Question

Q1. The following data was reported for the fractionation of a polyester made from sebacic acid and 1,6-hexanediol. (10 marks) Molecular weight range (g/mol) Fractions 8000-16000 16000-24000 24000-32000 32 40000-48000 48000-56000 0.05 0.16 0.24 0.28 0.20 0.07 (I)Draw the structure of the monomers and the polymer. (II)Identify the repeat unit (II) Identify the functionality of the monomers (IV) Evaluate Mn, Mw and the D (V)Calculate the degree of polymerization of the polymer Q2. A polymer mixture is prepared by mixing the following monodisperse samples of polystyrene: 1.0 g of 100 x 103 g/mol, 2.0 g of 250 x 103 g/mol and 1.5g of 750 x 103 g/mol. Calculate the Mn, Mw and D of the resulting mixture (5 marks) Q3. Calculate the number average molecular weight of a poly(butadiene-styrene) copolymer (shown below) with a fraction of 0.30 butadiene repeat units (x) and a fraction of 0.70 acrylonitrile repeat units (y). The degree of polymerization (n) is 2000. (5 marks)

Answer 1