Print ISSN: 1681-6900

Online ISSN: 2412-0758

Keywords : Filler

Studying the Effect of Addition of Carbon Black on Rheological Properties of Polypropylene and Polycarbonate

Najat J. Salah; Abbas A. Jawad

Engineering and Technology Journal, 2013, Volume 31, Issue 5, Pages 976-991

In the present research the rheological properties of polymer melt composed of (polypropylene- polycarbonate ) unfilled_ filled with different amounts of Iraqi carbon black (2 – 7) wt% was studied. Single screw extruder was used for development of these blends . The rheological behaviour of these blends was investigated by using rotational concentric type rheometer .
The rheological properties shear rate( ( , apparent viscosity (a), dynamic viscosity(ή ), shear stress (τ) and angular frequency (ω),shearing flow at various temperatures ( 220 ˚C, 240˚C and 260 ˚C) were studied and found to be increase with increasing the amount of filler and decrease with increasing temperature. The flow curves were determined in the range of shear rate from about (10 to10 2 ) s-1. The activation energy was also measured, the values of activation energy varied from(11.939 to 20.892) KJ/Mole for different formation.

A Study of Some Mechanical, Thermal and Physical Properties of Polymer Blend with Iraqi Kaolin Filler

Najat J. Saleh; Samir Nassaf Mustafa

Engineering and Technology Journal, 2011, Volume 29, Issue 11, Pages 2114-2131

In the present work, polymer blends were fabricated by mixing two polymers
of polypropylene and poly (methyl methacrylate) mixed in different weight
percentage and different particle size of Iraqi kaolin. The study of some
mechanical, physical and thermal conductivity properties was carried out on all
composites. The mechanical tests included (impact, hardness, modulus of
elasticity, yield strength, elongation, stress at break and compression), Lee's disc
method was used to calculate the coefficient of the thermal conductivity of
specimens before and after reinforcement with kaolin powder. The physical
properties test included absorption tests, as well as X-ray measurement. The
results have shown that after the reinforcement with different weight percent of
kaolin powder, most mechanical properties such as hardness , modulus of
elasticity and compression increase while impact and elongation decrease with
increasing in weight percentage and a decreasing in particle size. The results have
shown also that the coefficient of thermal conductivity decreases with increase
weight percentage the water gain is decreased with the increase in weight percent
and decrease in particle size of the filler. X-ray diffraction pattern of filled
samples indicates that addition of kaolin adversely affects the crystallization of
PP/PMMA blend.