| Summary: | 碩士 === 國立臺北科技大學 === 化學工程與生物科技系化學工程碩士班 === 107 === Polyethylene terephthalate (PET) is a very widely used thermoplastic resin. Because it is not biodegradable, PET recycling and reusing, so called r-PET, has become an important issue in environmental protection. The recycling process leads to the polymer chain scissions of r-PET, which limits its applications. The purpose of this study is to explore the feasibility to increase the molecular weight of r-PET by solid state polymerization with adding additives. At the same time the processability of r-PET was investigated by numerical simulation. It is hoped that the improved solid state polymerization process will become a powerful means to enhance the value of recycled materials.
The r-PET used in this study is mixed with the surface-modified nanoporous carbon in the the process of granulation and then polymerized in solid state. Rheological and thermal analysis of the resulting r-PETs are carried out by capillary rheometer, TGA, DSC, etc., to establish a spectrum of database and to evaluate the effect of solid state polymerization on the r-PET. The results show that the efficiency of solid state polymerization is significantly promoted by adding additives, but the additives may affect the Thermal stability and absorption of moisture from the r-PET. In the latter part of the study, the rheological and thermal database was imported into the simulation software VEL to analyze the internal melt flow phenomenon of the r-PET in extrusion and spinning die. The possible processing problems were reported and suitable processing measures were proposed to provide a vital reference of its applications of r-PET.
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