Preparation of cyclodextrin microspheres modified epoxy resin and X-ray penetration mechanism of carbon fiber composites

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.