIN Hailan;BIAN Jun;ZHAO Xinwei(College of Materials Science and Engineering,Xihua University,Chengdu 610039,China;Department of Physics,Tokyo University of Science,1-3 Kagurazaka,Shinjuku-Ku,Tokyo 162-8601,Japan)
出处
《材料导报》
EI
CAS
CSCD
北大核心
2020年第4期126-131,共6页
Materials Reports
基金
国家教育部春晖计划合作项目(Z2018088)
西华大学大健康管理中心开放研究基金(DJKG2019-002)
西华大学西华杯大学生创新创业项目(2019051)
国家级大学生创新创业训练计划项目(201910623007)；；创新创业环境下“大材料学科”专业综合改革与建设实践教学团队项目(05050028)~~
