 Polyether and polycarbonate, PC, glycols, 4, for diphylmethane disocyanate, 1, 1 methylenivus, for isocyanatobenzene, 1, for butaneveol and poly, oxytetramethylene, glycol, PTNG, and PTNG incorporating dimethyl groups, PEGX, and methylsi groups, PEGL, were used to create polyurethane elastomers, PEs. Poly, oxytetramethylene, glycol, PTNG, and PTNG incorporating dimethyl groups, PEGX, and methylsi groups, PEGL, were also used to create polycarbonate glycol, PC glycol, random copolymers with hexamethylene, C6, and tetramethylene, C4, units between carbonate groups with various composition ratios, C4 slash C6 equals 0 slash 100, 50 50ths, 70 30ths, and this article was authored by Sadahara Nakamura, Matsuhisa Furukawa, Ken Kojio, and others. We are article.tv, links in the description below.