Chinese Journal of Magnetic Resonance ›› 1995, Vol. 12 ›› Issue (2): 189-194.

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STUDIES ON THE RING STRUCTURES IN ATACTIC PVA KETALS BY 13C NMR Ⅱ.Theorctical Prcdiction and Experimental Determination of Ketal Rings Concentrations

Zhu Qingren1, Lu Fei1, Hong Kunlun1, Wen Jun1, Wang Lan1, Xu Guangzhi2   

  1. 1. Structure Research laboratory, USTC, Hefei 230026;
    2. Institute of Chemistry, The Chinese Academy of Sciences, beijing 1000080
  • Received:1994-05-15 Revised:1994-09-05 Published:1995-04-05 Online:2018-01-17

Abstract: The ring structures in the ketals obtained from the reactions of ketones with atactic PVA with different molecular weights have been studied by 13C NMR, The concentrations of different ketal rings were calculated and compared with the results de-termined by13C NMR, their difference were also discussed. It was found that there ex-ists a critical degree of polylnerization(molecular weight) for PVA to produce certain amount of ketal rings.

Key words: 13C NMR, Ketalization, Polyvinyl alcohol