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Go to Editorial ManagerThis study aims to evaluate the effect of adding alumina particles at specific ratios on the thermal properties of the epoxy-alumina composite. The hand lay-up technique was employed using a gravity molding process. Six samples’ specimens with dimensions specified by the International Standard (ASTM) were prepared with the specified volume ratios of alumina (0%, 10%, 20%, 40%, 50%, and 60%). X-Ray Diffraction (XRD) was conducted, and according to the Lee's principle the thermal conductivity was measured. The results showed that increasing the concentration of the alumina filler significantly enhances the thermal conductivity of the composite, reaching approximately 1.25 W/m.K at a loading of 60%. Moreover, the differential scanning calorimetry (DSC) analysis of the DSC conducted on samples containing (0%, 40%, and 60% AI2O3) only shows that the glass transition temperature (Tg) gradually increases with the increase in alumina content, reaching 138.92°C at 60% AI2O3. These results confirm the suitability of the developed composite for efficient thermal management in advanced engineering applications.
The polyethylene terephthalate (PET) was prepared from PET flakes of empty local water drinking bottles and diagnosis by infrared spectroscopy (IR). The glass transition temperature, melting temperature T m and heat capacity were indicated by differential scanning calorimeter (DSC). Part hundred ratios (phr , s) of (PET) were added to study its effect on concrete properties. Additives of (phr) impart performance such as increased cement dispersion, enabling drastically reduced water requirements. Enhance the mortar cubes performance; depend on the compatibility of cement with PET. Porosity of mortar cubes with cement, sand and added PET products were calculated. Maximum and minimum Compressive strength were calculated 58.76 MPa, and 24.0 MPa at phr 0.04 and 0.07 of PET with cement. And PET with cement and sand were calculated 16.5 MPa and 4 MPa at dosages 0.03 gm. and 0.08 gm. The relative dosages in calculating porosity percentages are (0.06, 0.1 and 0.3) gm.
Polyethylene terephthalate (PET) was prepared from (PET) flakes and 25% of NaOH solution were added to in tri-neck flask, the reaction run for six hours at temperature (100-130) oC and the precipitate was reacted with ethylene glycol at temperature (130-160) oC. IR spectrophotometer was used for the diagnoses of (PET). Differential scanning calorimeter (DSC) is used to indicate glass transition temperature Tg, the melting temperature Tm and the heat absorbed. Part hundred ratios (phr,s) of (PET) rather than dosage of PET in gms. To concrete cubes were added to study its effect on concrete properties. Additives of (phr,s) impart performance such as increased cement dispersion, and enhance the performance of concrete which was appeared in maintaining a lengthening or slow the setting time that meets product and job needs. Maximum and minimum compressive strength is 43.7 MPa and 30.0 MPa at 0.3 gm. and 0.1 gm. respectively.