Dielectric relaxations in a series of vinyl aromatic polymers: Poly(2‐vinyl‐N‐ethylcarbazole), poly(3‐vinyl‐N‐ethylcarbazole), poly(2‐vinylanthracene), and poly(α‐methyl‐2‐vinylanthracene)

Abstract

SynopsisTwo dielectric relaxations have been studied on poly(2-vinyl-N-ethylcarbazole) (P2VK) and poly(3-vinyl-N-ethylcarbazole)(P3VK), poly(2-vinylanthracene)(P2VA) and poly(a-methyl-2vinylanthracene)(PMe2VA). The relaxations in P2VK and P3VK occur in the temperature regions 22OOC and -15OOC. Evidence for a third relaxation in both polymers at ca. 12OOC has been found; and, for this reason, the relaxations studied (220°C and -15OOC) are labeled a and 7, respectively, and have been attributed to Tg and carhazole rotational libration about the bond connecting the carbazole moiety to the polymer backbone. Additionally p (ca. 20OC) and y(ca. -15OOC) relaxations in P2VA and MeP2VA have been observed and assigned, respectively, to wagging motion and rotational libration of the pendant anthracene moiety.