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 language||English (US)|
|Number of pages||3|
|Journal||Polymer communications Guildford|
|State||Published - Jun 1989|
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