Studies On Modification Of Epoxy Resin With Inorganic Nanoparticles, Functionalization Of Epoxy Resin And Its Applications

Epoxy resin is an important thermoset. It is widely use in the fields of electron, machine, architecture and so on for its outstanding mechanical, adhesive and insulative properties. In this paper, progress in nano-modification of epoxy resin, synthesis of functional epoxy resin and applications of epoxy resin was reviewed. Inorganic nanoparticle modified epoxy resins and novel functional epoxy resins were prepared and characterized. Applications of the resultant epoxy resins in powder coating, electrode modification and self-assembly were investigated and the mechanisms were discussed.A novel method to prepare inorganic nanoparticle modified bisphenol A epoxy resin through in situ and inclusion polymerization was investigated. In this method, nanoparticles were added and dispersed in the system before polymerization, so the monomers could penetrate into the space among the nanoparticles. Epoxy resin grown both between and around the nanoparticles during polymerization, and nanoparticle modified epoxy resin with uniform dispersed nanoparticles in the matrix was obtained as a result. Compared with the samples prepared by blending or solution blending, the dispersion of nanoparticles in the samples prepared through in situ and inclusion polymerization was better as observed by TEM. As for the nanoparticle modified epoxy resin prepared through in situ and inclusion polymerization, the softening point was increased by 15 ℃ when 15.0 wt% of nano-CaCO₃ was loaded, the stretch strain of the cured sample with 10.0 wt% of nano-CaCO₃ was increased by nearly 3 times and the elastic modulus reached its maximum value when the nano-CaCO₃ content was 5.0 wt% owing to the interactions between the well dispersed nanoparticles and the epoxy resin chains. The industrial production of nanoparticle modified epoxy resin was realized after pilot plant experiments. The obtained nanoparticle modified bisphenol A epoxy resin can be applied in powder coating.Inorganic nanoparticle modified epoxy powder coatings were prepared using the nanoparticle modified epoxy resin obtained through in situ and inclusion polymerization as main component. The industrial production of nanoparticle modified epoxy powder coating was realized after pilot plant experiments. The storage stability and neutral salt spray corrosion resistance of the obtained nanoparticle modified epoxy powder coating were rating 1. The impact resistance was better than 50 Kg.cm. The tensile strain was 2.9 %. The angle coverage was 75 % and the cathodic disbondment resistance was 6.8 mm.Two ferrocene-based epoxy resins with different structures were prepared and characterized.The electrochemical behaviors of their films and solutions were investigated by cyclic voltammetry (CV) measurement. The relationship between the CV peak current values and the scan rate indicated that the charge transport through the films obeyed Fick's Law and the electrode processes of the films were controlled by diffusion. The curing behavior of GEFDC/ dicyandiamide system was investigated by nonisothermal measurement according to Ozawa's approach. The ferrocene-based epoxy resins have promising applications in the fields such as burn-rate catalyst for composite solid propellants and electrode modification.A novel polymer of Poly(diglycidyl maleate-co-stearyl methacrylate) [P(DGMA-co-SMA)] was synthesized and its structure was characterized by ¹H NMR. Its self-assembly behavior was studied in different solvents. It was found that vesicles and tubule-liked aggregates can be obtained through self-assembly of P(DGMA-co-SMA)/THF/EtOH system. And spheral aggregates were obtained in P(DGMA-co-SMA)/THF/H₂O system while the spheral aggregates were converted into rod-liked aggregates and line-liked aggregates after aged for different time. The mechanism of the self-assembly behavior was discussed.A dendritic ferrocene derivative (4-Fc) was synthesized and its structure was characterized by ¹H NMR and FT-IR. Its electrochemical behaviors ware investigated by CV measurement. The recognition of H₂PO₄^- by 4-Fc was investigated by CV and UV measurements. The mechanism of the ion recognition was discussed.