Polymerization Of Vinyl Acetate Using Visible

Pemberton napier college colinton road edinburgh eh10 5dt uk and a.

Polymerization of vinyl acetate using visible.

Johnson university of bradford bradford w. The photoinduced polymerization of vinyl acetate vac proceeded very fast even at 40 c with a catalytic amount of mn2 co 10 0 025 mol of vac or 5 0 mol of r i and completed within a few. Therefore vinyl acetate runaway polymerization incidents are very serious and they occur with a high frequency. Yorkshire bd7 1dp uk received 11 october 1982.

A redox initiating system was developed in order to bypass 2 2 azobis 4 methoxy 2 4 dimethylvaleronitrile v70 as the initiator of the cobalt mediated radical polymerization cmrp of vinyl acetate vac in the presence of cobalt ii acetylacetonate co acac 2. The highly active versatile and photoresponsive controlled living radical polymerizations were developed using mn2 co 10 coupled with an alkyl iodide initiator r i under weak visible light. Eventually the production of vinyl acetate based copolymer latexes in a wide range of molecular particle morphological colloidal physical and film properties can be possible for use in wide variety of applications by change in molecular structure of the comonomer copolymer composition and the emulsion polymerization variables. The amphiphilic pm b pvac diblock copolymers with a series of molecular weights and narrow molecular weight distributions were synthesized successfully.

The polymerization of vinyl acetate was successfully carried out in toluene using pm i as macroinitiator in the presence of mn 2 co 10 under weak visible light at 40 c. Vinyl acetate c4h6o2 cid 7904 structure chemical names physical and chemical properties classification patents literature biological activities safety. Emulsion polymerization has been shown to offer the green synthesis of pvac but it has been. Have reported the polymerization of pvac in bulk using s benzyl o ethyl dithiocarbonate as the madix agent with molecular weights of up to 30 050 g mol 1 although the monomer conversions were incomplete ranging from 68 to 83 conversion.

The polymerization of vinyl acetate is probably the second most frequent cause of runaway reaction accidents in the chemical industry after the phenol formaldehyde runaway reaction. The ethyl eosin ascorbic acid photosensitized polymerization of vinyl acetate in aqueous methanol using visible radiation has been shown to occur by a mechanism in which polymerization occurs after an induction period during which the dye colour fades completely. Carried out the madix solution polymerization of vinyl acetate. Polymerization of vinyl acetate using 1 4 dioxane with near complete monomer conversion 98 20 these articles demonstrate the promise of madix polymerization for pro ducing well defined pvac.

Revised 17 june 1983 the polymerization of vinyl acetate photosensitized by. 19 gois et al.