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Information Seminar Paper

Title

EFFECTS OF SEBS ON MORPHOLOGY AND FRACTURE MICROMECHANISMS OF PP/PC/SEBS TERNARY BLENDS

Writers

AZIZI A. | AREFAZAR A.

Pages

 Start Page | End Page

Abstract

 TERNARY BLENDS OF PP/PC/SEBS WITH DIFFERENT SEBS CONTENTS WERE PRODUCED VIA MELT BLENDING IN A CO-ROTATING TWIN-SCREW EXTRUDER. THE PHASE MORPHOLOGY OF THE RESULTING BLENDS AND ITS RELATIONSHIP WITH IMPACT BEHAVIORS WERE STUDIED. TRANSMISSION OPTICAL MICROSCOPY (TOM) OF CRACK TIP DAMAGE ZONE AND SCANNING ELECTRON MICROSCOPY (SEM) OF IMPACT FRACTURED SURFACES WERE PERFORMED TO CHARACTERIZE THE FRACTURE MECHANISM. WITH INCREASING THE SEBS CONTENT IN PP/PC/SEBS TERNARY BLENDS, THE NUMBER OF CORE-SHELL PARTICLES INCREASED AND THE SIZE OF CORE-SHELL PARTICLES ENLARGED. PRELIMINARY ANALYSIS OF MICROMECHANICAL DEFORMATION SUGGESTED THAT THE HIGH IMPACT TOUGHNESS OBSERVED FOR SAMPLES CONTAINING 20 AND 30 WT% OF SEBS, WAS ATTRIBUTED TO THE CAVITATION OF RUBBERY SHELL AND CONSEQUENTLY SHEAR YIELDING OF THE MATRIX. THIS PLASTIC DEFORMATION ABSORBED A TREMENDOUS AMOUNT OF ENERGY.

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