Breakdown of time-temperature superposition in miscible polymer blends

Research output: Contribution to journalConference article

11 Citations (Scopus)

Abstract

The authors demonstrate that time-temperature superposition is in fact invalid for a miscible blend of poly(ethylene oxide) and poly(methyl methacrylate). This blend is a model blend system in two respects. Both polymers can be prepared with narrow molecular weight distributions by anionic polymerization. This represents a major advantage over the blends of polydisperse polymers used in previous rheological studies, as the relaxation of each component is obvious in blends of nearly monodisperse polymers. The enthalpy of mixing for these polymers, reflected in the Flory-Huggins interaction parameter, is negative, but indistinguishable from zero within experimental error. Thus the blend is miscible, but free from strong specific interactions between the components, which might complicate the blend rheology.

Original languageEnglish (US)
Pages (from-to)52-53
Number of pages2
JournalAmerican Chemical Society, Polymer Preprints, Division of Polymer Chemistry
Volume30
Issue number1
StatePublished - Apr 1 1989
EventPapers Presented at the Dallas, Texas Meeting - Dallas, TX, USA
Duration: Apr 9 1989Apr 14 1989

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Polymer blends
Polymers
Temperature
Anionic polymerization
Polymethyl Methacrylate
Molecular weight distribution
Polyethylene oxides
Polymethyl methacrylates
Rheology
Enthalpy

All Science Journal Classification (ASJC) codes

  • Polymers and Plastics

Cite this

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Breakdown of time-temperature superposition in miscible polymer blends. / Colby, Ralph H.

In: American Chemical Society, Polymer Preprints, Division of Polymer Chemistry, Vol. 30, No. 1, 01.04.1989, p. 52-53.

Research output: Contribution to journalConference article

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N2 - The authors demonstrate that time-temperature superposition is in fact invalid for a miscible blend of poly(ethylene oxide) and poly(methyl methacrylate). This blend is a model blend system in two respects. Both polymers can be prepared with narrow molecular weight distributions by anionic polymerization. This represents a major advantage over the blends of polydisperse polymers used in previous rheological studies, as the relaxation of each component is obvious in blends of nearly monodisperse polymers. The enthalpy of mixing for these polymers, reflected in the Flory-Huggins interaction parameter, is negative, but indistinguishable from zero within experimental error. Thus the blend is miscible, but free from strong specific interactions between the components, which might complicate the blend rheology.

AB - The authors demonstrate that time-temperature superposition is in fact invalid for a miscible blend of poly(ethylene oxide) and poly(methyl methacrylate). This blend is a model blend system in two respects. Both polymers can be prepared with narrow molecular weight distributions by anionic polymerization. This represents a major advantage over the blends of polydisperse polymers used in previous rheological studies, as the relaxation of each component is obvious in blends of nearly monodisperse polymers. The enthalpy of mixing for these polymers, reflected in the Flory-Huggins interaction parameter, is negative, but indistinguishable from zero within experimental error. Thus the blend is miscible, but free from strong specific interactions between the components, which might complicate the blend rheology.

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