| Summary: | 碩士 === 國立高雄第一科技大學 === 環境與安全衛生工程所 === 98 === This research it’s purpose is to discuss in the mode of pyrolysis the change of pyrolysis of polypropylene after several times of recycling, with theoretical methods to analyze and study the effect of frequency of recycling on the parameters of pyrolysis of polypropylene. Using methods as Friedman method, Freeman method, Ozawa method and others to obtain kinetics model simulation and compare the difference between them all with an end of knowing it’s fitness in this study. Polypropylene is used as experimental material, which is put under the environment of simulation to the real variation of climate and sunshine with the help of UV weathering test machine, and then recycle it. We use TGA in three different heating rates of 5K/min, 10k/min and 15k/min analyzing in nitrogen gas. The result will go through these three methods: Friedman Method, Freeman-Carroll Method, Ozawa Method to get the reaction rate of every condition. Then we put the parameter that we get from the three methods into Arrhenius Model to get the reaction rate and compare with TGA for experiment value.
The result shown that the calculated and experiment value of five samples PPnew、PPr1、PPr2、PPr3、PPr5 through Friedman Method , Freeman Method, Ozawa Method these three methods in three different heating rates of 5K/min, 10K/min and 15K/min all have R2 greater than 0.9 , they all fit well in this study. We could know that activity energy decreased when exposing to UV and more reused-times through Broken-recovery.
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