摘要
采用化学氧化法制备了不同膨胀体积的膨胀石墨(EG),通过聚丙烯酸酯对不同膨胀体积的EG进行包覆改性,利用改性后的EG制备改性EG/聚酰胺66(PA66)复合材料,研究了不同膨胀体积的改性EG对复合材料力学性能和导热性能的影响。结果表明,EG经丙烯酸酯改性后,EG的表面粗糙度和活性基团明显增加;复合材料弹性模量和弯曲强度均随改性EG膨胀体积的增加而增加,与未膨胀石墨相比,分别提升了36.1%、25.8%;拉伸强度、断裂伸长率和热导率随膨胀体积的增加呈先增加后减小的趋势。拉伸强度在EG膨胀体积为40 mL/g时达到最大值,为75.6 MPa;热导率在膨胀体积为20 mL/g时最佳,为2.56 W/(m·k),与未膨胀石墨相比,拉伸强度和热导率分别提升了33.3%和30.1%。
Expanded graphite(EG)with different expansion volume was prepared by chemical oxidation method.Modified EG was prepared by encapsulating polyacrylate with different expansion ratio of EG.Modified EG/polyamide 66(PA66)composite was prepared by modified EG.The effects of modified EG with different expansion volume on mechanical properties and thermal conductivity of the composite was studied.The results showed that the surface roughness and reactive groups of EG increased obviously after acrylate modification.The elastic modulus and flexural strength of composite increased with the expansion volume of modified EG,compared with unexpanded graphite.The increase was 36.1%and 25.8%,respectively;the tensile strength,elongation at break and thermal conductivity increased first and then decreased with the increase of expansion volume.The tensile strength reaches a maximum value of 75.6 MPa when the EG expansion volume was 40 mL/g;the thermal conductivity was preferably 2.56 W/(m·k)when the expansion volume was 20 mL/g,which was compared with unexpanded graphite.The tensile strength and thermal conductivity increased by 33.3%and 30.1%,respectively.
作者
陆佳华
邹敏
安昀
LU Jiahua;ZOU Min;AN Yun(College of Materials Science and Engineering,Xihua University,Chengdu,Sichuan 610039,China;Panzhihua University,Panzhihua,Sichuan 617000,China)
出处
《塑料》
CAS
CSCD
北大核心
2020年第1期27-30,共4页
Plastics
