Application of extrapolation procedures to viscosity data below the theta temperature

J. S. Lindner*, N. Hadjichristidis, J. W. Mays

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

10 Scopus citations

Abstract

Intrinsic viscosities are reported for poly(α-methylstyrene) in cyclohexane from very near the θ temperature (36.2°C) to about 16°C below θ. Six near-monodisperse samples covering the range 5.9 × 104 g mol-1 ≤M̄w≤1.14 × 106 g mol-1 were used for this purpose. Over the investigated range of temperature the Mark-Houwink-Sakurada exponent decreased from 0.498 to 0.386. No signs of aggregation were observed. Various extrapolation procedures, originally advanced for the determination of unperturbed dimensions from viscosity data in moderate and good solvents, were applied to the data. Results indicate that values of Kθ can be accurately determined from viscosity data below θ.

Original languageEnglish (US)
Pages (from-to)174-176
Number of pages3
JournalPolymer communications Guildford
Volume30
Issue number6
StatePublished - Jun 1989
Externally publishedYes

ASJC Scopus subject areas

  • Engineering(all)

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