Feb.4,2021  116  US 2021/0033971 Al  -continued  -continued  Mw~ 8,600  Mw/Mn~ 1.71  Mw~ 8,300  Mw/Mn~ 1.56  [0197]  Synthesis of Polymer 6  [0195]  Synthesis of Polymer 5  [0198]  A 2-L flask was charged with 1.5 g of Monomer 5,  8.4 g of l-methyl-1-cyclopentyl methacrylate, 3.4 g of  3-hydroxystyrene, 11.0 g of PAG Monomer 2, and 40 g of  THF solvent. The reactor was cooled at - 70°  C. in nitrogen  atmosphere, after which vacuum pumping and nitrogen  blow were repeated three times. The reactor was warmed up  to room temperature, whereupon 1.2 g of AIBN was added.  The reactor was heated at 60°  C., whereupon reaction ran for  15 hours. The reaction solution was poured into 1 L ofIPA  for precipitation. The precipitated white solid was collected  by filtration and vacuum dried at 60°  C., yielding Polymer  6. Polymer 6 was analyzed for composition by $^{13}$C- and  $^{1}$H-NMR and for Mw and Mw/Mn by GPC.  [0196]  A 2-L flask was charged with 0.8 g of Monomer 1,  8.4 g of l-methyl-1-cyclopentyl methacrylate, 3.6 g of  4-hydroxystyrene, 3.7 g of 3,5-diiodo-4-hydroxystyrene,  12.1 g of PAG Monomer 3, and 40 g of THF solvent. The  reactor was cooled at - 70°  C. in nitrogen atmosphere, after  which vacuum pumping and nitrogen blow were repeated  three times. The reactor was warmed up to room tempera› ture, whereupon 1.2 g of AIBN was added. The reactor was  heated at 60°  C., whereupon reaction ran for 15 hours. The  reaction solution was poured into 1 L of IPA for precipita› tion. The precipitated white solid was collected by filtration  and vacuum dried at 60°  C., yielding Polymer 5. Polymer 5  was analyzed for composition by $^{13}$C- and $^{1}$H-NMR and for  Mw and Mw/Mn by GPC.  1:  o+r  ()  0  0  ND  H  OH  OH  Synthesis Example 6  Synthesis Example 5 