| Summary: | 碩士 === 中興大學 === 化學工程學系所 === 95 === In this study, 2,2’-diisocyanate terminated TDI700 was obtained by reaction of 2,4-TDI and Mw.700 poly(oxypropylene) at a ratio of 2.2:1. GPC analysis showed us a good yield of low chain extended 2,2’-TDI700 around 76%.
In the model compound study, chemical shifts in the urethane and urea group derived from 2,4-TDI were clearly identified and widely used in our research.
Followed by reacting with ethylene diamine(EDA) at a pseudo high dilution condition, the ring closure of diisocyanate group on 2,2’-TDI700 was achieved with repeating unit of 1~2. The purified structure of cyclization product, EDA700, was confirmed by FTIR, NMR, MALDI-ToF mass analysis. However ,the GPC analysis of EDA700 did not agree with the mass analysis. By several indirect evidences, cyclic compound is considered to form aggregates.
In the ring opening polymerization of EDA700, effects of catalysts and temperature were studied. An unexpected release of EDA molecular during the reaction restricted the growth of molecular weight. The highest polymeric product was synthesized without any catalyst at 180℃ for 6 hours and showed only up to 8 repeating units with polydispersity of 1.31 in GPC analysis.
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