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测定了PET/30PHB和PET/60PHB共聚酯的高分辨~1H和~(13)C谱,并采用INEPT方法和部分弛豫FT技术确定了季碳吸收峰,对NMR谱进行了归属.应用我们先前提出的方法对共聚酯的序列分布进行了表征.结果表明,两种共聚酯的无规度B_q值均小于1,序列分布不象Jackson等认为的那样为完全无规的.此外,文中还指出,某些研究者套用Flory公式判别PET/PHB共聚酯是否为无规的不妥之处.
The high resolution 1H and ~ (13) C spectra of PET / 30PHB and PET / 60PHB copolyesters were determined, and the quaternary carbon absorption peak was determined by INEPT method and partial relaxation FT technique. The sequence distributions of the copolyesters we characterized previously were characterized. The results show that both copolyesters have a random Bq value of less than 1 and the sequence distribution is not completely random as thought by Jackson et al. , The paper also pointed out that some researchers apply the Flory formula to determine whether PET / PHB copolyester is a random error.