Phenol containing vinyl monomers, radical polymerization

The net result is a decrease in initiator efficiency and an attendant increase in polymer molecular weight. In fact, all of our work on radical polymerization of phenol-containing vinyl monomers suggests that inhibition and transfer problems are at most minor, if AIBN is used as initiator and oxygen is carefully excluded from the reaction mixtures (9). 

The Choice of a Matrix Resin. As was mentioned earlier, the common matrix resins for today s lithography are phenolic resins such as Novolac and poly(4-hydroxystyrene). Though some of our early work had involved simple water soluble alcohols such as poly(vinyl alcohol), schemes for their reversible in situ insolubilization were sometimes complicated by irreversible processes or side-reactions. As a result we chose to test the water-soluble linear polymer that is obtained by free-radical polymerization of 2-isopropenyl-2-oxazoline, 1. Monomer 1 can be polymerized through a variety of techniques, as shown in Scheme 1 (6,7). Both radical or anionic polymerization conditions lead to a polymer containing pendant oxazoline rings, while a more complex structure is obtained under cationic conditions as both the vinyl and the oxazoline moieties are reactive. 

More examples have been quoted of special growth reactions for molecules having two carbon-carbon double bonds. Cyclopolymerization occurs for diallylaminomethyl phenols, allyl esters of unsaturated acids, 2-(2-vinyl-phenoxy)ethyl methacrylate and acrylate, 2-divinylbenzene and some silicon-containing monomers. - Polymerizations of p-xylylene and its derivatives have been considered further. - The radical polymmzation of some disubstituted vinylcyclopropanes has been represented as shown in equation (2), where X and Y=CN or COjEt. The involvement of the ring must be connected with stabilization by the substituents of the product radical. 

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