02784nas a2200241 4500008004100000022001400041245013400055210006900189260000900258300001100267490000800278520190300286653002902189653001402218653001902232653003102251653002302282100002602305700002502331700002802356700002702384856013102411 2022 eng d a0014-305700aPost-polymerization modifiable aromatic (co)poly(ether sulfone)s possessing pendant norbornenyl groups based upon a new bisphenol0 aPostpolymerization modifiable aromatic copolyether sulfones poss cAUG  a1114310 v1763 a

A new bisphenol possessing pendant norbornenyl group viz., 4, 4 `-(bicyclo (2.2.1) hept-5-en-2 yl methylene) bis (2-methoxyphenol) (BPA-NB) was synthesized by a single-step base-catalyzed condensation reaction of 5-norbor-nene-2-carboxaldehyde with guaiacol. NMR spectral data indicated formation of BPA-NB comprising of isomeric components. A series of (co)poly(ether sulfone)s possessing pendant norbornenyl groups was synthesized by nucleophilic aromatic substitution polycondensation of varying molar ratio of BPA-NB and bisphenol-A (BPA) with bis(4-fluorophenyl) sulfone. Inherent viscosity values and number average molecular weights of (co)poly (ether sulfone)s were in the range 0.67-1.01 dL/g and 75,400-1,16,300 g/mol, respectively indicating the formation of reasonably high molecular weight polymers. Tough, transparent, and flexible films could be cast from chloroform solutions of these (co)poly(ether sulfone)s. (Co)poly(ether sulfone)s were characterized using FT-IR, H-1 NMR and C-13 NMR spectroscopy, XRD, TGA and DSC analysis. The formation of random copoly(ether sulfone)s was demonstrated by( 13)C NMR analysis. The incorporation of BPA-NB into (co)poly(ether sulfone)s resulted into improvement in Tg values. BPA-NB-based (co)poly(ether sulfone)s offered possibilities for post -modifications involving either methoxyl or norbornenyl groups. A representative copoly(ether sulfone) (PSU-NB-2) possessing pendant norbornenyl groups was chemically modified via thiol-ene reaction with three representative thiol compounds, namely, 1-dodecanethiol, 2-furanmethanethiol and 2-mercaptoethanol to yield corresponding post-modified polymers in a quantitative manner. Additionally, it was demonstrated that copoly (ether sulfone) possessing pendant norbornenyl groups could be used to form insoluble cross-linked gel in the presence of a multifunctional thiol cross-linker.

10a(Co)poly(ether sulfone)s10abisphenol10aCross -linking10aPendant norbornenyl groups10aThiol-ene reaction1 aTalanikar, Aniket, A.1 aNagane, Samadhan, S.1 aWadgaonkar, Prakash, P.1 aRashinkar, Gajanan, S. uhttps://library.ncl.res.in/content/post-polymerization-modifiable-aromatic-copolyether-sulfones-possessing-pendant-norbornenyl02313nas a2200229 4500008004100000022001400041245006300055210005800118260000900176300001200185490000700197520155300204653003401757653003201791653002301823653003701846100002601883700002501909700002801934700002701962856009401989 2023 eng d a1060-132500aNorbornenyl-pendant aromatic (co)poly(ether ether ketone)s0 aNorbornenylpendant aromatic copolyether ether ketones cNOV  a790-8000 v603 a

