ポリエ-テル系ポリウレタン網目の13C-NMRによるキャラクタリゼ-ション--原料・モデルウレタン・ウレア・アロハネ-ト

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13C_NMR spectra of polyether-polyurethanes, model compounds, and raw materials were measured in deuterated dimethylsulfoxide. Polyether-polyurethane networks were prepared from poly(oxypropylene) glycol (PPG), 2,4-tolylenediisocyanate (TDI) , and 1,4-butanediol (BD). Tolylenedialkylurethanes, tolylenedibutylurea, and α, γ-diphenylalkylallophanates were used as model compounds. The chemical shifts of carbonyl carbon were found at 125.43 and 124.08 ppm for TDI, 154 and 153 ppm for urethane, 155.39 and 155.28 ppm for urea, and 154 and 151 ppm for allophanate, respectively. The chemical shifts of urethane carbonyl peak of the soft segment model were different from those of the hard segment model. 13C-NMR spectra of network chains which were obtained by theamine degradation of PPG-TDI-BD polyurethane network showed five peaks in the range from 152.6 ppm to 154.3 ppm. Chemical shifts of aromatic carbon for 2,4-tolylene group were influenced by the structure of polar substituents. From these results, it is possible to distinguish between polar groups formed by polyurethane reaction.
長崎大学工学部の論文