SOME STUDIES ON THE BLENDS OP POLY (VINYL ACETATE) AND POLY(ETHYL METHACRYLATE).

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dc.contributor.authorIBIYEYE, MARGARET KUDIRAT
dc.date.accessioned2014-02-11T09:54:51Z
dc.date.available2014-02-11T09:54:51Z
dc.date.issued1984-07
dc.descriptionA THESIS SUBMITTED TO THE POSTGRADUATE SCHOOL, AHMADU BELLO UNIVERSITY, IN PARTIAL FULFILMENT OF THE REQUIREMENTS FOR THE DEGREE OF MASTER OF SCIENCE IN POLYMER SCIENCE AND TECHNOLOGY.en_US
dc.description.abstractStudies have been conducted on blending of Polyvinylacetate with Polyethylmethacrylnte. Polyvinylacetate and Polyethylmethacrylate samples were prepared using emulsion polymerisation method under different conditions to obtain polymers of varying molecular characteristics. The viscosity average molecular weight of each polymer was determined. Four different methods were used to assess and characterise the type of interaction taking place in the two polymers when blended together. Study of the blends of PVAc and PEMA by dilute solution viscosity revealed two types of interactions viz PVAc - PEMA intermolecular interaction which increases with molecular weight of PEMA and molecular weight ratio of the polymers. This type of interaction leads to formation of blends with co-operative forces of stabilisation which are superior to those of the pure polymers. The other type of interaction is the PVAc or PEMA intramolecular interaction which leads to independent behavior of the two polymers, and decreases with increase in molecular weight of PEMA and the molecular weight ratio of the polymers. viii From the Melt Flow Index study of the melt form of PEMA and PVAc blends, one form of interaction predominates, namely the PVAc - PEMA intermolecular interaction which increases with the molecular weight of PEMA and therefore leads to an improvement in the melt flow characteristics of either of the two polymers. Also a mode of interaction has been suggested in which PEMA acts as a surface on which FVAc is arranged, thus improving the macromolecular arrangement in the melt. Mechanical study of films of the blends were carried out on the Instron testing Machine. Two types of interaction existed between the polymers namely the PVAc - PEMA intermolecular interaction which leads to blends which are strong and of superior properties to those of the individual polymers, and the other from weak Vander Waals forces due to the PVAc or PEMA intermolecular and possibly intramolecular attractions between the molecules of the polymers, leading to the formation of inferior blends. These properties are strongly depended on the molecular weight ratio (Mv) for the two polymers i.e. MV PEMA /MV PVAC. Optical microscopy was also used to aid in determining not only the presence but the connectivities of the phases representing each polymer.en_US
dc.identifier.urihttp://hdl.handle.net/123456789/1098
dc.language.isoenen_US
dc.subjectSTUDIESen_US
dc.subjectBLENDSen_US
dc.subjectPOLYen_US
dc.subject(VINYL ACETATE)en_US
dc.subjectETHYL METHACRYLATE).en_US
dc.titleSOME STUDIES ON THE BLENDS OP POLY (VINYL ACETATE) AND POLY(ETHYL METHACRYLATE).en_US
dc.typeThesisen_US
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