𝔖 Bobbio Scriptorium
✦   LIBER   ✦

Dielectric relaxation of acrylonitrile–butadiene copolymers

✍ Scribed by Ikada, Eiji ;Watanabe, Teizo

Publisher
Wiley (John Wiley & Sons)
Year
1972
Tongue
English
Weight
502 KB
Volume
10
Category
Article
ISSN
0449-296X

No coin nor oath required. For personal study only.

✦ Synopsis

Abstract

Dielectric constants and losses of four kinds of acrylonitrile–butadiene copolymers of different degrees of polymerization were measured in the glass–rubber transition region. Curves of the dielectric losses against frequency showed asymmetric loss curves as often seen in α‐relaxations of polar polymers. The loci of Cole‐Cole plots of the complex dielectric constants of these copolymers fitted well the loci of Havriliak‐Negami's equation,

The distribution parameters (1 − α) and β of the relaxation times were calculated. It is suggested that the mechanism of relaxation of the long chains is governed by a cooperative mechanism consisting of two concurrent motions: the first motion is the segmental relaxation of the polar chains, and the second is the induced motion of the neighboring segments successive to the first one.

📜 SIMILAR VOLUMES

Stress relaxation of reptating chains of
Stress relaxation of reptating chains of acrylonitrile–butadiene copolymer in end-linked acrylonitrile–butadiene copolymer networks
✍ Weilian Liu; Tianbai He 📂 Article 📅 1990 🏛 John Wiley and Sons 🌐 English ⚖ 369 KB 👁 2 views

Stress relaxation of unattached chains of acrylonitrile-butadiene copolymer in TDI end-linked acrylonitrile-butadiene copolymer has been studied. The advantage of this system is that the polar nature of the TDI crosslinking agent in end-linked acrylonitrile-butadiene copolymer can be compensated if

Thermal degradation of copolymers of but
Thermal degradation of copolymers of butadiene and acrylonitrile
✍ N. Grassie; A. Heaney 📂 Article 📅 1974 🏛 Elsevier Science 🌐 English ⚖ 594 KB

Al~traet--Ten copolymers of butadiene and acrylonitrile have been prepared covering the composition range 100-25 mole % butadiene; reactivity ratios are rbu~,d~,,, = 0"50, roc,y~.,it,i~ e = 0"07. The thermal analysis techniques (TVA, TGA and DSC) have been applied to determine the general features o