4, 4'-(Bicyclo (2.2.1) hept-5-en-2 yl methylene) bis (2-methoxyphenol) (BPA-NB) was utilized as a step-growth monomer for the synthesis of (co)poly(ether ether ketone)s (PEEK-NBs) via nucleophilic aromatic substitution polycondensation. A homo and five PEEK-NBs were synthesized by polycondensation of 4, 4'-difluorobenzophenone with BPA-NB and various compositions of BPA-NB and bisphenol-A, respectively. H-1 NMR spectroscopy confirmed the chemical structure and composition of PEEK-NBs. Inherent viscosity and number-average molecular weight values of PEEK-NBs were in the range 0.64 to 0.78 dL g(-1) and 62,670 to 84,470 g mol(-1), respectively, indicating the formation of polymers of reasonably high molecular weight. It was easy to dissolve PEEK-NBs in common organic solvents such as chloroform, dichloromethane, and tetrahydrofuran. Tough, transparent, and flexible films of PEEK-NBs could be cast from chloroform solution. X-Ray diffraction studies indicated amorphous nature of PEEK-NBs. Glass transition temperature (T-g) values, determined by DSC analysis, of PEEK-NBs were in the range 163 to190 degrees C and T-g values increased with the increase in mol % of BPA-NB. The post-polymerization modification of a representative PEEK-NB was demonstrated using two azido compounds, namely, 4-(azidomethyl)-7-methoxy-2H-chromen-2-one and 9-(azidomethyl)anthracene, via metal-free azide-alkene 1,3-dipolar cycloaddition reaction to obtain copoly(ether ether ketone)s appended with coumarinyl and anthracenyl moieties, respectively.

10a(Co)poly(ether ether ketone)s10aazide-alkene click reaction10anorbornenyl groups10apost-polymerization modification1 aTalanikar, Aniket, A.1 aNagane, Samadhan, S.1 aWadgaonkar, Prakash, P.1 aRashinkar, Gajanan, S. uhttps://library.ncl.res.in/content/norbornenyl-pendant-aromatic-copolyether-ether-ketones02012nas a2200253 4500008004100000022001400041245013600055210006900191260000900260300001200269490000700281520112100288653002301409653000601432653002401438653002001462653002301482653002401505100002601529700002501555700002801580700002701608856012301635 2024 eng d a1060-132500aAromatic (co)polycarbonates bearing pendant 2,3-dimethylmaleimido group based upon a new phthalimidine-containing "cardo" bisphenol0 aAromatic copolycarbonates bearing pendant 23dimethylmaleimido gr cOCT  a795-8040 v613 a

A new ``cardo'' bisphenol viz., 1-(2-(1,1-bis(4-hydroxyphenyl)-3-oxoisoindolin-2-yl)ethyl)-3,4-dimethyl- 1H-pyrrole-2,5-dione (PPH-MA) was synthesized in a two-step reaction sequence starting from phenolphthalein. PPH-MA was utilized as a step-growth monomer for the synthesis of a homo- and fourco-polycarbonates bearing pendant 2,3-dimethylmaleimido groups (PC-MAs) via solution polycondensation of PPH-MA or various mol % compositions of PPH-MA and bisphenol-A, respectively, with triphosgene.H-1 NMR spectroscopy confirmed the chemical structure and composition of PC-MAs. Inherent viscosity and number average molecular weight values of PC-MAs were in the range 0.45-0.64 dL g(-1) and 18,300 - 36,200 g mol(-1), respectively, indicating the formation of polymers of medium to reasonably high molecular weights. Tough, transparent and flexible films of PC-MAs could be cast from chloroform solution. X-ray diffraction studies indicated the amorphous nature of PC-MAs. The 10% weight loss temperature (T-10) values of PC-MAs were in the range 373-443 degrees C indicating their good thermal stability.

10a(co)polycarbonates10a210a3-dimethylmaleimido10aphenolphthalein10aphthalimidine ring10a``cardo'' bisphenol1 aTalanikar, Aniket, A.1 aNagane, Samadhan, S.1 aWadgaonkar, Prakash, P.1 aRashinkar, Gajanan, S. uhttps://library.ncl.res.in/content/aromatic-copolycarbonates-bearing-pendant-23-dimethylmaleimido-group-based-upon-new01973nas a2200217 4500008004100000022001400041245013300055210006900188260000800257520111800265653002301383653002301406653003701429653003301466653001901499100002601518700002501544700002801569700002701597856013101624 2024 eng d a0954-008300aAromatic (Co)polycarbonates bearing pendant norbornenyl groups: Synthesis, characterization and post-polymerization modification0 aAromatic Copolycarbonates bearing pendant norbornenyl groups Syn cAUG3 a

