00519nas a2200121 4500008004100000245009300041210006900134260000800203100001900211700002500230700002400255856011800279 2017 eng d00aPoly(ether urethane)s from aromatic diisocyanates based on lignin-derived phenolic acids0 aPolyether urethanes from aromatic diisocyanates based on lignind cJAN1 aKuhire, Sachin1 aNagane, Samadhan, S.1 aWadgaonkar, Prakash uhttps://library.ncl.res.in/content/polyether-urethanes-aromatic-diisocyanates-based-lignin-derived-phenolic-acids02667nas a2200181 4500008004100000022001400041245016800055210006900223260000900292300001400301490000700315520193500322100002502257700002302282700002602305700002802331856012602359 2019 eng d a1759-995400aPartially bio-based aromatic poly(ether sulfone)s bearing pendant furyl groups: synthesis, characterization and thermo-reversible cross-linking with a bismaleimide0 aPartially biobased aromatic polyether sulfones bearing pendant f cMAR  a1089-10980 v103 a

A fully bio-based bisphenol bearing pendant furyl group, viz., 4,4'-(furan-2-ylmethylene) bis(2-methoxyphenol) (BPF) was synthesized by base-catalyzed condensation of furfural with guaiacol. New partially bio-based (co) poly(ether sulfone) s bearing pendant furyl groups were synthesized via aromatic nucleophilic substitution polycondensation of BPF and various mixtures of BPF and bisphenol-A with bis(4-fluorophenyl) sulfone in N, N-dimethylacetamide as a solvent. (Co) poly(ether sulfone) s showed inherent viscosities in the range 0.92-1.47 dL g(-1) and number average molecular weights ((M-n) over bar), obtained from GPC, were in the range 91 300-131 000 g mol(-1). (Co) poly(ether sulfone) s could be cast into tough, transparent and flexible films from chloroform solutions. (Co)poly(ether sulfone)s showed 10% weight loss in the temperature range 431-481 degrees C and DSC showed T-g in the range 179-190 degrees C. Tensile strength, Young's modulus and elongation at break, obtained from tensile testing of (co) poly(ether sulfone) s containing pendant furyl groups, were in the range 76.7-83.8 MPa, 1.02-1.18 GPa and 21.4-89.7%, respectively. Most interestingly, pendant furyl groups in (co) poly(ether sulfone) s provide reactive sites for click modification and cross-linking via Diels-Alder reaction with maleimides and bismaleimides, respectively. Crosslinked (co) poly(ether sulfone) was prepared via Diels-Alder reaction of a representative (co) poly(ether sulfone) containing pendant furyl groups with 1,1'-(methylenedi-1,4-phenylene) bismaleimide (BMI) at 60 degrees C. The formation of cross-linked poly(ether sulfone) was demonstrated by gelation tests, solubility tests and DSC. The cross-linked copoly(ether sulfone) prepared using BMI showed enhanced tensile strength and Young's modulus compared to parent copoly(ether sulfone) and was recycled two times with retention of mechanical properties.

1 aNagane, Samadhan, S.1 aKuhire, Sachin, S.1 aMane, Shivshankar, R.1 aWadgaonkar, Prakash, P. uhttps://library.ncl.res.in/content/partially-bio-based-aromatic-polyether-sulfones-bearing-pendant-furyl-groups-synthesis02274nas a2200241 4500008004100000022001400041245008500055210006900140260000800209490000700217520146300224653003901687653001401726653001701740653002501757653002501782100002301807700002601830700000501856700002501861700002801886856011801914 2021 eng d a0959-810300aPartially bio-based furyl-functionalized organosoluble poly(ether ether ketone)s0 aPartially biobased furylfunctionalized organosoluble polyether e cAUG0 v703 a

