NN-SYNTHESIZE Preparation IN-OF of OSCAR-RN Sulfonated NN-CHEMENTITY Poly(phthalazinone NN ether JJ ether OSCAR-CM ketone -RRB- ) CD-ALPHANUM 7a STOP . TO To DT a CD 25 NN-VOL mL JJ three-necked JJ round-bottomed NN-APPARATUS flask VB-APPARATUS fitted IN-WITH with DT a NN-CHEMENTITY Dean-stark NN trap COMMA , DT a NN-APPARATUS condenser COMMA , DT a OSCAR-CM nitrogen NN inlet/outlet COMMA , CC and JJ magnetic NN-APPARATUS stirrer VBD was VB-ADD added OSCAR-CM bisphthalazinone NN-CHEMENTITY monomer CD-ALPHANUM 4 -LRB- ( CD 0.6267 NN-MASS g COMMA , CD 1 NN-AMOUNT mmol -RRB- ) COMMA , OSCAR-CM sulfonated OSCAR-CM difluoride OSCAR-CM ketone CD-ALPHANUM 5 -LRB- ( CD 0.4223 NN-MASS g COMMA , CD 1 NN-AMOUNT mmol -RRB- ) COMMA , OSCAR-CJ anhydrous OSCAR-CM potassium OSCAR-CM carbonate -LRB- ( CD 0.1935 NN-MASS g COMMA , CD 1.4 NN-AMOUNT mmol -RRB- ) COMMA , CD 5 NN-VOL mL IN-OF of OSCAR-CM DMSO COMMA , CC and CD 6 NN-VOL mL IN-OF of OSCAR-CM toluene STOP . OSCAR-CM Nitrogen VBD was VB-DEGASS purged IN through DT the NN-CHEMENTITY reaction NN-MIXTURE mixture IN-WITH with VB-STIR stirring IN-FOR for CD 10 NN-TIME min COMMA , CC and RB then DT the NN-CHEMENTITY mixture VBD was RB slowly VB-HEAT heated TO to CD 140 NN-TEMP °C CC and VBD kept VB-STIR stirring IN-FOR for CD 2 NN-TIME h STOP . IN-AFTER After OSCAR-CM water VBD generated VBD was VBN azoetroped IN-OFF off IN-WITH with OSCAR-CM toluene STOP . DT The NN-TEMP temperature VBD was RB slowly VB-INCREASE increased TO to CD 175 NN-TEMP °C STOP . DT The NN-TEMP temperature VBD was VB-HEAT maintained IN-FOR for CD 20 NN-TIME h COMMA , CC and DT the JJ viscous NN-CHEMENTITY solution VBD was VB-COOL cooled TO to CD 100 NN-TEMP °C VBN followed IN-BY by VB-ADD diluting IN-WITH with CD 2 NN-VOL mL IN-OF of OSCAR-CM DMSO CC and COMMA , RB thereafter COMMA , VB-PRECIPITATE precipitated IN-INTO into CD 100 NN-VOL mL IN-OF of CD 1 COLON : CD-ALPHANUM 1 -LRB- ( NN v/v -RRB- ) OSCAR-CM methanol DASH / OSCAR-CM water STOP . DT The NN-CHEMENTITY precipitates VBD were VB-FILTER filtered CC and VB-WASH washed IN-WITH with OSCAR-CM water IN-FOR for CD three NN-TIMES times STOP . DT The JJ fibrous NN-CHEMENTITY residues VBD were VB-RECOVER collected CC and VB-DRY dried IN at CD 110 NN-TEMP °C IN-UNDER under NN-VACUUM vacuum IN-FOR for CD 24 NN-TIME h STOP . DT A NN total IN-OF of CD 0.9423 NN-MASS g IN-OF of NN-CHEMENTITY polymer CD-ALPHANUM 7a VBD was VB-YIELD obtained IN-IN in JJ high VB-YIELD yield IN-OF of CD 93 NN-PERCENT % STOP .