Title: 11B n.m.r. study on the reaction of poly(vinyl alcohol) with boric acid
Abstract: The crosslinking mechanism of an aqueous alkaline solution of poly(vinyl alcohol) (PVA) in the presence of boric acid was investigated by means of 11B 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.
Publication Year: 1988
Publication Date: 1988-02-01
Language: en
Type: article
Indexed In: ['crossref']
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Cited By Count: 119
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