| Summary: | 碩士 === 國立臺北科技大學 === 有機高分子研究所 === 96 === The influence of recycle processes, including crusher, granulation and injection, on the properties of Isotactic Polypropylene (iPP) is investigated in this study. The results show that the properties of recycled iPP such as melt flow index (MFI), heat deflection temperature (HDT), flexural test (flexural strength and flexural modulus) and tensile test are high than that of virgin iPP, except impact strength with a little variation. The mechanical of iPP after several recycles seems not to be reduced but improved. It shows that the property of iPP is stable after several processing processes. In addition, crystallize behavior, molecular changes and thermal property is investigated by FTIR, XRD, GPC, DSC and DMA. The data illustrates that only Tg、tanδand Tm are decreased but crystallize temperature, melting enthalpy, crystallinity, crystallization rate, loss modulus, storage modulus and molecular distribution are increased. The morphology of crystal is unchanged. The carbonyl group is not seen through FTIR exam. There is no oxygenize degradable in recycled iPP. It concludes that iPP owns a good recycled processing and good heat endurance after several manufacturing processes.
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