Synthesis and physico-chemical properties of copoly(ester-sulfonates) of 1,1′-bis (3-methyl-4-hydroxy phenyl) cyclohexane with 2,4-toluene disulfonyl and terephthaloyl chlorides

Removal of indigo carmine dye from water to Mg–Al–CO3-calcined layered double hydroxides

“…The bands of (C O) at 1641 and 1660 cm −1 separately appear in IC spectra because of intramolecular hydrogen bonding between C O and N-H [23]. After retention, the band at 1660 cm −1 due to intramolecular hydrogen bonding disappears from the spectrum, whereas the band at 1641 cm −1 becomes more intense probably by the forma- [23][24][25][26][27][28]. The displacement of these vibrations indicates that the uptake involved the sulfonate groups of the IC dye.…”

Synthesis and Physicochemical Study of High-Performance Ether-Sulfonate Copolymer

“…DSC thermogram showed glass transition temperature (T g ) at about 170 C. From Figure 6, it is evident that PESAC is thermally stable up to about 290 C and followed single-step degradation involving about 46.7% weight loss over the temperature range from 290-406 C leaving 43.7% residue above 450 C. The maximum weight loss is observed at about 341.2 C. The Tg and thermal stability of PESAC are comparable with other cardo polysulfonates and copolysulfonates of the same type (T g 120-226 C and thermal stability 340-373 C) [7,19,21,[25][26][27][28][29] .…”

“…Moderate tensile strength is due to brittle nature and moderate molecular weight of the copolymer and is comparable with other cardo polysulfonates of different structure (6-60 MPa) containing cyclohexyl as a cardo group [7,[19][20][21] . PESAC possesses better electric strength and volume resistivity as compared to other copolysulfonates of the same type (7-118 kV=mm) and(1 Â 10 14 -2.8 Â 10 17 X cm) [7,19,21] . Excellent electrical properties of PESAC signify its importance as an excellent insulating material.…”

Synthesis and characterization of copolysulfonate of 1,1′-bis(3-methyl-4-hydroxyphenyl)cyclohexane, bisphenol-A, and 4,4′-diphenyl disulfonyl chloride

“…Good electric strength and volume resistivity of CPMCAD may find its usefulness as insulating material for electronic and electrical appliances. [24][25][26]. Thus, CPMCAD possesses good chemical resistance against harsh environmental conditions.…”