SOME STUDIES ON ABS/PVC POLYBLENDS UNDER NATURAL AND AGGRESSIVE CONDITIONS

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dc.contributor.authorENUMA MBAMALI, GLADYS
dc.date.accessioned2014-02-10T10:24:04Z
dc.date.available2014-02-10T10:24:04Z
dc.date.issued1979-03
dc.descriptionA 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, 1979en_US
dc.description.abstractAcrylonitrile 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*en_US
dc.identifier.urihttp://hdl.handle.net/123456789/845
dc.language.isoenen_US
dc.subjectSTUDIES,en_US
dc.subjectABS/PVC,en_US
dc.subjectPOLYBLENDS,en_US
dc.subjectNATURAL,en_US
dc.subjectAGGRESSIVE CONDITIONSen_US
dc.titleSOME STUDIES ON ABS/PVC POLYBLENDS UNDER NATURAL AND AGGRESSIVE CONDITIONSen_US
dc.typeThesisen_US
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