Jul.  30,  2020  125  US 2020/0241418 Al  -continued  Mw~ 10,300  Mw/Mn~ 1.58  Polymer4  0  0  {)  r  0  0  F2  0  C  Y’s03- 0  CF3  Mw/Mn~ 1.59  [0181]  Synthesis of Polymer 5  [0182]  A 2-L flask was charged with 3.5 g of Monomer 5,  8.4 g of l-methyl-1-cyclopentyl methacrylate, 3.6 g of  3-hydroxystyrene, 11.0 g of PAG Monomer 2, and 40 g of  THF as 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 of isopropyl alcohol for precipitation. The precipi› tated 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.  [0179]  Synthesis of Polymer 4  [0180]  A 2-L flask was charged with 3.7 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 as 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 of isopropyl alcohol for precipitation. The precipi› tated 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.  Synthesis Example 2-5  Synthesis Example 2-4 