Preparation of cyclodextrin microspheres modified epoxy resin and X-ray penetration mechanism of carbon fiber composites
Ling-qi ZHENG1, Gang LI1,*(), Xiao-ping YANG1, Qiang LI2, Ling-fei SHI3
1 State Key Laboratory of Organic-Inorganic Composites, Beijing University of Chemical Technology, Beijing 100029, China 2 Weifang Science and Technology Cooperation Center, Weifang 261000, Shandong, China 3 First Research Institute of Ministry of Public Security, Beijing 100048, China
Cyclodextrin microspheres (CDMS) was synthesized by 4, 4'-dicyclohexylmethane diisocyanate and β-cyclodextrin, and applied to prepare the cyclodextrin microspheres modified epoxy resin(CDEP). The microscopic morphology and dispersibility of CDMS in epoxy resin were characterized. Crosslinking density and dielectric properties of CDMS modified epoxy resin were investigated.The T300 carbon fiber fabric/modified epoxy composite was prepared. The X-ray penetration properties of the composite were investigated and X-ray penetration mechanism was proposed. The results show that the dispersibility of spherical CDMS in epoxy resin is good and its average diameter is about (11.5±2) μm. As mass fraction of CDMS is increased from 0% to 5%, the crosslink density of epoxy resin is reduced from 2.50×10-2 mol·cm-3 to 2.35×10-2 mol·cm-3 and dielectric constant is decreased from 4.10 to 3.43. X-ray penetration of composites is increased from 94.97% to 96.82% at 30 kV tube voltage. The number of collisions of X-rays inside the composite is reduced by the cavity structure of the microspheres, which effectively improves the X-ray penetration performance of composites.
HE Y , XIAO J W , YAO Z W , et al. Effect of surface physical structures on interfacial shear strength of carbon fibers reinforced epoxy resin composite[J]. Journal of Materials Engineering, 2019, 47 (2): 146- 152.
GAO K , SUN B G , YANG Z Y , et al. Improvement research progress in the dielectric properties of resin matrix for wave-transparent composites[J]. Journal of Functional Materials, 2015, 46 (Suppl 2): 44- 48.
GU J , DONG W , XU S , et al. Development of wave-transparent, light-weight composites combined with superior dielectric performance and desirable thermal stabilities[J]. Composites Science and Technology, 2017, 144, 185- 192.
VOLKSEN W , MILLER , ROBERT D , et al. Low dielectric constant materials[J]. Chemical Reviews, 2010, 110 (1): 56- 110.
ZHAO X Y , LIU H J . Review of polymer materials with low dielectric constant[J]. Polymer International, 2010, 59 (5): 597- 606.
HUANG W P . Low dielectric constant polymer[J]. Synthetic Materials Aging and Application, 2008, 37 (2): 39- 44.
WANG J Y , YANG S Y , HUANG Y L , et al. Synthesis and properties of trifluoromethyl groups containing epoxy resins cured with amine for low Dk materials[J]. Journal of Applied Polymer Science, 2012, 124 (3): 2615- 2624.
MAEX K . Porous low dielectric constant materials for microelectronics[J]. Journal of Applied Physics, 2006, 364, 201- 215.
TANG Y , YUAN L , LIANG G , et al. High performance low-kcyanate ester resins with a thermally stable cyclodextrin microsphere[J]. RSC Advances, 2014, 4 (31): 16136- 16145.
ZHAO C , WEI X , HUANG Y , et al. Preparation and unique dielectric properties of nanoporous materials with well-controlled closed-nanopores[J]. Physical Chemistry Chemical Physics, 2016, 18 (28): 19183- 19193.