Synthesis and Characterization of Copoly(Ether Sulfone)s with Different Percentages of Diphenolic Acid Units

Abstract

New functionalized Poly(ether sulfone)s having different molar ratio (10, 20, 30, 50, 70, 100 mol%) of 4,4-bis phenoxy pentanoic acid unit (diphenolic acid; DPA) units were synthesized and characterized by (1H and 13C)-NMR, MALDI-TOF MS, FT-IR, DSC and DMA analyses. The microstructural analysis of the copolymers, obtained by 13C-NMR using an appropriate statistical model, shows a random distribution of copolymer sequences, as expected. The presence of different amount of DPA units along the polymer chains affects the chemical and physical properties of the copolymers. The Tg and the contact angle values decrease as the molar fraction of DPA units increases, whereas the hydrophilicity increases. NMR and MALDI-TOF MS analyses show that all polymer chains are almost terminated with hydroxyl and chlorine as end groups. The presence of cyclic oligomers was also observed by MALDI-TOF MS analysis.

A Porous Metal–Organic Framework as an Electrochemical Sensing Platform for Highly Selective Adsorption and Detection of Bisphenols

“…To further explore the structure of Zn-L-IPA , Fourier transform infrared spectrometry (FT-IR) and X-ray photoelectron spectroscopy (XPS) characterizations were conducted before and after the introduction of the GP . In the FT-IR spectra (Figure b), the asymmetric and symmetric stretching vibrations for the sulfuryl group were observed at around 1278 and 1175 cm –1 , respectively . The C–H asymmetric and symmetrical stretching of the −CH 2 group appeared at around 2850–3000 cm –1 , and the band at 1500 cm –1 is ascribed to the aromatic ring CC stretching .…”

“…In the FT-IR spectra (Figure b), the asymmetric and symmetric stretching vibrations for the sulfuryl group were observed at around 1278 and 1175 cm –1 , respectively . The C–H asymmetric and symmetrical stretching of the −CH 2 group appeared at around 2850–3000 cm –1 , and the band at 1500 cm –1 is ascribed to the aromatic ring CC stretching . The band at 1598 cm –1 is assignable to the CN stretching vibration of the imidazole of L 1 , which is shifted to 1614 cm –1 for Zn-L-IPA and Zn-L-IPA@GP . , A sharp peak appeared at 578 cm –1 , which arose from the Zn–O bond .…”

“…36 The C−H asymmetric and symmetrical stretching of the −CH 2 group appeared at around 2850−3000 cm −1 , and the band at 1500 cm −1 is ascribed to the aromatic ring CC stretching. 36 The band at 1598 cm −1 is assignable to the CN stretching vibration of the imidazole of L 1 , which is shifted to 1614 cm −1 for Zn-L-IPA and Zn-L-IPA@GP. 37,38 A sharp peak appeared at 578 cm −1 , which arose from the Zn−O bond.…”

Multifunctional Sulfonated Polytriazoles: Proton-Exchange Membrane Properties, Molecular Logic Gates, and Modeling of Stimuli-Responsive Behaviors

“…The symmetric and asymmetric stretching vibrations of the sulfonated groups appeared at 1018 and 1083 cm –1 , respectively . The absorption bands at 1147 and 1316 cm –1 belong to the symmetric and asymmetric stretching of the sulfone unit . In addition, the stretching vibrations of CC bonds (aromatic rings) at 1496 and 1595 cm –1 were observed in the FTIR spectra of the polymers .…”

“…31 The absorption bands at 1147 and 1316 cm −1 belong to the symmetric and asymmetric stretching of the sulfone unit. 32 In addition, the stretching vibrations of C�C bonds (aromatic rings) at 1496 and 1595 cm −1 were observed in the FTIR spectra of the polymers. 33 Hence, these FTIR results indicated the successful inclusion of all monomeric units into the polymers.…”