Feb.4,2021  115  US 2021/0033971 Al  -continued  Q  CYSUy  Mw~7,400  Mw/Mn~ 1.61  -continued  Mw~ 8,100  Mw/Mn~ 1.77  Polymer4  [0193]  Synthesis of Polymer 4  [0194]  A 2-L flask was charged with 0.6 g of Monomer 4,  8.4 g of l-methyl-1-cyclopentyl methacrylate, 3.6 g of  3-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 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  4. Polymer 4 was analyzed for composition by $^{13}$C- and  $^{1}$H-NMR and for Mw and Mw/Mn by GPC.  [0192]  A 2-L flask was charged with 0.5 g of Monomer 3,  8.4 g of l-methyl-1-cyclopentyl methacrylate, 3.6 g of  3-hydroxystyrene, 11.9 g of PAG Monomer 1, 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  3. Polymer 3 was analyzed for composition by $^{13}$C- and  $^{1}$H-NMR and for Mw and Mw/Mn by GPC.  [0191]  Synthesis of Polymer 3  Synthesis Example 4  Synthesis Example 3 