Poly(parabanic acid)s. New aspects of structure–properties relationships

Hydroxyalkylation of parabanic acid. II. Reactions of parabanic acid with oxiranes

“…The rings were introduced into polymer structure by closing them during polymerization of cyanoformamidyl isocyanate, 16,17 in reaction of alkyl disocyanates with bis(oxoamidesters), 18,19 or by modifying certain polymers (e.g., polyureas, with oxalic chloride). [20][21][22] In literature, we have not found any data on reactions of parabanic acid with oxiranes either. One can find information on N-hydroxyalkylation of heterocyclic compounds of similar structure, but other than PA [23][24][25][26][27] (e.g., barbituric acid, uracil, dihydrouracil, hydantoin or derivatives thereof of general formula I) (1) where R ϭ H-, CH 3 -, and with RЈ, RЉ, Rٞ, RٞЈ representing H-, alkyl, cycloalkyl, or substituted phenyl group.…”

Hydroxyalkylation of parabanic acid. I. Reactions with formaldehyde

“…7 The structure and properties of poly(parabanic acid) were recently described. 8 We have found no information on the hydroxyalkylation of parabanic acid. Such a reaction should lead to the respective N,NЈ-bis (hydroxyalkyl) and N,NЈ-bis(hydroxyalkoxyl) derivatives.…”

Oligomers with structural elements of imidazolidinetrione obtained from oxamic acid and oxamide: polyurethane foams modified by structural elements of imidazolidinetrione

“…[10][11][12][13][14][15]. The foams obtained by using products of the urea reaction with EC exhibited the highest density (70-83 kg/ m 3 ) [29].…”

“…Another production method of polymers containing parabanic acid rings is constructing this ring by means of oxalyl chloride, which is incorporated in the structure of polymers such as polyureas [12,13]: (5) where R is the same as R 1 and R 2 in the previous reaction.…”

“…, benzene and naphthalene rings) present in the structure of the abovementioned polymers [7][8][9][10][11][12][13][14][15][16][17][18].…”