Jul.  30, 2020  127  US 2020/0241418 Al  Mw~9,800  Mw/Mn~ 1.79  Polymer 8  r  0  0  r  0  0  {)  Mw~ 10,800  Mw/Mn~ 1.59  Polymer 7  [0189]  Synthesis of Polymer 9  [0187]  Synthesis of Polymer 8  [0188]  A 2-L flask was charged with 6.1 g of Monomer 8,  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 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 8. Polymer 8 was analyzed  for composition by $^{13}$C- and $^{1}$H-NMR and for Mw and  Mw/Mn by GPC.  [0190]  A 2-L flask was charged with 5.5 g of Monomer 9,  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 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 9. Polymer 9 was analyzed  for composition by $^{13}$C- and $^{1}$H-NMR and for Mw and  Mw/Mn by GPC.  Synthesis Example 2-9  Synthesis Example 2-8 