7V-Vinylpyrrolidone

Reactivity ratios of a number of activated acrylates and methacrylates with different structural monomers are given in Table 2. Polymer compositions produced at low conversions from equimolar monomer fe compositions are also indicated in the Table. These values are back calculated from the reactivity ratios, and are hence equivalent to experimental data. The actual copolymeriz-ability patterns of three comonomer pairs are also shown in Fig. 4. These results show that, among the various monomer pairs, AOTcp with styrene, and AOTcp with 7V-vinylpyrrolidone, produce azotropic copolymers at about equimolar monomer feed compositions. The relatively small reactivity ratios of these two monomer pairs indicate that their equimolar copolymerization produces approximately alternating, rather than random or block, copolymers. 

V-Vinylpyrrolidone is prepared from 1,4-butanediol (Section 14.3.2.1.) as follows ... 

A patent [60] states that batch polymerizations of 7V-vinylpyrrolidone in aqueous solution with hydrogen peroxide often give rise to gel formation. This difficulty can be overcome by replacing at least part of the water with such substances as isopropyl alcohol, thioglycolic acid, dimethylformamide, ethanolamine, methyl ethyl ketone, trichloroacetic acid or 2-mercaptoethanol. A continuous polymerization procedure is said to be particularly effective. Procedure 3-9 is given here only as an illustration of this patented process. 

V-vinylpyrrolidone Alkyl methacrylate Single Tg II had zm alkyl group or m yl or 607,1141... 

Vinylamides such as V-vinylpyrrolidone, 7V-vinylphtalimide and V-vinylformamide undergo, in the presence of (I), stereoselective silylative coupling with various vinylsilanes up to E/Z = 99/1 [17] as well as with octavinylsilsesquioxane [15] (E/Z = 95/5). Extended heating of the reaction mixture allowed exclusive isolation of the -isomer because o( Z -> E isomerization of the products. In contrast to the cross-metathesis with vinyl ethers, no reaction of 7V-vinylpyrrolidinone... 

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