3 years ago

Determination of ceiling temperature and thermodynamic properties of low ceiling temperature polyaldehydes

Determination of ceiling temperature and thermodynamic properties of low ceiling temperature polyaldehydes
Paul A. Kohl, Jihyun Lee, Jared M. Schwartz, Oluwadamilola Phillips, Anthony Engler
Knowledge of the ceiling temperature and thermodynamic variables for low ceiling temperature polymers is critical to understanding the material's synthesis and use. Synthesis of the polymer below its ceiling temperature is the routine polymerization route. In situ 1H NMR of the equilibrium polymerization reaction can provide critical information for determining the enthalpy and entropy of polymer formation. Three polyaldehydes were synthesized with in situ 1H NMR, and their energies of formation were determined for the linear region of ceiling temperature. Insights into the mechanism of polymerization were also found using this method. © 2017 Wiley Periodicals, Inc. J. Polym. Sci., Part A: Polym. Chem. 2017 The polymerization of a low ceiling temperature polymer is typically performed below its ceiling temperature. Determining the ceiling temperature can be difficult. Three polyaldehydes were synthesized by a 1H in situ NMR method to determine the enthalpies and entropies of formation as well as the ceiling temperatures. Unique insights into the polymerization mechanisms were also observed.

Publisher URL: http://onlinelibrary.wiley.com/resolve/doi

DOI: 10.1002/pola.28888

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