Effect of dimethylpolysiloxane liquid on the cryogenic tensile strength and thermal contraction behavior of epoxy resins

摘要: Abstract Dimethylpolysiloxane liquid was blended with diglycidyl ether of bisphenol-A epoxy resin including anhydride curing agent to improve the tensile strength at 77 K without any increase in its coefficient thermal expansion (CTE). A bifunctional polymer, silicone-modified (SME), also added mixture as a compatibilizer. The results UV transmittance for blend showed that incorporation SME could stabilize effectively spherical domains siloxane which immiscible matrix. strengths resins both room temperature and were measured SEM analysis fractured cross sections carried out verify toughening behavior droplets. indicated even small amount addition (0.05 phr) coupled (20 enhance by 77.6% compared neat resin. This improvement is attributed fact solid s droplets can disperse localized stress interrupt crack propagation cavitation mechanism followed multiple generation numerous micro-deformation. From CTE measurement, has no influence on contraction