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报道了用￣（１３）ＣＮＭＲ研究不同聚合度无规立构聚乙烯醇与丙酮、丁酮反应所形成缩酮环的结构及浓度，并与理论估算值进行了比较，讨论了实际成环浓度与理论值差别的原因，并根据不同聚合度ＰＶＡ缩酮化结果发现ＰＶＡ缩酮化反应存在一个临界聚合度Ｎｏ。
The structure and concentration of ketal ring formed by reaction of atactic polyvinyl alcohol with different polymerization degree with acetone and butanone using ~ (13) CNMR have been reported. Compared with the theoretical value, the actual ring formation concentration And the theoretical value of the reasons for the difference, and according to the different degree of polymerization PVA ketalization results found that the PVA ketalization reaction there is a critical degree of polymerization No.