161  US 9,360,75 3  82  -continued  Polymer 12  Mw~7,800  Mw/Mn~ 1.68  Polymer 14  Mw~7,300  Mw/Mn~ 1.63  Polymer 13  Mw~7,300  Mw/Mn~l.63  ~  r  0  0  Polymer 13  r  I  ¢ 0  0  ~  ~  a  I  ✓,;:;  ~  OH  r  0  0  Polymer 15 