| Summary: | 碩士 === 國立臺北科技大學 === 分子科學與工程系有機高分子碩士班 === 107 === Polyethylene terephthalate (PET) is an important thermoplastic polyester. Due to the increasing attention to environmental issues in recent years, waste disposal has become an important social issue. PET recycling seems to be an ideal waste treatment. However, the repeated heat treatment of PET materials may cause reduced properties due to thermal degradation. In this study, amphiphilic block copolymer macromolecules were synthesized by atom transfer radical polymerization (ATRP) to improve the properties of the recycled products. It is expected that the recycled PET maintain its original physical properties, while the viscosity and mechanical properties are significantly improved. The materials selected were monomers 2-Hydroxyethyl methacrylate (HEMA) and Glycidyl methacrylate (GMA). The macroinitiator poly(HEMA)-Br was prepared as the first segment of the diblock copolymer by using ATRP as the HEMA monomer, followed by, the second segment that was based on the macroinitiator Poly(HEMA)-Br which was bonded with GMA monomer by ATRP. The synthesized diblock copolymer Poly(HEMA)-b-Poly(GMA) was then subjected to 1H-NMR characterization and gel permeation chromatography (GPC) for analysis of molecular weight and its distribution. The main goal is to use of chain extension functional compounds and PET end-group reaction, so that in the process of processing and use of broken polymer chain can be re-combined, in order that polymer molecules have higher molecular weight and improved properties, to improve the recycled PET properties. The use of twin screw extruder to successfully make a variety of copolymers, its through the Ostwald Viscometer, SS curves can obtain excellent mechanical properties. It is expected to make a splash in future applications for environmentally friendly recycling of PET, such as eco-friendly yarn, packaging materials and photographic film.
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