Polymerization Mechanism in the Presence of 1,1-Diphenylethylene Part 2: Synthesis and Characterization of PMA and PSt

摘要

The polymerization of methyl acrylate and styrene in the presence of 1,1-diphenylethylene (DPE) is investigated to monitor the impact of different monomers on the structure of DPE-containing polymers. Poly(methyl acrylate) (PMA) and polystyrene (PSt) with low molecular weight are synthesized and characterized. According to the results of the H-1 nuclear magnetic resonance (H-1-NMR) spectroscopy, DPE is incorporated into PMA and PSt polymer chains as diphenyl-substituted structure. The resulting PMA polymers containing only one DPE unit show good agreement with the mass spectrometry results obtained by electrospray-ionization quadrupolar time-of-flight mass spectrometry. The gel permeation chromatography results of PSt polymers are consistent with the molecular weight obtained by H-1-NMR, indicating that each PSt polymer chain has only one DPE molecule.