High Density Polyethylene (HDPE) and Polypropylene (PP) Polyblend: An Experimental Approach | Chapter 04 | New Advances in Materials Science and Engineering Vol. 1

The present research focuses to evaluate a complete outlook of virgin high density polyethylene (HDPE) and polypropylene (PP) polyblends. Virgin PP of 10, 20, 30, 40 and 50 weight % is compounded with virgin HDPE. Tensile, Flexural and impact test specimens of virgin HDPE, Virgin PP and HDPE-PP composites are prepared via twin screw extruder and injection moulding methods as per ASTM D638-02a (Type-I), ASTM D790 and ASTM D256-A standards respectively. The mechanical properties like tensile strength, flexural strength, Izod impact strength are examined. Polymer sheets are fabricated using a two roll milling machine and compression moulding; and its electrical properties like dielectric strength, surface resistivity, volume resistivity are examined according to ASTM-D 257 standard. The study also includes effect of strain rate on tensile properties of the prepared composite at a cross head speed of 30, 40, 50, 60 and 70 mm/min. Design of experiment is conducted to find parameters dominating the tensile strength. All experiments are carried out at room temperature of 23°C and absolute humidity of 54%. Scanning electron microscopy (SEM), Atomic force microscopy (AFM) and polarised light microscopy (PLM) are used to observe the surface and crystal morphology. X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR) tests verify the non compatibility of both polymers. Differential scanning calorimetry (DSC) and thermogravimetric analysis (TGA) techniques are used to study the thermal behaviour of composites. The results manifest dielectric strength and volume resistivity decreases with addition of PP to HDPE; whereas surface resistivity increases. Co-occurring spherulites are seen for polyblends; indicating the composite to be a physical blend of continuous and dispersed phases, but on the other hand PP improves the tensile and flexural properties of HDPE.

Author(s) Details

Harekrushna Sutar
Department of Chemical Engineering, Indira Gandhi Institute of Technology, Sarang, India.

Rabiranjan Murmu
Department of Chemical Engineering, Indira Gandhi Institute of Technology, Sarang, India.

Chiranjit Dutta
Department of Chemical Engineering, Indira Gandhi Institute of Technology, Sarang, India.

Mutlu Ozcan
Head of Division of Dental Biomaterials Center for Dental and Oral Medicine Clinic for Fixed and Removable Prosthodontics and Dental Materials Science, University of Zurich, Swizerland.

Subash Chandra Mishra
Department of Metallurgical and Materials Engineering, National Institute of Technology, Rourkela, India.

Read full article: http://bp.bookpi.org/index.php/bpi/catalog/view/66/781/604-1
View Volume: https://doi.org/10.9734/bpi/namse/v1

Advertisement

Effect of Concentration on Morphological, Optical and Electrical Properties of Copper Doped Zinc Oxide Thin Films Deposited by Electrostatic Spray Pyrolysis (ESP) Technique | Chapter 03 | New Advances in Materials Science and Engineering Vol. 1

Pure zinc oxide (ZnO) and copper (Cu) doped ZnO thin films were synthesised from the precursor’s concentrations (zinc acetate and copper acetate) onto glass substrate via electrostatic spray pyrolysis (ESP) deposition technique at 350°C in air ambient with different Cu doping concentrations (0%, 5%, 10%, 15% and 20%). The thin films were analysed with regards to its morphological, optical, and electrical properties before and after annealing. The results indicate that the annealing of the thin films leads to improved surface morphology and better crystallinity quality. Nanofibers were observed around the nucleation centre in the pure ZnO thin films. The absorbance was recorded in the wavelength range of 230 nm to 1100 nm, and the optical transmission of the films was found to increase for increasing doping concentration of Cu up to 370 nm and then decreased for higher wavelengths. ZnO:Cu films displayed high optical transparency which is around 86% – 98% in the visible and infrared regions but minimum in the ultraviolet region. The band gap energy value of the pure ZnO films was found to be 3.20 eV, whereas the doped films revealed a continuous decreases for higher doping of Cu concentration, reaching a value of 2.66 eV. The refractive index of the films significantly changes with the deposition parameter and increases sharply from 1.4597 to 1.7865 and the highest electrical resistivity was found to be 8.83 μm, and the lowest optical conductivity of 0.113 MƱm-1 was observed in the films with 20% Cu doped film, which indicates that the deposited films are highly suitable for photovoltaic cells and other optoelectronic device applications.

Author(s) Details

D. O. Samson
Department of Physics, University of Abuja, P.M.B 117, Abuja, Nigeria and School of Physics, Universiti Sains Malaysia, 11800 USM, Gelugor, Penang, Malaysia.

Read full article: http://bp.bookpi.org/index.php/bpi/catalog/view/66/780/603-1
View Volume: https://doi.org/10.9734/bpi/namse/v1