A new series of partially bio-based (co)poly(ether ether ketone)s bearing pendent furyl groups was synthesized by nucleophilic aromatic substitution polycondensation of varying molar proportions of 4,4 `-(furan-2-ylmethylene)bis(2-methoxyphenol) and bisphenol-A with 4,4 `-difluorobenzophenone. The chemical structures, compositions and random nature of (co)poly(ether ether ketone)s were confirmed by NMR spectroscopy. Inherent viscosities and number-average molecular weights of the (co)poly(ether ether ketone)s were in the range 0.74-2.90 dL g(-1) and 33 500-46 300 g mol(-1), respectively, indicating the formation of reasonably high molecular weight polymers. (Co)poly(ether ether ketone)s were readily soluble in common organic solvents and could be cast into tough, transparent and flexible films from chloroform solutions. (Co)poly(ether ether ketone)s exhibited 10% weight loss and glass transition temperatures in the range 429-464 and 152-156 degrees C, respectively. A representative copoly(ether ether ketone) was crosslinked with 1,1 `-(methylenedi-1,4-phenylene)bismaleimide via Diels-Alder reaction to form a crosslinked polymer which showed improved mechanical properties and was recycled twice without significant loss of mechanical properties. Diels-Alder/retro Diels-Alder reaction was demonstrated by studies of sol-gel transformation, solubility tests, DSC and stress-strain measurements. (c) 2020 Society of Chemical Industry

10aaromatic poly(ether ether ketone)s10abio-based10acrosslinking10aDiels-Alder reaction10apendent furyl groups1 aKuhire, Sachin, S.1 aTalanikar, Aniket, A.1 a1 aNagane, Samadhan, S.1 aWadgaonkar, Prakash, P. uhttps://library.ncl.res.in/content/partially-bio-based-furyl-functionalized-organosoluble-polyether-ether-ketones02543nas a2200253 4500008004100000022001400041245012700055210006900182260000800251300001200259490000700271520162900278653002701907653002601934653002401960653002501984653002902009100002502038700002202063700001802085700002602103700002802129856013202157 2022 eng d a1060-132500aPendant propargyloxy-functionalized aromatic (co)polycarbonates: synthesis, thermal crosslinking and chemical modification0 aPendant propargyloxyfunctionalized aromatic copolycarbonates syn cNOV a752-7630 v593 a

A bisphenol monomer bearing pendant propargyloxy group viz, 1, 1-bis (4-hydoxyphenyl)-1-(4 `-propargyloxyphenyl) ethane (BPP) was synthesized starting from commercially available 1, 1, 1-tris (4-hydroxyphenyl) ethane (THPE) by mono O-propargylation reaction using propargyl bromide. A new series of pendant propargyloxy-functionalized aromatic (co)polycarbonates was synthesized by low-temperature solution polycondensation of BPP or different molar ratios of BPP and bisphenol-A with triphosgene in dichloromethane in the presence of triethylamine. The formation of reasonably high molecular weight (co)polycarbonates was confirmed by inherent viscosity (0.52-0.83 dL/g) and gel permeation chromatography (M-n 37,000-69,800 g/mol, polystyrene standards) measurements. C-13 NMR spectral studies supported formation of random copolycarbonates in copolymerization of BPP and BPA with triphosgene. The 10% weight loss temperature (T-10) values of (co)polycarbonates, determined by thermogravimetric analysis under nitrogen atmosphere, were in the range 427-438 degrees C indicating their good thermal stability. The glass transition temperature (T-g) values of (co)polycarbonates were observed in the range 147-152 degrees C. The crosslinking ability of (co)polycarbonates involving pendant propargyloxy groups leading to formation of networked structure was evaluated via non-isothermal curing studies by DSC. As a proof-of-concept, the post-modification of a representative polycarbonate bearing pendant propargyloxy groups with 1-octane thiol as a model compound via thiol-yne click reaction was briefly studied.

10aAromatic polycarbonate10aChemical modification10apropargyloxy groups10athermal crosslinking10athiol-yne click reaction1 aNagane, Samadhan, S.1 aMaher, Deepak, M.1 aVerma, Savita1 aTalanikar, Aniket, A.1 aWadgaonkar, Prakash, P. uhttps://library.ncl.res.in/content/pendant-propargyloxy-functionalized-aromatic-copolycarbonates-synthesis-thermal-crosslinking02784nas 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-norbornenyl