2017 Volume 53 Issue 8 Pages 262-267
The authors investigated physical properties of epoxy resins modified by various blend ratio of PUR（Polyurethane Resin） and PUE（ Polyurethane Elastomer）. PUR and PUE were synthesized in epoxy by usingthe same method in the previous paper, respectively. PUE was made from poly（ oxytetramethylene） glycol（PTMG;MW:2000）, 4,4＇-diphenylmethanediisocyanate（ MDI） and 1,4-butanediol（ BD）, and PUR made fromPTMG1000 had many amounts of hard segment which was composed of MDI and BD in chemical structure ofpolyurethane.The results of SEM showed that the diameter of PU particle dispersed in epoxy resins modified by PUE wasbigger than one of PUR system, and PUE system changed into co-continuous structure with increasing in theamount of PUE. The morphology of all epoxy resins modified by PUR and PUE blends showed micro phaseseparation structures of the sea and island type, the PU particle sizes of them became much finer diameterthan PUE system.Regarding physical properties in all aspects, T-peel strength of 3 blends system increased at 20～30phramount ,especially the strength at blend ratio 1/1 of PUR/PUE showed drastic increase. Tensile shearstrength, bending properties and fracture toughness were kept relative high value without deterioration at thehigh amount region. Furthermore, these physical properties except T-peel strength indicated the remarkableresemblance behavior per amount of the blends without dependence on the blend ratio.
