Preparation and improvement of Thermal Expansion Coefficient and Impact Strength of (PMMA\CaAl2O4) system

Abstract

Abstract In this research, a biocompatible polymer system was developed with the body of the organism supported by a two-phase ceramic powder consisting of a mixture of calcium oxides and alumina powder. Samples were obtained using a fluid mixing method and using ultrasound technology to distribute the powder and spread it within the polymer (PMMA). The weight fraction used for reinforcement was (0%, 1%, 2%, 3% and 4%). The thermodynamic analysis technique (TMA) was used to complete and test the thermal expansion coefficient for a certain temperature range between 20-250 ° C where the results showed a significant improvement in thermal expansion coefficient at temperatures below 100 ° C for prepared composites at 3%wt. compared with that of the unsupported polymer showed a significant expansion at the same temperature range. Impact strength have measured by using Charpy test for all samples with a standard dimension of 5.5cm × 1cm×1cm. The pendulum angle was stabilized at 150 °, where all the prepared composite showed high impact strength, hardness and fracture toughness, respectively, compared with the polymer material. The tested powder was tested using x-ray diffraction as well as the scanning electron microscopy and x-ray dispersion spectrometry to determine the ratios and interacting compounds in the preparation of biochemical powder.