Abstract
Polyethersulfone with active carboxylic acid pendants was prepared from solution polymerization via nucleophilic displacement polycondensation reaction among 4,4′-dichlorodiphenyl sulfone (DCDPS) and 4,4′-bis(4-hydroxyphenyl) valeric acid (BHPA). The conditions necessary to synthesize and purify the polymer were investigated in some details. The synthesized polyethersulfone comprises sulfone and ether linkages in addition to reactive carboxylic acid functionality; this reactive carboxylic acid group was exploited to hold the HEPES moiety via ester linkage and is achieved by simple DCC coupling condition at ambient temperature. Without impairing the primary polymeric backbone, three modified polymers were prepared by varying the stoichiometric ratio of HEPES. Characterization of the polymers by 1H & 13C NMR, FT-IR, and TGA demonstrated that HEPES was quantitatively incorporated into the prime polymer. All the prepared polymers were pressed into tablets, and electrical contacts were established to study the dielectric properties. Finally, the influence of the HEPES on the dielectric properties was examined.
Highlights
The field of ionomers has expanded over the past few decades and has become fundamental to the science of polymer technology; the intriguing properties and the wide range technological interests have been an ever increasing stimulus to fully focus on specialized applications such as electrochemical sensors [1, 2], polymer electrolyte fuel cells (PEMFCs) [3,4,5]
The synthesis of new polymer Valeric Acid-Based Polyethersulfone (VALPSU) with active carboxylic acid moiety was achieved via conventional aromatic nucleophilic substitution polymerization technique from 4,4-Bis(4-hydroxyphenyl) valeric acid and 4,4-Dichlorodiphenyl sulfone; the polycondensation was carried out at an elevated temperature in NMP/Toluene azeotrope in presence of anhydrous pulverised potassium carbonate
The FTIR and NMR (1H & 13C) spectra of VALPSU and HEPES-modified VALPSU were shown in Samples P-00 P-20 P-40 P-60
Summary
The field of ionomers has expanded over the past few decades and has become fundamental to the science of polymer technology; the intriguing properties and the wide range technological interests have been an ever increasing stimulus to fully focus on specialized applications such as electrochemical sensors [1, 2], polymer electrolyte fuel cells (PEMFCs) [3,4,5]. There have been a multitude of new simple synthetic methodologies developed to aid in the construction of high performance polymers with suitable ionic groups [6]. With these developments, the field of ionomers has matured within the last few decades; the richness of physical and chemical properties of these polymers finds its fundamental and potential response to technical field. Metal incorporated monomers are used to synthesize the electrically conductive polysulfone [18, 19] and have been extensively investigated for their potential applications in the field of fuel cells [20, 21]
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
