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.
Highlights
IntroductionEngineering thermoplastic aromatic poly(ether sulfone)s (PES)s show remarkable chemical and thermal stability, excellent strength and flexibility, transparency, as well as high glass transition temperature, good film forming properties, resistance to hydrolysis and oxidation processes, good optical properties, resistance to extreme pH values, and low creep [1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16]
Co-poly(ether sulfone)s bearing active carboxyl acid moiety along the chains (P(ESES-coof DCDPS with different molar ratio of DHDPS and DPA; the polycondensation was carried out ESDPA)) were synthesized via aromatic nucleophilic substitution polymerization of stoichiometric at amount high temperature in NMP/toluene in presence of anhydrous
We report the results of a preliminary study aimed to test selectivity of a (PESES-co-ESDPA) 50:50 membrane towards some cations of heavy metals, such as to the selectivity of a (PESES-co-ESDPA) 50:50 membrane towards some cations of heavy metals, such chromium, vanadium, cadmium, arsenic, mercury, copper, zinc, iron, lead and cobalt
Summary
Engineering thermoplastic aromatic poly(ether sulfone)s (PES)s show remarkable chemical and thermal stability, excellent strength and flexibility, transparency, as well as high glass transition temperature, good film forming properties, resistance to hydrolysis and oxidation processes, good optical properties, resistance to extreme pH values, and low creep [1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16]. The literature reports that a wide range of chemical, mechanical, physical, morphological and thermal characteristics can be obtained by functionalization of the made PESs or varying the structure of the monomer units in the copolymers synthesized [16,17,18,19,20,21,22,23,24,25,26]. Due to their antimicrobial action, solubility and Polymers 2020, 12, 1817; doi:10.3390/polym12081817 www.mdpi.com/journal/polymers
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