A polymer contains 10 molecules with molecular mass 10,000 and 10 molecules with molecular mass 1,00,000 calculate the polydispersity index of the polymer

P.D.I=M¯wM¯mM¯w=∑i=1αNi Mi2∑i=1αNi Mi=10×1042+10×105210×104+10×105=91,818.18M¯m=∑i=1αNi Mi∑i=1αN i=10×104+10×10510+10=55,000∴  PDI=91,818,1855,000=1.669≅1.67