EFFECTS OF ADDITIVES ON BULK PROPERTIES OF PROCESSED PVC

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Date
1995-07
Authors
EVELYN, OKE OGODE
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Abstract
Flexible and rigid PVC compounds were formulated and blended with the aid of a laboratory Warring blender or a Banbury mixer. The formulations were then pressed into thin sheets using a hydraulic press. Tensile tests were carried out on the pressed sheets to investigate both the effect of mixing shear regime and of filler type on the tensile properties of the sheets. Solvent sorption and specific gravity measurements were also carried out to correlate the trends established by the tensile properties with changes in the molecular order of the sheets as filler concentration increased. It was observed that a high mixing shear regime enhanced the tensile properties of the sheets at the initial stages of incorporation of the fillers. The fillers namely calcium carbonate, carbon black and zinc stearate influenced the tensile properties to varying degrees. Carbon black had the most influence while calcium carbonate had the least influence. The influence of zinc stearate on the tensile properties was two-phased, with the first phase COL responding to that of carbon black and the second to that of calcium carbonate. The effect of the fillers on the tensile properties was supported by a four-stage action on the polymer matrix. This action resulted in changes in the molecular order of the sheets with increasing filler concentration.
Description
A THESIS SUBMITTED TO THE POSTGRADUATE SCHOOL, AHMADU BELLO UNIVERSITY, ZARIA IN PARTIAL FULFILLMENT OF THE REQUIREMENTS FOR THE AWARD OF THE DEGREE OF MASTERS OF SCIENCE IN POLYMER SCIENCE AND TECHNOLOGY. JULY, 1995
Keywords
EFFECTS,, ADDITIVES,, BULK,, PROPERTIES,, PROCESSED PVC.
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