Synthesis of Polystyrene and Molecular Weight Determination by 1H NMR End-Group Analysis

Jay Wm. Wackerly ^[1] ; James F. Dunne ^[1]
1. [1] Central College
  
  Central College
  
  Township of Lake Prairie, Estados Unidos
Localización: Journal of chemical education, ISSN 0021-9584, Vol. 94, Nº 11, 2017, págs. 1790-1793
Idioma: inglés
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Resumen
- A procedure for the solution polymerization of styrene using di-tert-butyl peroxide (DTBP) as the initiator is described. The use of DTBP allows for end-group analysis by 1H NMR spectroscopy and calculation of the number-average molecular weight of the polymer. This experiment was designed as a laboratory introduction to polymer chemistry for second-year undergraduate students. The highest-order focus was to get students to derive an equation to calculate the number-average molecular weight by 1H NMR spectral analysis.