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Title: Effect of Starch Loading and UV Irradiation on the Thermal, Mechanical, and Rheological Properties of Biodegradable Polymers
Other Titles: تأثير تركيز النشا والأشعة فوق البنفسجية على الخواص الحرارية والميكانيكية والريولوجية للمواد القابلة للتحلل
Authors: Dalal Ali Abdulwahab Al-Qallaf 
Supervisor: Prof. Habib I. Shaban
Keywords: Chemical Engineering Biodegradable Polymers Starch UV Irradiation Properties Thermal Rheological Mechanical
Issue Date: 2015
Publisher:  Kuwait university - college of graduate studies
Abstract: Materials 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.
Appears in Programs:0640 Chemical Engineering

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