Compression creep of molten poly (butylene terephthalate)

Sanchez-Sancha, M.; Alemán, José V.

doi:10.1007/bf01337459

Cited by 4 publications

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Compression creep of molten polystyrene

Alemán

1990

Angew. Makromol. Chem.

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Viscoelastic parameters of polystyrene (PS) melt in compression creep have been measured in an lnstron capillary‐rheometer. Bulk compression creep compliance B(t) shows plateau regions in the molten state (B1) and the glassy state (Bg), both decreasing with increasing stress. Shifting of B(t) curves provides master curves suitable to analysing the total (superposed elastic and viscous deformations) bulk compression behaviour. The steady‐state creep compliance (Bs) allows to describe the recoverable elastic energy (Be) and seems to be related to the extrusion die swell (B cs/B ds). Volume viscosity (ηk) decreases with decreasing stress (P), increasing compression rates (k) and decreasing temperature (T).

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Compression creep of molten polystyrene

Alemán

1990

Angew. Makromol. Chem.

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Compression Creep of Molten Polymers

Alemán

1990

Third European Rheology Conference and Golden Jubilee Meeting of the British Society of Rheology

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SUMMARYViscoelastic parameters of polystyrene (PS) melt in compression creep have been measured in an Instron capillary-rheometer.Bulk compression creep compliance B(t) shows plateau regions in the molten state (B,) and the glassy state (BJ, both decreasing with increasing stress. Shifting of B(t) curves provides master curves suitable to analysing the total (superposed elastic and viscous deformations) bulk compression behaviour. The steady-state creep compliance (BS) allows to describe the recoverable elastic energy (Be) and seems to be related to the extrusion die swell (BE/B$). Volume viscosity (qk) decreases with decreasing stress (P), increasing compression rates (k) and decreasing temperature (T). ZUSAMMENFASSUNG:Die Viskoelastizitats-Parameter von geschmolzenem Polystyrol (PS) wurden rnit einem Instron-Kapillarrheometer gemessen.Die Drucknachgiebigkeit B(t) zeigt ein Plateau sowohl im Schmelze (BJ-als auch im Glaszustand (BJ; beide nehmen mit abnehmender Spannung ab. Durch Verschiebung der B(t)-Kurven werden Master-Kurven erhalten, mit denen das Gesamtdruckverhalten (iiberlagerte elastische und viskose Deformationen) analysiert werden kann. Die stationare Nachgiebigkeit (BS) erlaubt eine Beschreibung des elastischen Energieanteils und scheint rnit der Extrusions-Strangaufweitung (B"J$) korreliert zu sein. Die Volumenviskositat (qK) nimmt mit zunehmender Spannung (P), zunehmender Belastungsgeschwindigkeit (k) und abnehmender Temperatur ab.

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