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采用FT-NMR波谱仪,以氘代二甲基亚矾为溶剂,测定了未知结构聚氨酯(PU)弹性体的~1H-,~(13)C-NMR谱。选用萘为模型化合物,假设1,5位上的氢被-NH-CO-CH_3取代,根据取代基经验加和规律,计算了1,5位取代萘的各碳化学位移,对应归属了实测试样的~(13)C-NMR谱。综合分析~1H-,~(13)C-NMR图谱,确认该弹性体为乙二醇-己二酸-1,5-萘基二异氰酸酯的聚酯型PU,其三组分的摩尔比为52.2∶38.9∶8.9。
The ~ 1H-, ~ (13) C-NMR spectra of unknown structural polyurethane (PU) elastomers were determined by FT-NMR spectroscopy and deuterated dimethyl sulfoxide as solvent. Naphthalene is chosen as the model compound. Assuming that the hydrogen in the position 1,5 is replaced by -NH-CO-CH_3, the carbon chemical shifts of 1,5-substituted naphthalene are calculated according to the rule of additive experience. Correspondingly, Like ~ (13) C-NMR spectrum. Comprehensive analysis ~ 1H-, ~ (13) C-NMR spectra confirmed that the elastomer is ethylene glycol-adipate-1,5-naphthalene diisocyanate polyester PU, the molar ratio of the three components is 52.2: 38.9: 8.9.