Dielectric analysis of chlorinated polyvinyl chloride stabilized with di‐n‐octyltin maleate

Abstract

Dielectric relaxation of chlorinated polyvinyl chloride stabilized with di-n-octyltin maleate has been studied in the frequency range 1 kHz-1 MHz at various temperatures between 300 and 450 K. A clear dielectric relaxation band (a-type) associated with dipolar polarization has been observed in the studied range. The stabilizer molecules increase the segmental mobility of the polymer, and specific interaction occurs between both the CACl and C¼ ¼O polar groups. The temperature dependence of the relaxation process was analyzed by combining the critical free volume expression by Cohen and Turnbull with the Williams-Landel-Ferry (WLF) model of the thermal expansion of free and occupied volumes.

On the nature of bulk electrical relaxation in 4‑tricyanovinyl-N,N-diethylaniline (TCVA)

“…Consequently the free charges can be accumulated at the inter-phases between these crystal phases close to the electrode. This effect can be assigned to the charge trapping of the interface between these crystal phases and the Maxwell-Wagner-Sillers (MWS) polarization is expected [46]. Similar behavior was obtained from the frequency dependence of the dielectric loss index e 00 (v) of TCVA sample at some fixed temperatures as shown in Fig.…”

Dielectric spectroscopic analysis of polyvinyl chloride nanocomposites loaded with Fe2O3 nanocrystals

“…As the temperature increases, the electric dipoles have sufficient energy to orient themselves easily in the direction of the applied filed. This leads to increase in the polarization of the investigated sample . This significant dependency of ε ′ on temperature has previously been observed for PVC composites .…”

Miscibility Behavior of Poly Ethylene Glycol or Poly Ethylene Succinate/Chlorinated Poly Vinyl Chloride Blends Studied by Dielectric Relaxation Spectroscopy

“…The peak maximum of α-process shows an increase in its magnitude with the increase of temperature as a result of the micro-Brownian motion of CPVC main chains. Moreover, α-relaxation process peak can be ascribed to the release of the frozen-in dipolar C-Cl groups and their cooperative motion with adjoining segments of the main chain [20].…”

“…Three relaxation processes ρ, α', and α are observed at low, middle and higher frequency side respectively. The two α and α'-relaxation processes for pure and blend CPVC samples can be described by the Havrillak Negami (HN) equation [20]: ( ) where ω is the angular frequency, a and b are parameters, which describe the shape of the relaxation time distribution function. τ is the relaxation time, ε* is the complex dielectric permittivity, and Δε = (ε o − ε ∞ ) is the dielectric strength.…”

“…This investigates that the existence of space charges polarization or conduction current relaxation process. For previous study [20] …”