A homo- and three co-polycarbonates (PC-NBs) bearing pendant norbornenyl groups were synthesized via solution polycondensation of triphosgene with 4, 4'-(bicyclo (2.2.1) hept-5-en-2 yl methylene) bis (2-methoxyphenol) (BPA-NB) or various mol % compositions of BPA-NB and bisphenol-A, respectively. 1H-NMR spectroscopy confirmed the chemical structure and composition of PC-NBs. Inherent viscosity and number-average molecular weight (Mn) values of PC-NBs were in the range 0.44 - 0.64 dL g-1 and 21,800 - 34,100 g mol-1, respectively, indicating the formation of polymers of medium to reasonably high molecular weights. Tough, transparent, and flexible films of PC-NBs could be cast from chloroform solution. X-Ray diffraction studies indicated the amorphous nature of PC-NBs. Glass transition temperature (Tg) values, determined by DSC analysis, of PC-NBs were in the range 154 - 175 degrees C and Tg values increased with the increase in mol % of BPA-NB. The post-polymerization modification of a representative PC-NB was demonstrated using 3,6-diphenyl-1,2,4,5-tetrazine via tetrazine-ene reaction.

10a(co)polycarbonates10anorbornenyl groups10apost-polymerization modification10atetrazine-ene click reaction10athermoplastics1 aTalanikar, Aniket, A.1 aNagane, Samadhan, S.1 aWadgaonkar, Prakash, P.1 aRashinkar, Gajanan, S. uhttps://library.ncl.res.in/content/aromatic-copolycarbonates-bearing-pendant-norbornenyl-groups-synthesis-characterization-and02074nas a2200241 4500008004100000022001400041245009200055210006900147260000800216300001200224490000700236520121300243653002801456653003801484653003301522653002301555100002601578700002101604700002501625700002801650700002701678856012701705 2026 eng d a0954-008300aSynthesis and characterization aromatic copolyesters bearing pendant norbornenyl groups0 aSynthesis and characterization aromatic copolyesters bearing pen cMAY a254-2630 v383 a

4, 4'-(Bicyclo (2.2.1) hept-5-en-2 yl methylene) bis (2-methoxyphenol) (BPA-NB) was polymerized via phase transfer catalyzed interfacial polycondensation with an equimolar mixture (50:50 mol %) of isophthaloyl chloride (IPC) and terephthaloyl chloride (TPC) to obtain aromatic copolyester bearing pendant norbornenyl groups (PES-NB). Furthermore, three different compositions of BPA-NB and bisphenol A (BPA) were polycondensed with IPC to obtain a series of copolyesters. 1H NMR spectroscopy confirmed the chemical structure and compositions of PES-NBs. Inherent viscosity and number-average molecular weight values of PES-NBs were in the range 0.82 to 1.06 dLg-1 and 63,600 to 95,300 gmol-1, respectively, indicating the formation of polymers of reasonably high molecular weights. PES-NBs readily dissolved in common organic solvents such as chloroform, dichloromethane, and tetrahydrofuran, and tough, transparent, flexible films could be cast from their chloroform solutions. X-Ray diffraction studies indicated amorphous nature of PES-NBs. Glass transition temperature (Tg) values of PES-NBs were in the range 215 to 195 degrees C and Tg values increased with the increase in mol % of BPA-NB.

10aaromatic (co)polyesters10aglass-transition temperature (Tg)10ainterfacial polycondensation10anorbornenyl groups1 aTalanikar, Aniket, A.1 aBhong, Sahil, T.1 aNagane, Samadhan, S.1 aWadgaonkar, Prakash, P.1 aRashinkar, Gajanan, S. uhttps://library.ncl.res.in/content/synthesis-and-characterization-aromatic-copolyesters-bearing-pendant-norbornenyl-groups