A thermoreversible conformational change in two poly(zwitterions) evidenced by thermally stimulated depolarization currents

Relaxation dynamics of blends ofPVDFand zwitterionic copolymer by dielectric relaxation spectroscopy

“…As mentioned previously, very few dielectric studies of zwitterionic polymers have been conducted to date. 32,65,66 Since our copolymer contains only 13.4% zwitterionic groups by weight, it is likely any zwitterionic side group motions will be masked by the much broader PMMA β relaxation. Furthermore, the r-ZCP visibly degraded at temperatures above 140 o C, This article is protected by copyright.…”

“…A few dielectric studies have been reported in the literature on zwitterionic polymers or on their interactions in the presence of ions. [30][31][32][33] Rozanski et al investigated a series of methacrylate based polyzwitterions with various side group lengths as well as mixtures of polyzwitterions and inorganic salt. 33 In all samples they observed pronounced conductivity and electrode polarization at high temperatures as seen in ionomers.…”

Influence of the architecture on the molecular mobility of synthetic fragments inspired from human tropoelastin

“…As a matter of fact, it is noteworthy that amyloid fibers, organized in cross spines structures, can be considered as multi interfacial materials [23].Nevertheless the low temperature value of this reverse peak is quite unusual for such a homocharge current peak, generally recorded at higher temperature [24]. TSDC peaks of opposite polarity are also the signature of poly(zwitterions), in which a thermo reversible reaction between low dipole moment species and their conformational isomers of high polarity occurs with relaxation times smaller than the orientational relaxation time [25]. The high temperature TSC thermograms of S4 peptides and S4 fibers are reported in Figure 8.…”