Print ISSN: 1681-6900

Online ISSN: 2412-0758

Keywords : PVC


Thermo-Chemical Behavior of Epoxy Composite (EP/PVC) Reinforced by Addition of Scrap Tires

Raghad U.Abass

Engineering and Technology Journal, 2016, Volume 34, Issue 6, Pages 769-776

The high performance and unique utilization properties applied by designers according to improvement of thermal and mechanical products were reinforced by particulate materials. The present study deals with the preparation of a composite system (EP/PVC). afterward the estimation of thermo-chemical behaviour of epoxy composite (EP/PVC) reinforced by addition of micro-fillers particulate of waste scrap tires (WST). Three different sets of epoxy-PVC composites are fabricated with addition of 0, 0.25, and 0.4 wt% of WST particulates. These composites have been prepared and both chemical reactivity absorbance and thermal conductivities are achieved. From results it appeared that a decreasing in thermal conductivity values about 55 % for 0.25wt % for a micro-WST of epoxy composite system, of 0.4wt. %recorded decreasing of thermal conductivity at88 %when compared to epoxy composite system (EP/PVC). The results show that the (WST) micro-fillers particles show an insulation polar behaviour at 0.4 wt. % at which a random behaviour in thermal conductivity is recorded .In addition to an experimental examination of chemical activity absorbance for both composite system before and after additive of micro-filler particulate of waste scrap tires (WST) in different soaking medium (normal and acidic solutions) and different residence times (0-120 hrs) respectively. The results proved that an improvement chemical activity occurred for optimum sample no. 3 of (2.5/ .4 + .4 (EP/PVC + WST) that have minimum loss in weight as (0.001) under both soaking medium (100% H2O, 10% H2SO4) rather than base composite system (EP/PVC) and other improved one of .25 wt. % from WST of (0.01 – 0.05) respectively.

Comparison OF Shear Properties for High Density Polyethylene (HDPE) and Poly vinyl Cloride (PVC) Polymers

Shawnim R. Jalal; Delven kareem

Engineering and Technology Journal, 2015, Volume 33, Issue 9, Pages 2039-2048

The properties that make plastic of direct interest to designers and engineers are its good strength to weight ratio, low manufacturing installation costs, and high durability. The strength of polymers is known to be sensitive to temperature and this generally limits their use under service temperatures. The present work addresses the effect of temperatures ranging from 0 to 70 on the shear properties of high-density polyethylene (HDPE) and polyvinyl chloride (PVC) materials. The results show that Yield stress increase with temperature by (15.4%) for HDPE and the temperature has no effect on yield stresses of PVC.
The modulus of elasticity varied in each temperature for both materials selected and the maximum shear strength, however, showed a slight increase in this temperature range by (1.4%) for HDPE but slightly decrease by (2%) for PVC. Shear rupture and elongation reduced by (0.02%) with increasing temperature by (1 °C) for both materials .Ductile fracture is observed to be the controlling failure mechanism at all temperatures of interest for both material and no data were recorded at 70 due to distortion of all specimens in this temperature selected.

Comparative Study of Some Properties of Two Groups’ Binary Polymer Blends Prepared By a Twin-Screw Extruder

Sihama I. Al-Shalchy; Kadhum M. Shabeeb; Rula F. Hasan

Engineering and Technology Journal, 2015, Volume 33, Issue 8, Pages 1971-1985

In this paper, the preparation and compare of some mechanical and physical properties of two groups of polymer blends consisting of polyvinyl chloride with polypropylene (PP-PVC) and poly-vinyl chloride with high-density polyethylene (HDPE-PVC). Using a twin-screw extruder, three weight percentages of PP and HDPE (5, 10 and 15%) were used to prepare the polymer blends. Experimental investigation was carried out for analyzing the mechanical properties liketensile strength, flexural strength, compression, impact, and hardnessand physical properties (thermal characteristics and melt flow index) for the polymer blend samples. The results show that the polymer blend (HDPE-PVC) get higher values than polymer blend (PP-PVC) in fracture strength, young´s modulus, elongation, flexural strength, creep resistantand maximum shear stress and thermal characteristics, whereas the polymer blends (PP-PVC) get higher values in impact strength, fracture toughness, hardnessand compression and melt flow index. Besides, the increment in PP or HDPE content weak the properties of the polymer blends and the samples with (5%PP:95%PVC) and (5%HDPE:95%PVC)were the best among the other polymer blends samples.

