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dc.contributor.authorDalal Ali Abdulwahab Al-Qallafen_US
dc.description.abstractMaterials made from starch-polymer composites, which can be recycled and are completely biodegradable, are an inexpensive substitute to those polymers derived from crude oil. Starch, a polysaccharide which is derived from plants and has three hydroxyl groups for every glucose monomer unit, is basically a multifunctional polymer. In this research work the development and characterization of starch and recycled high density polyethylene (HDPE) blends compatibilized via a melt extrusion process are studied .The matrix polymer chosen was recycled HDPE. Potato starch (PS), Corn starch (CS) and a high density polyethylene grafted maleic anhydride (PE-g-MAH) compatibilizer were melt blended in a twin screw extruder. The amount of starch (PS and CS) in the blends was varied from 5 to 10% by weight. The viscosity of the blends exhibited shear thinning characteristics. UV irradiation of the starch based recycled polyethylene blends for a time period of 60 days showed a decline in the viscosity, storage and loss modulus. With increasing amount of starch in the recycled HDPE / starch blends, the tensile modulus was observed to increase while the tensile strength and percentage elongation was seen to decrease. The mechanical behavior depends on how well the starch is diffused in the polymer matrix. Another plausible reason for low mechanical properties could be weak interfacial adhesion between different polymeric phases. Variations in the molecular geometry, thermal behavior, mechanical, and rheological characteristics, as a function of UV exposure time are investigated. It is observed that the rheological and mechanical attributes of the recycled HDPE / starch blends, UV treated for maximum number of days (60) depict poor mechanical and rheological properties.en_US
dc.publisher Kuwait university - college of graduate studiesen_US
dc.subjectChemical Engineering Biodegradable Polymers Starch UV Irradiation Properties Thermal Rheological Mechanicalen_US
dc.titleEffect of Starch Loading and UV Irradiation on the Thermal, Mechanical, and Rheological Properties of Biodegradable Polymersen_US
dc.title.alternativeتأثير تركيز النشا والأشعة فوق البنفسجية على الخواص الحرارية والميكانيكية والريولوجية للمواد القابلة للتحللen_US
dc.contributor.supervisorProf. Habib I. Shabanen_US
dc.description.conclusionsPE-g-MAH was used as a compatibilizer to develop compatibilized blends of recycled HDPE / starch (PS and CS) by the melt blending method. The presence of starch in HDPE / starch blends decreased the melting temperature of the compatibilized and the uncompatibilized system. The tensile strength and percentage elongation at break decreased with an increase in the starch content in the blends, but an increase was noted for tensile modulus. Reaction between recycled HDPE and starch blends was studied using FTIR and the results confirmed that there is a chemical interaction occurring between starch and HDPE in the presence of a compatibilizer PE-g-MAH. Rheological studies clearly indicated that compatibilized blends have better viscosity, elastic modulus and loss modulus values compared to uncompatibilized HDPE/starch blends. It is also noticed that the later properties were lower to the parent polymer (recycled HDPE). SEM studies indicated that exposure of HDPE / starch blend for more number of days to UV irradiation resulted in formation of chemical changes due to photo induced reactions, leading to poor mechanical properties. AFM studies indicated that greater starch concentration leads to greater immiscibility, even though a compatibilizer like PE-g-MAH is used.en_US
dc.relation.program0640 Chemical Engineering en_US
Appears in Programs:0640 Chemical Engineering
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