Grafting of poly-pyrrolidone onto copolymer of N-acryloylpyrrolidone and acrylamide

Abstract

Several copolymer of N-acryloylpyrrolidone with acrylamide were prepared in dimethylforamide at $70^\circ C$ Monomer reactivity ratios of N-acryloylpyrrolidone and acrylamide were calculated by intersection method and the linear least-square method developed by Fineman and Ross. $$r_1=0.45\,(\mbox{acrylamide})$$ $$r_2=2.47\,(\mbox{N}-\mbox{acryloylpyrrolidone})$$ It was observed that the copolymer of N-acryloylpyrrolidone and acrylamide have been synthesized back bone chairs with few acyllactam function, randomly distributed. Copolymers of N-acryloylpyrrolidone with acrylamide were used as an initiator of graft copolymerization of pyrrolidone with potassium hydroxide as a catalyst. The highest percent conversion, percent graft and inherent viscosity were determined by the change of concentration. In the case of initiator 5:1(mole ratio of N-acryloylpyrrolidone and acrylamide, respectively) when 3 mole\% of potassium hydroxide the maximum conversion and viscosity were 42\% and 1.2. As the mole ratio N-acrylcylpyrrolidone was increased the conversion and viscosity were also increased. The presence of 18-crown-6 ether led to an increase of the molecular weight of the resulting polymer and the initial rate of polymerization was accelerated by the addition of 18-crown-6 ether.