Dynamics of disordered diblocks of polyisoprene and polyvinylethylene

B. H. Arendt, R. Krishnamoorti, Kannan Rangaramanujam, K. Seitz, J. A. Kornfield, J. Roovers

Research output: Contribution to journalArticle

Abstract

The apparent thermorheological simplicity of disordered diblocks is reconciled with the failure of time-temperature superposition of corresponding miscible blends by examining the relaxation of the constituent blocks using rheo-optical techniques. Diblocks of 1,4-polyisoprene (PIP) and polyvinylethylene (PVE) are examined over a range of temperatures for two compositions (φPIP = 0.25 and 0.75). Unlike blends of PIP and PVE, the block copolymers appear to obey time-temperature superposition on the basis of their viscoelastic properties. However, departure from thermorheological simplicity is exposed in their stress-optical behavior. In particular, the copolymer rich in the high Tg component (φPIP = 0.25) shows distinct temperature dependencies for the individual blocks, in accord with the behavior of PIP/PVE blends. The block copolymer rich in the low Tg component (φPIP = 0.75) is thermorheologically simple because both blocks have similar monomeric friction coefficients ζo,PVE ≈ ζo,PIP, again in accord with prior results on PIP/PVE blends. The failure of time-temperature superposition in these diblocks was not previously observed because the change in ζo,PVEo,PIP with temperature produces subtle changes in the overall relaxation spectrum relative to a linear chain of uniform friction.

Original languageEnglish (US)
Pages (from-to)1138-1145
Number of pages8
JournalMacromolecules
Volume30
Issue number4
StatePublished - Feb 24 1997
Externally publishedYes

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Polyisoprenes
Temperature
Block copolymers
Friction
1,4-polyisoprene
Copolymers

ASJC Scopus subject areas

  • Materials Chemistry

Cite this

Arendt, B. H., Krishnamoorti, R., Rangaramanujam, K., Seitz, K., Kornfield, J. A., & Roovers, J. (1997). Dynamics of disordered diblocks of polyisoprene and polyvinylethylene. Macromolecules, 30(4), 1138-1145.

Dynamics of disordered diblocks of polyisoprene and polyvinylethylene. / Arendt, B. H.; Krishnamoorti, R.; Rangaramanujam, Kannan; Seitz, K.; Kornfield, J. A.; Roovers, J.

In: Macromolecules, Vol. 30, No. 4, 24.02.1997, p. 1138-1145.

Research output: Contribution to journalArticle

Arendt, BH, Krishnamoorti, R, Rangaramanujam, K, Seitz, K, Kornfield, JA & Roovers, J 1997, 'Dynamics of disordered diblocks of polyisoprene and polyvinylethylene', Macromolecules, vol. 30, no. 4, pp. 1138-1145.
Arendt BH, Krishnamoorti R, Rangaramanujam K, Seitz K, Kornfield JA, Roovers J. Dynamics of disordered diblocks of polyisoprene and polyvinylethylene. Macromolecules. 1997 Feb 24;30(4):1138-1145.
Arendt, B. H. ; Krishnamoorti, R. ; Rangaramanujam, Kannan ; Seitz, K. ; Kornfield, J. A. ; Roovers, J. / Dynamics of disordered diblocks of polyisoprene and polyvinylethylene. In: Macromolecules. 1997 ; Vol. 30, No. 4. pp. 1138-1145.
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