Kim, Jaehoon Gracz, Hanna S. Roberts, George W. Kiserow, Douglas J. 2024-01-21T00:01:33Z 2024-01-21T00:01:33Z 2021-08-31 2008-01-21 0032-3861 https://pubs.kist.re.kr/handle/201004/133814 Quantitative structural and end-group analysis of poly(bisphenol A carbonate) (BPA-PC) was carried out and number average molecular weights (M.) were determined using 125.76 MHz C-13 and 500.13 MHz H-1 nuclear magnetic resonance (NMR) spectroscopy. BPA-PC with a wide range of end-group ratios (0.26-2.83) and number average molecular weights (1500-9000 g/mol) was synthesized using melt transesterification by changing the initial monomer (bisphenol A and diphenyl carbonate) ratios and reaction conditions. Results of the NMR analysis for the melt-polymerized samples were compared with those of a commercial BPA-PC with a M. of 16,000 g/mol. It was demonstrated that NMR spectroscopy is a very selective and accurate method not only for quantification of both phenolic and phenyl chain end-groups but also in the structural analysis of main chain groups. Extremely small concentrations of end-groups (similar to 0.02 per repeating unit) were analyzed. In addition, NMR spectroscopy was found to be an excellent tool for detecting residual monomer and the presence of the reaction byproduct (phenol). The molecular weights that were determined using NMR end-group quantification agreed well with the molecular weights measured by gel-permeation chromatography (GPC). (c) 2007 Elsevier Ltd. All rights reserved. English ELSEVIER SCI LTD BISPHENOL-A POLYCARBONATE NUCLEAR MAGNETIC-RESONANCE PHENOLIC END-GROUPS HYDROLYSIS OLIGOMERS Spectroscopic analysis of poly(bisphenol A carbonate) using high resolution C-13 and H-1 NMR Article 10.1016/j.polymer.2007.11.046 1 POLYMER, v.49, no.2, pp.394 - 404 POLYMER 49 2 394 404 scie scopus 000253266900005 2-s2.0-38349075025 Polymer Science Polymer Science Article BISPHENOL-A POLYCARBONATE NUCLEAR MAGNETIC-RESONANCE PHENOLIC END-GROUPS HYDROLYSIS OLIGOMERS poly(bisphenol A carbonate) end-group analysis NMR spectroscopy