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Long branching in poly(vinyl acetate) and poly(vinyl alcohol). I. Crosslinking and crosslinking cleavage of poly(vinyl acetate)

โœ Scribed by Nozakura, Shun-Ichi ;Morishima, Yotaro ;Murahashi, Shunsuke

Publisher
Wiley (John Wiley & Sons)
Year
1972
Tongue
English
Weight
637 KB
Volume
10
Category
Article
ISSN
0449-296X

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โœฆ Synopsis

Abstract

A crosslinked network was formed by the reaction of partially saponified poly(vinyl acetate) and toluylene diisocyanate in benzene. The yield of gel was markedly dependent on the degree of saponification and the concentrations of polymer and diisocyanate. Crosslinked poly(vinyl alcohol) was obtained by treating the poly(vinyl acetate) with a catalytic amount of sodium hydroxide in methanol without any change of the urethane crosslinks. The crosslink based on the urethane linkage was quantitatively cleaved by acids, especially by hydrobromic acid, releasing polymers of the same molecular weight as the original.

๐Ÿ“œ SIMILAR VOLUMES

Long branching in poly(vinyl acetate) an
Long branching in poly(vinyl acetate) and poly(vinyl alcohol). II. Polymerization of vinyl acetate in the presence of crosslinked poly(vinyl alcohol)
โœ Nozakura, Shun-Ichi ;Morishima, Yotaro ;Murahashi, Shunsuke ๐Ÿ“‚ Article ๐Ÿ“… 1972 ๐Ÿ› Wiley (John Wiley & Sons) ๐ŸŒ English โš– 555 KB

## Abstract It is a common view that poly(vinyl acetate) has many branches at the acetyl side group, but that the corresponding poly(vinyl alcohol) has little branching. In order to study the branching in poly(vinyl acetate) and poly(vinyl alcohol) which is formed by chain transfer to polymer, the

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