@article {45483, title = {Design and synthesis of aromatic polyesters bearing pendant clickable maleimide groups}, journal = {Journal of Polymer Science Part A-Polymer Chemistry}, volume = {57}, year = {2019}, month = {MAR }, pages = {630-640}, type = {Article}, abstract = {

A bisphenol bearing pendant maleimide group, namely, N-maleimidoethyl-3, 3-bis(4-hydroxyphenyl)-1-isobenzopyrrolidone (PPH-MA) was synthesized starting from phenolphthalein. Aromatic (co)polyesters bearing pendant maleimide groups were synthesized from PPH-MA and aromatic diacid chlorides, namely, isophthaloyl chloride (IPC), terephthaloyl chloride (TPC), and 50:50 mol \% mixture of IPC and TPC by low temperature solution polycondensation technique. Copolyesters were also synthesized by polycondensation of different molar proportions of PPH-MA and bisphenol A with IPC. Inherent viscosities and number-average molecular weights of aromatic (co)polyesters were in the range of 0.52-0.97 dL/g and 20,200-32,800 g/mol, respectively indicating formation of medium to reasonably high-molecular-weight polymers. C-13 NMR spectral analysis of copolyesters revealed the formation of random copolymers. The 10\% weight loss temperature of (co)polyesters was found in the range 470-484 degrees C, indicating their good thermal stability. A selected aromatic polyester bearing pendant maleimide groups was chemically modified via thiol-maleimide Michael addition reaction with two representative thiol compounds, namely, 4-chlorothiophenol and 1-adamantanethiol to yield post-modified polymers in a quantitative manner. Additionally, it was demonstrated that polyester containing pendant maleimide groups could be used to form insoluble crosslinked gel in the presence of a multifunctional thiol crosslinker. (c) 2018 Wiley Periodicals, Inc. J. Polym. Sci., Part A: Polym. Chem. 2019, 57, 630-640

}, keywords = {crosslinking, maleimide group, modification, polyesters, thiol-maleimide}, issn = {0887-624X}, doi = {10.1002/pola.29303}, author = {Nagane, Samadhan S. and Kuhire, Sachin S. and Jadhav, Uday A. and Dhanmane, Sushilkumar A. and Wadgaonkar, Prakash P.} } @article {45482, title = {Thermally crosslinkable and chemically modifiable aromatic polyesters possessing pendant propargyloxy groups}, journal = {Journal of Polymer Science Part A-Polymer Chemistry}, volume = {57}, year = {2019}, month = {MAR}, pages = {588-597}, type = {Article}, abstract = {

New aromatic (co)polyesters containing pendant propargyloxy groups were synthesized by phase transfer-catalyzed interfacial polycondensation of 5-(propargyloxy)isophthaloyl chloride (P-IPC) and various compositions of P-IPC and isophthaloyl chloride with bisphenol A. FTIR and NMR spectroscopic data, respectively, revealed successful incorporation of pendant propargyloxy groups into (co)polyesters and formation of (co)polyesters with desired compositions. (Co)polyesters exhibited good solubility in common organic solvents such as chloroform, dichloromethane, and tetrahydrofuran and could be cast into transparent, flexible, and tough films from chloroform solution. Inherent viscosities and number average molecular weights of (co)polyesters were in the range 0.77-1.33 dL/g and 43,600-118,000 g/mol, respectively, indicating the achievement of reasonably high-molecular weights. The 10\% weight loss temperatures of (co)polyesters were in the range 390-420 degrees C, demonstrating their good thermal stability. (Co)polyesters exhibited T-g in the range 146-170 degrees C and T-g values decreased with increase in mol \% incorporation of P-IPC. The study of non-isothermal curing by DSC indicated thermal crosslinking of (co)polyesters via propargyloxy groups. The utility of pendant propargyloxy group was demonstrated by post-modification of the selected copolyester with 1-(4-azidobutyl)pyrene, 9-(azidomethyl)anthracene, and azido-terminated poly(ethyleneglycol) monomethyl ether via copper(I)-catalyzed Huisgen 1,3-dipolar cycloaddition reaction. FTIR and H-1 NMR spectra confirmed that click reaction was quantitative. (c) 2018 Wiley Periodicals, Inc. J. Polym. Sci., Part A: Polym. Chem. 2019, 57, 588-597

}, keywords = {Click chemistry, crosslinking, modification, polyesters, propargyloxy, step-growth polymerization}, issn = {0887-624X}, doi = {10.1002/pola.29297}, author = {Verma, Savita and Maher, Deepak M. and Nagane, Samadhan S. and Tawade, Bhausaheb V. and Wadgaonkar, Prakash P.} } @article {46596, title = {Partially bio-based furyl-functionalized organosoluble poly(ether ether ketone)s}, journal = {Polymer International}, volume = {70}, year = {2021}, month = {AUG}, type = {Article}, abstract = {

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 {\textquoteleft}-(furan-2-ylmethylene)bis(2-methoxyphenol) and bisphenol-A with 4,4 {\textquoteleft}-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 {\textquoteleft}-(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

}, keywords = {aromatic poly(ether ether ketone)s, bio-based, crosslinking, Diels-Alder reaction, pendent furyl groups}, issn = {0959-8103}, doi = {10.1002/pi.6160}, author = {Kuhire, Sachin S. and Talanikar, Aniket A. and Tawade, V, Bhausaheb and Nagane, Samadhan S. and Wadgaonkar, Prakash P.} }