@article {46072,
	title = {Aromatic polyesters containing pendant azido groups: synthesis, characterization, chemical modification and thermal cross-linking},
	journal = {European Polymer Journal},
	volume = {116},
	year = {2019},
	month = {JUL},
	pages = {180-189},
	type = {Article},
	abstract = {<p>A partially bio-based bisphenol containing pendant azido group viz., 4,4{\textquoteright}-(5-azidopentane-2,2-diyl) diphenol (AZBPA) was synthesized starting from 4,4{\textquoteright}-bis (4-hydroxyphenyl) pentanoic acid. AZBPA was reacted with isophthaloyl chloride (IPC), terephthaloyl chloride (TPC) and a mixture of IPC/TPC (50:50 mol\%) by phase transfer-catalyzed interfacial polycondensation route to obtain aromatic polyesters containing pendant azido groups. Copolyesters containing pendant azido groups were also synthesized by polycondensation of different molar proportions of AZBPA and commercially available 4,4{\textquoteright}-(1-phenylethane-1,1-diyl) diphenol (BPA-AP) with IPC. Inherent viscosities and number average molecular weights of (co)polyesters were in the range 0.85-1.64 dL/g and 58,900-190,400, respectively, indicating the formation of reasonably high molecular weight polymers. Tough, transparent, and flexible films could be cast from chloroform solutions of these polyesters. X-Ray diffraction analysis showed that (co)polyesters were amorphous in nature. (Co)polyesters were characterized using FT-IR, H-1 NMR spectroscopy, XRD, TGA and DSC analysis. The chemical modification of a representative copolyester containing pendant azido groups was carried out quantitatively using copper-catalyzed azide-alkyne cycloaddition (CuAAC) with two alkynes viz., phenyl acetylene (PA) and ethynyl-4-nitrobenzene (ENB). Additionally, (co)polyesters containing pendant azido groups were thermally cross-linked (170 degrees C/12 h) leading to the formation of network structures based on azide to nitrene decomposition and subsequent reactions on polyester backbone. The selected cross-linked polyesters were characterized by stress-strain measurements. The cross-linked polymers exhibited higher tensile strength and Young{\textquoteright}s modulus and lower \% elongation at break compared to corresponding pristine polyesters containing pendant azido groups.</p>
},
	keywords = {Aromatic polyester, Chemical modification, Click chemistry, Pendant azido group, Thermal cross-linking},
	issn = {0014-3057},
	doi = {10.1016/j.eurpolymj.2019.04.019},
	author = {Nagane, Samadhan S. and Verma, Savita and Tawade, V, Bhausaheb and Sane, Prakash S. 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 = {<p>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</p>},
	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.}
}
