EFFECTS OF ADDITIVES ON BULK PROPERTIES OF PROCESSED PVC
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.