weight of the total copolyphosphonate and in other embodiments the phosphorous content of the copolyphosphonates of the invention may be from about 2 to about 12 or about 4 to about 10 by weight of the total polymer the copolyphosphonates of various embodiments exhibit both a high molecular weight and a narrow molecular weight distribution i e low polydispersity as used herein the weight average molecular weight m w divided by the number average molecular weight m n is referred to as the polydispersity pd m w m n for example in some embodiments the copolyphosphonates may have a weight average molecular weight m w of about 10 000 g mole to about 100 000 g mole as determined by u03b7 rel or gpc using polystyrene standards and in other embodiments the copolyphosphonates may have a m w of from about 12 000 to about 80 000 g mole as determined by u03b7 rel or gpc using polystyrene standards the narrow molecular weight distribution i e m w m n of such copolyphosphonates may be from about 2 to about 7 in some embodiments and from about 2 to about 5 in other embodiments in still other embodiments the random copolyphosphonates may have a relative viscosity of from about 1 0 to about 1 75 about 1 1 to about 1 5 about 1 2 to about 1 4 or any value between these exemplary ranges in further embodiments the copolyphosphonate may have a t g of about 25 u00b0 c to about 140 u00b0 c about 50 u00b0 c to about 135 u00b0 c or about 75 u00b0 c to about 130 u00b0 c the random.