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Title: Laboratory Investigation on the Development of Novel
Authors: Ali Al-Haddad 
Supervisor: Dr. Khaled Al-Fadhel
Keywords: PTT, PBT , ABS Blends , Single Screw Extruder
Issue Date: 2016
Publisher:  Kuwait university - college of graduate studies
Abstract: Blending of immiscible polymers like PTT, PBT, and ABS helps in the development of advanced polymeric substances of beneficial chemical and physical characteristics. It is observed that these polymers acquire inferior mechanical properties due to their chemical nature. Therefore, a preformed graft copolymer was used to act as a compatibilizing agent. The novelty of this work is the synthesis of di and tri component compatibilized systems containing different polyesters such as PTT and PBT, and an amorphous polymer such as ABS. ABS is considered best in the styrenic family and is used in the present work to impart its toughness, hardness, rigidity and dimensionally stable properties to the selected polyesters. The goal of the present study will be to investigate the addition of commercially used compatibilizers like MAH and ABS-g-MAH to a di and tri component polyester/elastomer system respectively and to check the improvement in the thermal, mechanical and rheological properties. Polymers were extruded using a single-screw extruder and then pelletized. A two pass run was carried out for each experiment to confirm homogeneity in the blends. DSC analysis was carried out to characterize the thermal transitions of the blends. Appearance of two different peaks at temperatures lower than the melting temperature (Tm) of PTT and PBT with low melting enthalpy (ΔHm) values indicated that the blends were partially miscible when compatibilized with ABS-g-MAH. Dynamic rheological analysis was used to determine shear viscosity, complex viscosity, and modulus. Rheological analysis clearly indicates that compatibilized di-component blends exhibit higher visco-elastic properties like viscosity, storage and loss modulus compared to compatibilized tri-component blends. The reason for this is the occurrence of a greater disorder when a tri-component system is poorly mixed using a single screw extruder. Also, the presence of ABS acts in decreasing rheological properties of di-component polyester systems when it is poorly mixed using a single screw extruder. The mechanical property of di and tri component melts was estimated which revealed that di-component blends had high tensile modulus and strength compared to tricomponent blends. This is due to the poor interfacial interaction between PTT, PBT and ABS polymers. From the rheological and mechanical analysis it was observed that presence of compatibilizer like ABS-g- MAH increases rheological and mechanical properties of the di and tri component blends compared to that of the uncompatibilized system.
Appears in Programs:0640 Chemical Engineering

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