Fig. 6: Two relaxation modes from UPy bond exchange in pendant PDMS network.

a G”(ω) spectra of the fast process observed in Pend-3.5-50/50 at different temperatures (different colors) in which high frequency shoulder shows up. The position of \({\tau }_{{fast}}\) and \({\tau }_{{shoulder}}\) on the spectra measured at 283 K are labeled by arrows. b H(τ) spectra of the fast process observed in Pend-3.5-50/50 at different temperatures (different colors) in which high frequency shoulder shows up. The position of \({\tau }_{{fast}}\) and \({\tau }_{{shoulder}}\) on the spectra measured at 283 K are labeled by arrows. c G’(ω) (open symbol with dotted line), G”(ω) (closed symbol with solid line) spectra of the terminal relaxation process in Pend-3.5-0/100 sample at different temperatures (different colors) in which high frequency shoulder shows up. The position of \({\tau }_{{fast}}\) and \({\tau }_{{shoulder}}\) are labeled by arrows. d Temperature dependance of 2 adjacent relaxation processes (\({\tau }_{{fast}}\): closed symbol; \({\tau }_{{shoulder}}\): open symbol) correlated with UPy bond exchange in both Pend-3.5 (square) and Pend-5.8 (circle) PDMS with different bond ratios (different colors). e Dielectric M”(υ) spectra of Pend-3.5-0/100 at different temperatures (different colors). The position of \({\tau }_{\sigma }\) and \({\tau }_{s}\) are labeled by arrows. f Bond dissociation time with the timescale from high frequency shoulder (Pend-3.5-0/100: red; Pend-5.8-0/100: blue). The solid line represents an assumption that \({\tau }_{s}\) and \({\tau }_{{shoulder}}\) is equal.