Real-time Monitoring of Living Cationic Ring-opening Polymerization of THF and Direct Prediction of Equilibrium Molecular Weight of PolyTHF

An-ru Guo; Fan Yang; Rui Yu; Yi-xian Wu

doi:10.1007/s10118-015-1571-9

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Real-time Monitoring of Living Cationic Ring-opening Polymerization of THF and Direct Prediction of Equilibrium Molecular Weight of PolyTHF

PAPER | Updated：2021-06-21

- Real-time Monitoring of Living Cationic Ring-opening Polymerization of THF and Direct Prediction of Equilibrium Molecular Weight of PolyTHF
- Chinese Journal of Polymer Science Vol. 33, Issue 1, Pages: 23-35(2015)
- Affiliations：
  
  State Key Laboratory of Chemical Resource Engineering, Key Laboratory of Carbon Fiber and Functional Polymers (Ministry of Education), Beijing University of Chemical Technology, Beijing 100029, China
- Author bio：
  
  **Yi-xian Wu (吴一弦), E-mail: yxwu@163.com
- Funds：
- DOI：10.1007/s10118-015-1571-9
  CLC：
- Received：05 March 2014，
  
  Revised：2014-03-25，
  
  Accepted：03 April 2014，
  
  Published：2015-01
- Accepted：
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An-ru Guo, Fan Yang, Rui Yu, et al. Real-time Monitoring of Living Cationic Ring-opening Polymerization of THF and Direct Prediction of Equilibrium Molecular Weight of PolyTHF[J]. Chinese Journal of Polymer Science, 2015, 33(1): 23-35.
DOI：

An-ru Guo, Fan Yang, Rui Yu, et al. Real-time Monitoring of Living Cationic Ring-opening Polymerization of THF and Direct Prediction of Equilibrium Molecular Weight of PolyTHF[J]. Chinese Journal of Polymer Science, 2015, 33(1): 23-35. DOI： 10.1007/s10118-015-1571-9.

摘要

Abstract

A convenient real-time monitoring of monomer concentration during living cationic ring-opening polymerizations of tetrahydrofuran (THF) initiated with methyl triflate (MeOTf) has been developed for kinetic investigation and determination of equilibrium monomer concentration ([M]

)

via in situ

FTIR spectroscopy in combination with a diamond tipped attenuated total reflectance (ATR) immersion probe. The polymerization rate was first order with respect to monomer concentration and initiator concentration from the linear slope of ln([M]

−[M]

)/([M]−[M]

) versus polymerization time at different temperatures in various solvents. [M]

decreased linearly with initial monomer concentration while increased exponentially with increasing polymerization temperature. The equilibrium also strongly depends on solvent polarity and its interaction with monomer. The equilibrium polymerization time (

) decreased with increasing solvent polarity and decreased linearly with increasing [M]

in three solvents with different slopes to the same point of bulk polymerization in the absence of solvent. Equation of

= 72.1/(0.14–0.04[M]

) has been established to provide a simple and effective approach for the prediction for the number-average molecular weight of polyTHFs at equilibrium state (

) in the equilibrium living cationic ring-opening polymerization of THF at 0 °C.

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