Preparation and electromagnetic interference shielding performance of epoxy composites modified with three-dimensional graphene aerogels
Yu CHEN1,2, Dai-jun ZHANG1,2,*(), Jun LI1,2, Jia-xuan WEN1,2, Xiang-bao CHEN1,2,*()
1 Soft Materials Technology Center, AECC Beijing Institute of Aeronautical Materials, Beijing 100095, China 2 National Key Laboratory of Advanced Composites, AECC Beijing Institute of Aeronautical Materials, Beijing 100095, China
Graphene aerogels/epoxy composites were prepared by vacuum-impregnated process with graphene aerogels as the functional filler and epoxy resin as polymer matrix. The changes in chemical structure of graphene aerogels during the preparation process and carbonization treatment were investigated by FT-IR, XPS and XRD. The results show that GO@PAA aerogel is prepared by the physical interaction between graphene oxide (GO) and polyamide acid (PAA). PAA will be transformed to polyimide by imidization and graphene oxide is partially reduced during the 300 ℃ thermal treatment. With the carbonation temperature increases, reduction degree of graphene sheets and the carbonation degree of polyimide are increased gradually. Meanwhile, SEM images and OM images show that graphene aerogels can also maintain the good three-dimensional network structure after carbonation treatment and vacuum impregnation. On this basis, graphene aerogels, which serve as the functional filler, taking advantage of the good three-dimensional network structure, can improve the corresponding composites with good electrical property and electromagnetic interference shielding performance. With only 6.23%(mass fraction) graphene aerogels (G@C-1100), the corresponding composites exhibit high electrical conductivity of 252 S·m-1 and an excellent electromagnetic interference shielding effectiveness of 70 dB.
GONG C H , ZHANG Y , YAN C , et al. Electromagnetic shielding behavior of composites containing ultrafine Ni fibers[J]. Rare Metal Materials and Engineering, 2010, 39 (7): 1298- 1301.
SACHDEV V K , PATEL K , BHATTACHARYA S , et al. Electromagnetic interference shielding of graphite/acrylonitrile butadiene styrene composites[J]. Journal of Applied Polymer Science, 2011, 120, 1100- 1105.
ANDERSON R A S , DIPAK K , BLUMA G S . Microwave dielectric properties and EMI shielding effectiveness of poly(styrene-b-styrene-butadiene-styrene) copolymer filled with PAni.Dodecylbenzenesulfonic acid and carbon black[J]. Polymer Engineering and Science, 2012, 52 (9): 2041- 2048.
WANG R , YANG H , WANG J L , et al. The electromagnetic interference shielding of silicone rubber filled with nickel coated carbon fiber[J]. Polymer Testing, 2014, 38, 53- 56.
XIANG C S , PAN Y B , GUO J K . Electromagnetic interference shielding effectiveness of multiwalled carbon nanotube reinforced fused silica composites[J]. Ceramics International, 2007, 33, 1293- 1297.
SONG W L , CAO M S , LU M M , et al. Flexible graphene/polymer composite films in sandwich structures for effective electromagnetic interference shielding[J]. Carbon, 2014, 66, 67- 76.
CHEN Z P , XU C , MA C Q , et al. Lightweight and flexible graphene foam composites for high-performance electromagnetic interference shielding[J]. Advanced Materials, 2013, 25 (9): 1296- 1300.
JIA J J , SUN X Y , LIN X Y , et al. Exceptional electrical conductivity and fracture resistance of 3D interconnected graphene foam/epoxy composites[J]. ACS Nano, 2014, 8 (6): 5774- 5783.
GUI X C , WEI J Q , WANG K L , et al. Carbon nanotube sponges[J]. Advanced Materials, 2010, 22, 617- 621.
CHEN Y , ZHANG H B , YANG Y B , et al. High-performance epoxy nanocomposites reinforced with three-dimensional carbon nanotube sponge for electromagnetic interference shielding[J]. Advanced Functional Materials, 2016, 26, 447- 455.
CHEN Y , ZHANG H B , WANG M , et al. Phenolic resin-enhanced three-dimensional graphene aerogels and their epoxy nanocomposites with high mechanical and electromagnetic interference shielding performances[J]. Composites Science and Technology, 2017, 152, 254- 262.
ZHANG Y F , FAN W , HUANG Y P , et al. Graphene/carbon aerogels derived from graphene crosslinked polyimide as electrode materials for supercapacitors[J]. RSC Advances, 2015, 5 (2): 1301- 1308.
QI S Y , CHI W D , SHEN Z M . Studies of the structural conversion and property change of polyimide (PI) film during the carbonization[J]. Journal of Materials Science & Engineering, 2007, 25 (1): 115- 117.
HUANG Y , LI N , MA Y F , et al. The influence of single-walled carbon nanotube structure on the electromagnetic interference shielding efficiency of its epoxy composites[J]. Carbon, 2007, 45, 1614- 1621.
LIANG J , WANG Y , HUANG Y , et al. Electromagnetic interference shielding of graphene/epoxy composites[J]. Carbon, 2009, 47, 922- 925.
ZHANG H B , ZHENG W G , YAN Q , et al. The effect of surface chemistry of graphene on rheological and electrical properties of polymethylmethacrylate composites[J]. Carbon, 2012, 50, 5117- 5125.