The Influence of Operation Conditions on the Permeative Flux of (PVC/PS) Hollow Fiber Membrane

Qusy F.Alsalhy; Jamal M.Ali; Khitam S.Shaker

Engineering and Technology Journal, 2012, Volume 30, Issue 16, Pages 2767-2777

Membranes have gained an important place in chemical technology and are used
in a wide range of applications. This investigation has studied the effect of operating
conditions such as temperature, trans-membrane pressure and solute concentration
on the separation performance of (PVC/ PS) hollow fiber membrane, which was
prepared in the laboratory from 15% (PVC) and 2% (PS) using phase inversion
method. An attempt was done to investigate the ability of PVC/PS hollow fiber
membrane for ultrafiltration application. A (PVP) solute was used to measure (PVP)
rejection of prepared membrane.
The predicted flux was found to increase from (18.88 l/m2.hr) to 33.05 l/m2.hr)
when the operation temperature was increased from (10Ž) to (30Ž).While it
increased from (28.57 l/m2.hr) to (263.36 l/m2.hr) when the operation pressure was
increased from (1bar) to (3bar). It was also found to decrease from(17.97 l/m2.hr) to
(12.20 l/m2.hr) with increase solute concentration from (1000ppm) to (2500ppm).
The rejection efficiency was equal to (99.93%) when using (2500ppm) solute. This
is considered within UF range.

Optimizing the Conditions for the PVC Playing- Balls Fabrication

Suhair Mohammad Yaseen; Ali Najem Abdullah

Engineering and Technology Journal, 2011, Volume 29, Issue 11, Pages 2274-2281

Although PVC polymer is one of the cheapest plastics that are widely used in industry. The conditions of PVC processing industries are still industrially and commercially confidential and uncovering it is still industrially and commercially confidential and uncovering it is not easy. This work aims to make processing conditions available to whom interest. This has been achieved by studying the parameters associated with production process and determine the optimum conditions which are necessary to get best quality and more economical product. These parameters are included:
1- Mixing equal quantities of both rigid and flexible PVC will give
requiredhardness for product with degree of polymerization 600-700.
2- Addition of 3% stabilizer (tribasic lead sulfate) works on raising temp. Of process to 250 centigrade without polymer burning or dissociation.
3- Addition of 55% plasticizer (dioctyl phthalate) to polymer (melting point of polymer Tm = 90-100 centigrade and glass transition temp. Tg = 170 Co) decreases Tg below room temp. 20-25Co .As a result of this work, product has enough strength and good flexibility to charge with required volume of air.
4- Coloring of product by 2% Titanium oxide to give bright white color.
Oven temp. Is 150-180 Co.

Some Factors Effecting on the Dielectric Strength for (PVC- Kaolin) Composites

Engineering and Technology Journal, 2011, Volume 29, Issue 3, Pages 103-116

This research includes the effect of kaolin additions to the polymer matrix (PVC)
and study some factors affecting to dielectric strength.
The kaolin powder was added as percentage by weight (1,2,3 and 4%) to PVC,
and the specimens formed by hot pressing method, with different thickness (0.8-2
mm). Some of the results was showed decrease in the electrical strength with kaolin
additives, especially for large thickness due to presence of lattice water, which has
high dielectric constant but in the same time has high dielectric loss factor, where the
electrical strength decrease when dielectric loss factor increases. Thus the influence of
leakage currents is evident in the large thickness as a result of the electro-thermal
effects.
Electrical strength was decreased when the time rate of raising voltage increases.
The effect of the cycles number of breakdown for composite specimens was studded.
Also the dielectric strength decreased with temperature increases.
Optical microscopy images for breakdown region was shown the
carbonization in the breakdown points as a result of crashing polymers chains.
Also, micro cracks occurring for specimens that has large amount of kaolin and
this cracks extend directly from the breakdown region.