SOME STUDIES ON ABS/PVC POLYBLENDS UNDER NATURAL AND AGGRESSIVE CONDITIONS
SOME STUDIES ON ABS/PVC POLYBLENDS UNDER NATURAL AND AGGRESSIVE CONDITIONS
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Date
1979-03
Authors
ENUMA MBAMALI, GLADYS
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Abstract
Acrylonitrile Butadiene Styrene (ABS) which has been
previously stabilised against heat and UV irradiation has
been added in the form of Masterbatches to modify PVC*
The general procedure followed was to compare the
effects of these additives, in the RAPRA torque Rheometer at
170 C, with conventional unstabilised ABS (when used to
modify the strength) and with conventional PVC stabiliser
(when used as a stabiliser).
The samples used for testing were prepared from
compression moulded films and were heated in an air oven and
also exposed to sunlight for various lengths of time*
Changes in the chemical and physical properties were
examined by IR spectroscopy and tensile strength measurements*
It was found that the photooxidation of ABS follows
first order kinetics and proceeds through the oxidation of
the double bond. Blending ABS with PVC damaged the weatherability
of PVC from chemical and physical aspects. It could
also be shown that previously stabilised ABS added to PVC|
gave no protection to PVC. However, it was found that a
combination of commercial stabiliser, Irgastab T2q_, and
EBHPT (added as Masterbatch) gave a relatively good protection
to PVC during thermal ageing and UV i r r a d i a t i o n * The commercial
thermal s t a b i l i s e r proved b e t t e r than 3HBM (added as masterfoatch)
for s t a b i l i s i n g impact-modified PVC. Long processing times
did a lot of damage to the polyblend and is therefor© not
d e s i r a b l e technically* A blend containing lO-20% A3S and about
80% PVC proved to have the greatest elongation at break*
It was found also that the blending of PVC with A3S led to a
decrease in t e n s i l e strength, A c o r r e l a t i o n e x i s t s betv/een
t h e embrittlement time of the sample and i t s mechanical
behaviour*
Description
A Thesis Presented to the Ahmadu Bello University
In Partial Fulfillment for the Degree of:
MASTER OF SCIENCE
IN POLYMER SCIENCE AND TECHNOLOGY
By
GLADYS ENUMA MBAMALI
MARCH, 1979
Keywords
STUDIES,, ABS/PVC,, POLYBLENDS,, NATURAL,, AGGRESSIVE CONDITIONS