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Title: Evolution of carbonyl index with time and its effects on polymer film performance
Authors: Debs, Asaad El
Advisors: Habib, Sami
Subjects: Plastics--Testing
Issue Date: 2015
Degradation in plastics is of upmost importance as it has a drastic effect on end-use properties. The study conducted consists of studying different techniques that can be used to follow and quantify the evolution of degradation in plastic Polyethylene (PE) agricultural films, designed for a three years lifetime. This evolution was tested using several techniques, including TGA, DSC, FTIR, spectrophotometry, tensile, and shear rheology. A correlation is made that relates the degradation behavior between these different techniques. Among this research, two machines were designed in order to make the project feasible, including a QUV weatherometer machine manufactured to meet ASTM standards. Also, a natural weathering Greenhouse prototype with a heating unit was designed. Correlation factors were set between these devices and an approved ASTM QUV lab machine. Four different blends were processed using a Formac Polifilm single screw blown film line, with 200 microns thickness and 2 blow up ratio (BUR). The sample obtained from blend 1 contains UV Master Batch (MB) that consists of UV absorber, antioxidant and Hindered Amine Light Stabilizer (HALS), sample 2 contains only UV absorber and Antioxidant for thermal stabilization, sample 3 contains Antioxidant with lower loading of UV MB and sample 4 is our benchmark pure polyethylene having no additives. Sample 1 currently used in industry showed similar behavior as sample 3, noting that sample 3 is more cost efficient and hence can now be adopted from the results of this study. Sample 4 displayed the quickest degradation response. What is key to note is that all tests showed similar trends.
Includes bibliographical references (p.52-53).

Supervised by Dr. Sami Habib.
Rights: This object is protected by copyright, and is made available here for research and educational purposes. Permission to reuse, publish, or reproduce the object beyond the personal and educational use exceptions must be obtained from the copyright holder
Ezproxy URL: Link to full text
Type: Thesis
Appears in Collections:UOB Theses and Projects

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