الفهرس 
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Abstract
Polymers are widely used as a flooring material in detention centers, hospitals, factories and washrooms. Thus because they have many advantages
such as low manufacturing cost, low shrinkage, high chemical corrosion
resistance, low creep, high stiffness and good mechanical properties. In the
present work, the main objective is to investigate the effect of hardness and
thickness on the friction coefficient and electric static charge generated from the contact and separation as well as sliding of the rubber sole against the tested polymeric materials.
Based on the experimental observations, it was found that friction coefficient
displayed by sliding of rubber sole against the dry flooring materials,
drastically decreased with increasing the hardness of the tested flooring,
while increased with increasing normal load. At water and detergent wetted
as well as oil lubricated sliding, soft tested rubber showed higher friction
coefficient than the harder one. Besides, dry sliding showed significant
increase of friction coefficient with increasing material thickness. In the
presence of detergent and oil between the sliding surfaces, friction coefficient drastically decreased to values lower than that displayed by water. Presence of sand particles on the flooring increased friction coefficient as the thickness
and the load increased.
Electric static charge generated by dry sliding decreased with increasing the
hardness. Water, detergent and oil lubricated sliding showed relatively lower voltage than that observed for dry sliding. At lubricated sliding, voltage showed drastic decrease with increasing hardness. In the presence of sand,voltage decreased with increasing hardness. Finally, voltage significantly
increased with increasing the thickness for all sliding conditions. Water
wetted sliding showed lower values than that observed for dry sliding, while
detergent sliding showed relatively higher values than that observed for water wetted sliding. Oil lubricated and sand contaminated sliding showed the
lowest values.