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- W1982770660 abstract "The study of polyurethanes are of continuing interest due to their excellent physical properties. In this study, the reaction kinetics and polymerization conditions in two-step process of toluene diisocyante (TDI) and polypropylene glycol (PPG) with organo-tin mixed catalyst were investigated by di-n-butylamine back-titration. It was showed that the reaction obeyed the second-order equation of step-growth polymerization, the rate constants of TDI and PPG reaction at 50, 60 and 70°C were 0.0922, 0.3373 and 0.5828 kg•mol-1•min-1，respectively. The activation energy obtained from the result was 71.63 kJ•mol-1. The number average molecular weight (Mn) and molecular-weight distribution (Mw/Mn) of the polyurethane were 45175 and 1.53, respectively, and the content of hydrogen bonding in the N-H group from Fourier transform infrared spectrum (FTIR) was 80.75%, which manifested that the large amount of N-H were present in hydrogen bonding." @default.
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- W1982770660 date "2011-12-01" @default.
- W1982770660 modified "2023-09-26" @default.
- W1982770660 title "Study on the Reaction of TDI and PPG with Organo-Tin Mixed Catalyst" @default.
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- W1982770660 doi "https://doi.org/10.4028/www.scientific.net/amr.418-420.13" @default.
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