2-Propenoic acid,2-methyl-, 1,1',1'',1''',1'''',1'''''-[2l5,4l5,6l5-1,3,5,2,4,6-triazatriphosphorine-2,4,6-triylidenehexakis(oxy-2,1-ethanediyl)]ester, homopolymer