Preparation, characterization, and properties of organic silicone intermediate-modified epoxy resin copolymers

Abstract

In this work, a series of silicone-containing epoxy copolymers (E231) were synthesized through a condensation reaction between the Si-OCH3 of SY231 and the –OH of E51. The chemical structural determinations of the copolymer were carried out with the Fourier transform infrared spectroscopy, nuclear magnetic resonance (NMR), and an epoxy equivalent weight test. Besides, the grafting content of SY231 in E231 copolymers was determined by the proton (1H) NMR integration technique. The mechanical properties, thermal stabilities, and morphology of impact fractured surface of cured products were also investigated. The experimental results show that increased impact strength was observed for the cured E231 products, meanwhile the improvement of the impact strength was closely related to the content of silicone in copolymers. A smooth surface was observed on the neat epoxy specimen, while a rough surface was observed by scanning electron microscopic examination on the impact fractured surface of the cured E231 products. The data of TGA indicated that silicone exerted its thermal stability through thermal decomposition energy dissipation, acted as thermal insulation, and finally enhanced the solid residue at 800°C. Dynamic thermomechanical analysis tests displayed that the glass transition temperature of epoxy systems decreased slightly with the introduction of the flexible organosilicone.

The thermal stability investigation of microencapsulated ammonium polyphosphate/siloxane‐modified epoxy resin composites

“…Representative fractured surfaces of pure E51 and EA‐S systems are displayed in Figure . Figure (a) represents relatively polished and flat fractured surface, indicating that a typical brittle fracture manner of pure E51 has occurred, which has been reported in our previous work . Figure (b), shows irregular and rough with curling feature propagation surface, demonstrating that the impact property is improved by introducing MFAPP component into epoxy matrix, which coincides with the results of impact testing.…”

Preparation of high‐performance epoxy‐containing silicone rubber via hydrosilylation reaction

“…Some polymers such as poly(methyl methacrylate), PMAA (which was prepared from methacrylic acid, triethylene glycol dimethacrylate, and 2,2‐dimethoxyacetophenon), polyurethane were used to modify PDMS, but the problem is that the thermal stability of these materials will either decrease dramatically or not be fully studied. Epoxy resin is one of the most promising materials used in the industrial fields thanks to its superior mechanical and adhesive properties . Theoretically, the addition of epoxy resin can greatly improve the mechanical and adhesive properties of silicone rubber.…”

Epoxy terminated polysiloxane blended with diglycidyl ether of bisphenol‐A. 1: Curing behavior and compatibility

“…It can offer the benefits of both silicone resins and epoxy resins as siloxane in the copolymeric form chemically bonds to the epoxy resin. There were kinds of epoxy functional siloxanes studied, such as siloxane in backbone (epoxy terminated or grafted, siloxane grafted, at the presence of curing agent amine or anhydride or other…”