Study On Processing Performance Of Poly(Phthalazinone Aryl Ether)S And The Blends With TLCP

Poly(phthalazinone aryl ether)s, one kind of super engineering plastics, possess excellent comprehensive performance. However, they are not easy to be thermally processed due to their high melting viscosity. Besides, higher thermal resistance and more brilliant performance materials are needed to adapt to development of new technology. In this article, poly(phthalazinone aryl ether)s were blended with thermotropic liquid crystal polymer (TLCP) aimed to improve the processing performance and maintain their prominent performance.At first, the rheological properties of poly(phthalazinone aryl ether)s were conducted by HAAKE torque rheological test. Rheological characteristics of PPESK and PPBES were summed up that the resin with a low balance of torque and a wide stable balance area can be processed by extrusion molding. And then two commercial TLCPs (TLCP-1, TLCP-2respectively called) and/or nano-SiO2were blended with them to conduct HAAKE torque rheological test to explore their properties, the results show that the right amount of the TLCP were introduced to reduce the magnitude of the balance torque, while in most cases the fillers introduced increased the balance torque of the blends of poly(phthalazinone aryl ether)s and TLCP, which is not conducive to the thermoforming process.According to the HAAKE torque rheological test above, PPBES was chose to blend with the commercial TLCPs to explore their mechanical properties, thermal properties and morphology. PPBES/TLCP blends were prepared by two screw extruder. The results of current of extruder demonstrate that the melting viscosity of the blends decreased with the increasing amount of TLCP, which meant the improvement of processing performance. Besides, according to the TGA and DTG curve, adding small amount of TLCP, the5%loss temperature of blends did not change drastically, all of that above490℃. Miscibility of blends was investigated via DSC and SEM, the results show that PPBES/TLCP blends were immiscible in a certain percentage of TLCPs. The blends morphology were observed by SEM. It showed typical core-skin structure existed in the blends, the TLCP dispersed phase in corresponding samples had its morphology from spherical, through ellipsoidal and elongated, to fibrillar with the increasing amount of TLCP. Mechanical property of the blends increased with small amount of TLCP while dropped with a higher content of TLCP, which may due to weak interface strength and macroscopic phase separation.