| Summary: | 碩士 === 國立臺北科技大學 === 有機高分子研究所 === 100 === Isothermal kintic and non-isothermal analysis of thermo-oxidative stabilzation (cyclization) process in polyacrylonitrile (PAN)-based copolymers was studied with use of the differential scanning calorimetry (DSC) data.The exothermic peaks of PAN-based copolymers made of acrylonitrile/methyl acrylate/dimethyl itaconate (AN/MA/DMI) terpolymers is much earlier cyclization reaction starts at lower temperature than PAN-based copolymers made of acrylonitrile/methyl acrylate(PAN/MA) dipolymers.
By avrami equation analysis the cyclization rate (k) increased when the temperature increased.However, we can observe that the more consists of dimethyl itaconate, the better decrease the cyclization reaction time and increase the cyclization rate (k) in PAN-based.
Based on the above results,we can regard dimethyl itaconate as a cyclization catalyst to PAN-based.In this paper, these observation were confirmed by structural characterization by FT-IR, measured molecular weigh using GPC, calculated consist of PAN-based copolymer by NMR.
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