ISSN: 1999-8716

Keywords : Thermal conductivity


MECHANICAL AND PHYSICAL PROPERTIES OF HIGH DENSITY POLYETHYLENE FILLED WITH CARBON BLACK AND TITANIUM DIOXIDE

Zanaib.Y.Shnean

DIYALA JOURNAL OF ENGINEERING SCIENCES, 2012, Volume 5, Issue 1, Pages 147-159

ABSTRACT:- In this work composite material composed of high density polyethylene and inorganic pigment (carbon black and titanium dioxide) was prepared. Different amounts of carbon black and titanium dioxide (2– 15) wt% were added as filler. The preparation of filled and unfilled (High density polyethylene /Carbon black and titanium dioxide) composite was carried out using a single – screw extruder operated at a temperature of (170 – 190)oC.The incorporation was performed in a single screw extruder and sheets specimens were obtained by hot compression from extruded materials. Many mechanical and physical tests were used to determine the properties of the prepared composite material which involved compression strength, impact strength and modulus of elasticity for all the preparation composite. An untreated HDPE sheet is used for the purpose of comparison. In this study, the influence of addition of Carbon black and titanium dioxide, on the mechanical ,electrical and thermal a properties test of high-density polyethylene (HDPE). The results show that the use of pigments, carbon black and TiO2 in appropriate concentration ratios give a reliable improvement in the mechanical properties. The weight fraction of the carbon blacks and titanium dioxide ranged from 0.0 up to 15 wt % with the high density polyethylene. By discharging a high voltage through the composite it was found that the resistivity of the composite decreased. Carbon black and titanium dioxide –highdensity polyethylene composites show significant differences from the neat high-density
polyethylene measured in the frequency range. It was found that the carbon black and titanium dioxide/ high-density polyethylene
composites have better thermal properties than the neat high-density polyethylene.
Keyword: high density polyethylene. Titanium dioxide, Carbon black, Electrical properties, Thermal conductivity, Mechanical properties

THERMAL INSULATION OF BUILDING MATERIALS

JALEEL IBRAHIM KADURY

DIYALA JOURNAL OF ENGINEERING SCIENCES, 2010, Volume 3, Issue 1, Pages 28-44

Iraq is belong one of three areas in the world, with the highest temperature in summer.But normal wall and roof constructions in Iraq are often without any thermal insulations.The aim of this paper is to calculate the thermal resistance and thermal transmittance of usual Iraqi wall construction. This calculations depends on the thermal conductivity ( λ ) of different materials .Those calculations were compared with insulated wall construction values.
As insulation material is a layer of expanded polystyrene (EPS) or extruded polystyrene (XPS) used in the calculations. The adding of this layer reduce the U-value for the construction to 0.431 W/m 2 .c 0
The result shows, That a wall construction consist of concrete hollow block-2chamber with 20mm external and 15mm internal plaster having U-value of 2.39 W/m 2 .c 0 .
This value is faraway from the U-value of ≤0.5 W/m 2 .c 0 as standard value by countries with extremely hot summer.