Peng Yang, Y. Yu, S. Wang
Nov 1, 2011
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Influential Citations
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Journal
International Journal of Polymer Analysis and Characterization
Abstract
Isophorone diisocyanate is used to react with poly (propylene oxide) of 1000 number average relative molecular mass in different temperatures. In situ FT-IR is used to monitor the reaction to work out rate constant, Arrhenius equation, and Eyring equation. The polymerization reaction has been found to be a second-order reaction, and rate constant seems different between the first stage and second stage at 5°∼10°C. However, it is surprising that the reactivity difference disappeared and the reaction rate merges when reaction temperature increases. The 1/(1 − p)∼t curves become straight at 15°∼25°C. Finally, the activation energy (E a), activation enthalpy (ΔH), and activation entropy (ΔS) for the polymerization are calculated, which are 73.9 KJ · mol−1, 71.6 KJ · mol−1, and −21.0 J · mol−1 · k−1, respectively.