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Viscosity of polystyrene near the glass transition

✍ Scribed by Richard C. Penwell; Roger S. Porter

Publisher
John Wiley and Sons
Year
1969
Tongue
English
Weight
574 KB
Volume
13
Category
Article
ISSN
0021-8995

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✦ Synopsis

A quantitative explanation is given for the apparent viscosity increase with increasing capillary shear rate for polystyrene at temperatures approaching the glass transition, T,.

Possible shifts in T, as a function of the parameters shear rate, frequency, and pressure are interrelated to viscosity changes. Experimentally, the Instron capillary rheometer and the Weissenberg rheogoniometer provided a means for uncoupling the variables for individual consideration. Calculated and experimental data for the apparent viscosity &s a function of the given parameters are presented and discussed. The explanation of the apparent viscosity increase in capillary flow can be quantitatively explained through the pressure dependence of T,. Brief mention is made of the pressure effects on the Bagley and Rabinowitsch corrections normally made in capillary measure ments.

πŸ“œ SIMILAR VOLUMES

Glass Transition of Low-Dimensional Poly
Glass Transition of Low-Dimensional Polystyrene
✍ Qing Jiang; Xing You Lang πŸ“‚ Article πŸ“… 2004 πŸ› John Wiley and Sons 🌐 English βš– 103 KB

## Abstract **Summary:** A unified model is developed for the finite size‐effect on the glass‐transition temperature of polymers, __T__~g~(__D__), where __D__ denotes the diameter of particles or thickness of films. In terms of this model, __T__~g~ depends on both the size and interface conditions.