离子液体改性石墨烯的制备及其对ABS复合材料导热性能的影响

Preparation of ionic liquid modified graphene and its effect on thermal conductivity of ABS composites

摘要:

合成了一种氨基功能化离子液体[HAIM]BF4，并将其应用于石墨烯的改性。通过绿色直接的球磨法，将G粉与1-己基-3-氨乙基咪唑四氟硼酸离子液体[HAIM]BF4相结合，制备出离子液体功能改性石墨烯（G@ILs）。所得G@ILs使用熔融共混法加入丙烯腈-丁二烯-苯乙烯共聚物（ABS）中，制备G@ILs/ABS复合材料。使用X射线衍射分析（XRD），X射线光电子能谱（XPS），扫描电子显微镜（SEM），透射电子显微镜（TEM）和拉曼测试等多种手段对G@ILs的结构和性质进行分析。结果表明，[HAIM]BF4通过阳离子-π相互作用对石墨烯进行了有效修饰，保持了石墨烯的结构完整性。由于G@ILs的独特性能，G@ILs/ABS复合材料在机械性能方面表现出相当大的改善。加入1 wt.%G@ILs的G@ILs/ABS复合材料的拉伸强度和弯曲模量为42.4 MPa和2145.1 MPa，比ABS提高了8.36%和12.76%。此外，在加入1 wt.%G@ILs的G@ILs/ABS复合材料的导热系数为0.249 W·m-1·k-1，比纯ABS提高了21.5%。

Abstract:

The 1-hexyl-3-aminoethylimidazolium tetrafluoroborate ionic liquid [HAIM]BF4 was synthesized and applied to the modification of graphene. The ionic liquids modified graphene (G@ILs) were prepared by combining G powder with 1-hexyl-3-aminoethylimidazolium tetrafluoroborate ionic liquid [HAIM]BF4 via a green and ball milling method. The resulting G@ILs were incorporated into acrylonitrile-butadiene-styrene copolymer (ABS) using a melt blending method to prepare G@ILs/ABS composites. The structure and properties of G@ILs were analyzed using various means such as X-ray diffraction analysis (XRD), X-ray photoelectron spectroscopy (XPS), scanning electron microscopy (SEM), transmission electron microscopy (TEM) and Raman testing. The results show that [HAIM]BF4 effectively modifies graphene through cation-π interactions and maintains the structural integrity of graphene. The G@ILs/ABS composites exhibited considerable improvement in mechanical properties due to the unique properties of G@ILs. The tensile strength and bending modulus of G@ILs/ABS composite with 1%G@ILs are 42.40 MPa and 2145.01 MPa, which are 8.36% and 12.76% higher than that of ABS. In addition, the thermal conductivity of G@ILs/ABS composite with 1%G@ILs is 0.249 W·m-1·k-1, which is 21.5% higher than that of pure ABS.