B-11 NMR-STUDY ON THE REACTION OF POLYVINYL-ALCOHOL) WITH BORIC-ACID
B-11 NMR-STUDY ON THE REACTION OF POLYVINYL-ALCOHOL) WITH BORIC-ACID
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DOI：
10.1016/0032-3861(88)90343-6
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发表时间：
1988-02-01
期刊：
影响因子：
4.6
通讯作者：
NOMURA, S
中科院分区：
文献类型：
--
作者：
SHIBAYAMA, M;SATO, M;NOMURA, S
采用11b核磁共振（n.m.r）研究了硼酸存在下聚乙烯醇（PVA）水溶液的交联机理。选择2-丙醇和2,4-戊二醇分别作为PVA的单体和二聚体模型样品。在2-丙醇的情况下，只观察到一个强信号，这与没有酒精的情况相同。相比之下，2,4-戊二醇和PVA有两个不同的信号，其中一个是1,3-二醇所特有的，即戊二醇和PVA。结果表明，单羟基醇不与硼酸反应，而具有1,3-二醇结构的二羟基醇和多羟基醇则与硼酸反应。化学位移信号的温度依赖性表明产物为所谓的单二醇型而非双二醇型，这与PVA与硼酸反应的传统概念不一致。
The crosslinking mechanism of an aqueous alkaline solution of poly(vinyl alcohol) (PVA) in the presence of boric acid was investigated by means of11B nuclear magnetic resonance (n.m.r.). 2-Propanol and 2,4-pentanediol were chosen as monomeric and dimeric model samples of PVA, respectively. In the case of 2-propanol, only one strong signal was observed, which was the same as in the case without alcohol. By contrast, 2,4-pentanediol and PVA had two distinct signals, one of which was unique to 1,3-diols, i.e. pentanediol and PVA. It is concluded that monohydroxyl alcohol does not react with boric acid, whereas diand polyhydroxyl alcohols having the structure of 1,3-diol do. The temperature dependence of the chemical shift of the signals shows that the product is a so-called monodiol type but not a didiol type, which is not consistent with the conventional concept of PVA and boric acid reaction.