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Preparation and Characterization of Polymeric Composite Materials Using Natural Fibers in Bangladesh Environment

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dc.contributor.author KHATUN, MOST. AFROZA
dc.date.accessioned 2024-03-12T04:10:15Z
dc.date.available 2024-03-12T04:10:15Z
dc.date.issued 2024-03-12
dc.identifier.uri http://repository.library.du.ac.bd:8080/xmlui/xmlui/handle/123456789/3068
dc.description A Thesis Submitted to the Department of Applied Chemistry and Chemical Engineering, University of Dhaka, in Partial Fulfilment of the Requirements for the Degree of Doctor of Philosophy (PhD). en_US
dc.description.abstract Natural fibers have drawn a lot of interest for the use of reinforcing materials in composites as a sustainable and renewable resource. By adopting a compression molding technique and varying fiber contents (5, 10, 15, 20 and 25 wt%), short date palm mat (DPM) fiber reinforced HDPE and polystyrene (PS) composites were prepared. Physical, mechanical, structural, thermal, morphological, and biodegradation properties were examined. 10% DPM fiber reinforced composites exhibited optimum mechanical properties. The DPM fibers were subjected to different percentages of NaOH treatment to enhance the fiber-matrix adhesion. The maximum value of mechanical properties was attained for the composites treated with 5% NaOH. ZnO nanoparticles as nano filler was also used to improve the mechanical properties of the composites. The composites with 3% ZnO nanoparticles showed highest mechanical properties. The produced optimized samples were exposed to various gamma radiation doses, and the results for all types of composites were best when exposed to 5 kGy of gamma radiation. Further, three fire retardant additives namely, monosodium phosphate, monoammonium phosphate and magnesium hydroxide were used in the composites and monoammonium phosphate displayed best fire retardant properties. A biodegradable composite was developed using various percentages of DPM fiber and polylactic acid (PLA). 10% DPM fiber reinforced PLA composite presented highest results. A hybrid composite was made using date palm mat (DPM) and palmyra palm fruit (PPF) fiber with HDPE matrix. A hybrid composite with 5% fiber content achieved better properties. Crystalline nanocellulose were extracted from DPM fibers and used to prepare nanocomposite films. 9% crystalline nanocellulose containing nanocomposite films revealed highest mechanical properties. The characteristics of these newly created composites indicate potential applications in various fields. en_US
dc.language.iso en en_US
dc.publisher ©University of Dhaka en_US
dc.subject Date Palm Mat (DPM) en_US
dc.subject High Density Polyethylene (HDPE) en_US
dc.subject Polystyrene (PS) en_US
dc.subject Composite en_US
dc.subject Gamma radiation en_US
dc.subject Crystalline nanocellulose en_US
dc.title Preparation and Characterization of Polymeric Composite Materials Using Natural Fibers in Bangladesh Environment en_US
dc.type Thesis en_US


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