Effects of SEBS-g-MA on Rheology,Morphology and MechanicalPropertiesof PET/HDPE Blends
Effects of SEBS-g-MA on Rheology,Morphology and MechanicalPropertiesof PET/HDPE Blends
- International Polymer Processing , 30(1), p.91-99, 2015 .
The effects of additivestyrene/ethylene-butylene/styrene copolymergrafted withmaleicanhydride (SEBS-g-MA)were investigated on the rheology,morphologyand mechanical propertiesof apolyethylene terephthalate(PET)/high density polyethylene (HDPE)blend. The ratio of the twocomponents waschanged in small increments totrackphaseinversion. The rheologymeasurements showthatSEBS-g-MA acts differentlyon HDPE and PET, asdifferentmorphologiesare formed duetoviscosity ratio change. Withthe help of electron microscopyvarious phasesafterextrusion and afterinjection moulding wererevealed and identified. Becauseofthe high viscosity of HDPE the co-continuous morphologywasimmediatelyformed when PET reached 30 vol percent. The range of the co-continuous structureofthe blend waswiderwhen SEBSg-MA wasadded,and the elongation tbreakalsoimproved asadditivecontentincreased,without asignificantstrength decrease. The divergenceofthe mechanicalpropertiesfrom the theoreticalvalue,i. e. the valuedetermined bythe mixing rule,canbeexplained bythe changing phasestructure.
The effects of additivestyrene/ethylene-butylene/styrene copolymergrafted withmaleicanhydride (SEBS-g-MA)were investigated on the rheology,morphologyand mechanical propertiesof apolyethylene terephthalate(PET)/high density polyethylene (HDPE)blend. The ratio of the twocomponents waschanged in small increments totrackphaseinversion. The rheologymeasurements showthatSEBS-g-MA acts differentlyon HDPE and PET, asdifferentmorphologiesare formed duetoviscosity ratio change. Withthe help of electron microscopyvarious phasesafterextrusion and afterinjection moulding wererevealed and identified. Becauseofthe high viscosity of HDPE the co-continuous morphologywasimmediatelyformed when PET reached 30 vol percent. The range of the co-continuous structureofthe blend waswiderwhen SEBSg-MA wasadded,and the elongation tbreakalsoimproved asadditivecontentincreased,without asignificantstrength decrease. The divergenceofthe mechanicalpropertiesfrom the theoreticalvalue,i. e. the valuedetermined bythe mixing rule,canbeexplained bythe changing phasestructure.