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Preparation and characterization of low density polyethylene/modified chitosan/papain composite

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dc.contributor.advisor Adikary, SU
dc.contributor.author Samarasekara, AMPB
dc.date.accessioned 2011-05-26T10:27:14Z
dc.date.available 2011-05-26T10:27:14Z
dc.date.issued 5/26/2011
dc.identifier.uri http://dl.lib.mrt.ac.lk/theses/handle/123/891
dc.description A thesis submitted to the Department of Materials Science and Engineering for the Degree of Master of Philosophy (Author requested not to publish full text.) en_US
dc.description.abstract The objective of this research was to impart biodegradability to a polyethylene blend using Chitosan as the main additive which was extracted from fishery waste. Papain, a natural enzyme derived from papaya plant, was also used to enhance the biodegradability. The biodegradability of this Polyethylene blend was studied using low molecular weight chitosan both in the presence and absence of papain. The influence of concentration and type of alkali on the chitin yield and chitosan obtained from deacetylation process were investigated. Low molecular weight chitosan was prepared by different depolymerization methods. This study investigated the time dependent weight loss using soil burial test, stress – strain properties and water absorption properties of the developed polymer, to evaluate the degree of biodegradability. The Fourier transform infrared spectroscopy (FTIR), Differential thermal analysis (DTA), Thermogravimetric analysis (TGA) and optical and Scanning electron microscopic investigation (SEM) were used to determine the properties of LDPE – Chitosan – Papain composite. The optimum composition for the industrial trial production was selected by considering the tensile strength, elongation, optimum degradability as well as good processability. Industrial trial production was done using composition containing of LDPE with 5% chitosan and 3% papain by weight. Soil burial test results showed that specimens degraded by 60% in a six month period, while complete degradation occurred after one year. Since experimental analysis did not indicate formation of new bonds, it could be concluded that Chitosan, LDPE and Papain are present in the final product as a physical mixture without any detectable chemical reactions among different constitutes. Products manufactured in industrial scale also showed appreciable biodegradable properties. The biodegradation mechanism proposed for LDPE – Chitosan – Papain composite is based on the hydrolysis followed by actions of microorganisms. en_US
dc.description.abstract The objective of this research was to impart biodegradability to a polyethylene blend using Chitosan as the main additive which was extracted from fishery waste. Papain, a natural enzyme derived from papaya plant, was also used to enhance the biodegradability. The biodegradability of this Polyethylene blend was studied using low molecular weight chitosan both in the presence and absence of papain. The influence of concentration and type of alkali on the chitin yield and chitosan obtained from deacetylation process were investigated. Low molecular weight chitosan was prepared by different depolymerization methods. This study investigated the time dependent weight loss using soil burial test, stress – strain properties and water absorption properties of the developed polymer, to evaluate the degree of biodegradability. The Fourier transform infrared spectroscopy (FTIR), Differential thermal analysis (DTA), Thermogravimetric analysis (TGA) and optical and Scanning electron microscopic investigation (SEM) were used to determine the properties of LDPE – Chitosan – Papain composite. The optimum composition for the industrial trial production was selected by considering the tensile strength, elongation, optimum degradability as well as good processability. Industrial trial production was done using composition containing of LDPE with 5% chitosan and 3% papain by weight. Soil burial test results showed that specimens degraded by 60% in a six month period, while complete degradation occurred after one year. Since experimental analysis did not indicate formation of new bonds, it could be concluded that Chitosan, LDPE and Papain are present in the final product as a physical mixture without any detectable chemical reactions among different constitutes. Products manufactured in industrial scale also showed appreciable biodegradable properties. The biodegradation mechanism proposed for LDPE – Chitosan – Papain composite is based on the hydrolysis followed by actions of microorganisms.
dc.format.extent xii, 83p. : ill. en_US
dc.language.iso en en_US
dc.subject MATERIALS SCIENCE AND ENGINEERING - Thesis en_US
dc.subject POLYETHYLENES - Biodegradability en_US
dc.subject COMPOSITE MATERIALS - Applications en_US
dc.title Preparation and characterization of low density polyethylene/modified chitosan/papain composite en_US
dc.type Thesis-Abstract
dc.identifier.faculty Engineering en_US
dc.identifier.degree MSc en_US
dc.identifier.department Department of Materials Science and Engineering en_US
dc.date.accept 2010-01
dc.date.accept 2010-01
dc.identifier.accno 96386 en_US


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