A new polymer,poly(imino isophthaloyl imino(2,4,8,10-tetraoksoaspiro[5,5]undekan-3,9-dipropylene)) [poly(IPIT)]was synthesized by an interfacial polycondensatio
<正>The number of configurations,c(n,m),of a single chain with length n attached to a flat surface with m monomers contacting the surface is exactly enumerated.