THE STUDY ON THE PROPERTIES OF EPOXY RESIN TOUGHED BY CHAIN-EXTENDED UREAS CONTAINING FLEXIBLE SPACERS THE STUDY ON THE PROPERTIES OF THE EPOXY RESIN/CHAIN- EXTEND EDUREAS/DICYANDIAMIDE SYSTEM
ZHANG Baolong, ZHANG Huiqi, DING Peiyuan, YOU Yingcai, DU Zongjie, ZHOU Xingdi, WANG Tao, HUANG Jifu. THE STUDY ON THE PROPERTIES OF EPOXY RESIN TOUGHED BY CHAIN-EXTENDED UREAS CONTAINING FLEXIBLE SPACERS THE STUDY ON THE PROPERTIES OF THE EPOXY RESIN/CHAIN- EXTEND EDUREAS/DICYANDIAMIDE SYSTEM[J]. Acta Polymerica Sinica, 1996,(6):697-704.
ZHANG Baolong, ZHANG Huiqi, DING Peiyuan, YOU Yingcai, DU Zongjie, ZHOU Xingdi, WANG Tao, HUANG Jifu. THE STUDY ON THE PROPERTIES OF EPOXY RESIN TOUGHED BY CHAIN-EXTENDED UREAS CONTAINING FLEXIBLE SPACERS THE STUDY ON THE PROPERTIES OF THE EPOXY RESIN/CHAIN- EXTEND EDUREAS/DICYANDIAMIDE SYSTEM[J]. Acta Polymerica Sinica, 1996,(6):697-704.DOI:
A series of chain-extended ureas containing polyethylene glycol (PEG) spacers with different molecular weight were synthesized and the reactive activity
impact strength
the dynamic mechanical behavior
the morphology and the storage property of the epoxy resin/Ui/dicyandiamide system were studied.Experimental results revealed that the impact strength of the epoxy resin/chain-extended urea containing PEG flexible spacer with molecular weight 400/dicyandiamide system was seven times higher than that of the epoxy resin/dicyandiamide system
and the SEM micrographs of the impact fractured surface showed the tough fracture characters.Re-sults also showed that the molecular weight of PEG flexible spacers in chain-extended ureas basically and no influence on the reactive activity of the ureas.The storage life of epoxy resin/Ui/dicyandiamide systems at 50℃ was one to two days.