A novet toughened epoxy resin was obtained by using a precopotymer of epoxy resin and hydroxy-terminated butadiene-acrylonitrile copolymer(HTBN)and amine curing agent.The cured toughened resin has excellent mechanical...A novet toughened epoxy resin was obtained by using a precopotymer of epoxy resin and hydroxy-terminated butadiene-acrylonitrile copolymer(HTBN)and amine curing agent.The cured toughened resin has excellent mechanical properties due to the two-phase structure,which has been observed from SEM and TEM.展开更多
The phase separation mechanism,and structure development during curing of epoxy with a novel liquid rubber-ZR were investigated by time-resolved light scattering,optical microscope and differential scanning calonmetry...The phase separation mechanism,and structure development during curing of epoxy with a novel liquid rubber-ZR were investigated by time-resolved light scattering,optical microscope and differential scanning calonmetry (DSC) The mixture loaded with curing agent was a single-phase system in the early stage of curing.When the cure reaction proceeded,phase separation took place via the spinodal decomposition induced by polymerization of epoxy resin.This was supported by the characteristic change of light scattering profile with curing time.Cure reaction plays an important role in the progress of phase separation.The bigger the cure reaction rate is,the longer periodic distance will be.The overall two-phase structure was basically locked in when the conversion approached 80% estimated by DSC,and finally the co-continuous two-phase structure was successfully obtained.展开更多
文摘A novet toughened epoxy resin was obtained by using a precopotymer of epoxy resin and hydroxy-terminated butadiene-acrylonitrile copolymer(HTBN)and amine curing agent.The cured toughened resin has excellent mechanical properties due to the two-phase structure,which has been observed from SEM and TEM.
基金supported by the National Key Basic Research Projecr-Macromorecuiar Condensea Statethe National Natural Science Foundation of Chinathe Development Foundation of Science & Technology of Shanghai
文摘The phase separation mechanism,and structure development during curing of epoxy with a novel liquid rubber-ZR were investigated by time-resolved light scattering,optical microscope and differential scanning calonmetry (DSC) The mixture loaded with curing agent was a single-phase system in the early stage of curing.When the cure reaction proceeded,phase separation took place via the spinodal decomposition induced by polymerization of epoxy resin.This was supported by the characteristic change of light scattering profile with curing time.Cure reaction plays an important role in the progress of phase separation.The bigger the cure reaction rate is,the longer periodic distance will be.The overall two-phase structure was basically locked in when the conversion approached 80% estimated by DSC,and finally the co-continuous two-phase structure was successfully obtained.
