期刊
JOURNAL OF APPLIED POLYMER SCIENCE
卷 138, 期 25, 页码 -出版社
WILEY
DOI: 10.1002/app.50589
关键词
composites; graphene; and fullerenes; mechanical properties; nanotubes; thermosets
资金
- Conselho Nacional de Desenvolvimento Cientifico e Tecnologico [305123/2018-1]
- Coordenacao de Aperfeicoamento de Pessoal de Nivel Superior [001]
- Fundacao de Amparo a Pesquisa do Estado de Sao Paulo [2017/04740-0, 2018/09531-2, 2017/16970-0, 2018/07867-3]
Combining multi-walled carbon nanotube buckypapers with glass fiber/epoxy resin composites can achieve good electromagnetic interference shielding effectiveness in the X-band and Ku-band; however, adding CNT film to the composites did not improve the elastic properties but rather decreased compression shear and interlaminar shear strength.
Glass fiber/epoxy resin composites (GF/EP) using one and three multi-walled carbon nanotube buckypapers (BP) were obtained and their complex parameters, reflectivity, and electromagnetic interference (EMI) shielding effectiveness (SE) at X-band (8.2-12.4 GHz) and Ku-band (12.4-18 GHz) were evaluated. The preparation of BP used polyacrylonitrile (PAN) nanofibers (PF These composites show both large storage and energy loss capacity in both bands revealing promising results related to EMI SE applications. Besides, a high attenuation of around 67% and 72% were achieved for BP based composites. The cross-section view of the buckypaper and the laminates was analyzed by scanning electron microscopy (SEM). The incorporation of the CNT film into the laminates showed no improvements in the elastic properties through dynamic mechanical analyses (DMA). Nevertheless, a decrease in the shear properties by the compression shear test (CST) and interlaminar shear strength (ILSS) has been observed. GF/EP/BP/PF composite presented a reduction of 29 and 39% in its ILSS properties compared to the base laminate (GF/EP). Also, the decrease was even more significant, revealing a steep reduction in its CST properties. On the other hand, the removal of the pan nanofiber (PF) led to better mechanical properties for GF/EP/BP/RPF composites. Results have shown ILSS values of 47.4 +/- 2.2 MPa which are close to the base laminate (52.4 +/- 3.1 MPa). The removal of the PF provided larger porous in the CNT network, making the impregnation by epoxy easier in the BP/RPF which resulted in improved shear properties compared to GF/EP/BP/PF samples.
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