Subchain Dynamics in Disordered Diblock Copolymer: Poly(isoprene-block-butadiene)

We investigated the dielectric normal mode relaxation on diblock copolymers poly(isoprene-block-butadiene) (I-B) with several polyisoprene (PI)/polybutadiene (PB) compositions. Through the dielectric measurements on I-B, we can obtain information about the dynamics of the PI subchain since the PI bl...

Full description

Saved in:
Bibliographic Details
Published inNihon Reoroji Gakkaishi Vol. 32; no. 4; pp. 189 - 195
Main Authors Urakawa, Osamu, Kido, Masaatsu, Adachi, Keiichiro
Format Journal Article
LanguageEnglish
Published The Society of Rheology, Japan 2004
Subjects
Diblock copolymer
Dielectric relaxation
Polyisoprene
Tube model
Type-A polymer
Online AccessGet full text

Cover

More Information
Summary:We investigated the dielectric normal mode relaxation on diblock copolymers poly(isoprene-block-butadiene) (I-B) with several polyisoprene (PI)/polybutadiene (PB) compositions. Through the dielectric measurements on I-B, we can obtain information about the dynamics of the PI subchain since the PI block is labeled with type-A dipole but PB is not. At the same time, we carried out viscoelastic measurements on the same I-B samples to obtain information of the whole chain motion, especially the longest relaxation times and the plateau moduli. From these viscoelastic and dielectric data, we can directly compare the relaxation spectra of subchains with those predicted by the tube model. From such comparison, we have found that the end part of the chain relaxes faster than the theoretical prediction suggesting extra relaxation mechanisms other than reptation in the dynamics of chain ends.
ISSN:0387-1533
2186-4586
DOI:10.1678/rheology.32.189