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.
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