NGHIÊN CỨU TÍNH CHẤT VÀ CẤU TRÚC CỦA VẬT LIỆU COMPOZIT POLYETYLEN/PE-g-AM/CaCO3

Abstract

The composites of PE/CaCO₃ with and without PE-g-AM compatibilizer were prepared by melt mixing in a Haake Rheomix 600p. The Haake torque (could be called as the relative melt viscosity) of the composites was recorded while mixing by Polylab V 4.1 software. The mechanical properties of the composites were tested by a WMP instrument, dielectric properties were measured by using a TR-10C dielectric loss measuring set and volume resistivity was measured by IV method using a TR-8401 DC instrument with applied voltage of 1000 V. The mophological structrure of the composites was studied by scanning electron microscopy (SEM). The results showed that CaCO₃ and PE-g-AM increased relative melt viscosity of the composites, this proved that PE-g-AM enhanced the adhesion between CaCO₃ and PE matrix while melt mixing them. The mechanical properties of the PE/CaCO₃ composites strongly decreased with increasing CaCO₃ contents. But by adding PE-g-AM, the mechanical properties of the PE/CaCO₃ composites were improved significantly, especially in tensile strength. PE/CaCO₃ and PE/PE-g-AM/CaCO₃ composites had good electrical insulation properties, such as high resistivity and very low dielectric loss. The PE-g-AM compatibilizer played an important role for the enhancement of dispersity of CaCO₃ in PE matrix, reducing agglomeration of CaCO₃ particles in PE matrix.