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Viscoelastic properties and interfacial tension of polystyrene–polyethylene blends

✍ Scribed by Nafaa Mekhilef; Pierre J. Carreau; Basil D. Favis; Philippe Martin; Abdelhak Ouhlal

Publisher
John Wiley and Sons
Year
2000
Tongue
English
Weight
234 KB
Volume
38
Category
Article
ISSN
0887-6266

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✦ Synopsis

The linear viscoelastic properties of polystyrene polyethylene (PS/PE) blends have been investigated in the molten state. For concentrations of the dispersed phase equal to 30 vol %, the blends exhibited a droplet-matrix morphology with a volume-average diameter of 5.5 m for a 70/30 PS/PE blend at 200 °C and 14.7 m for a 30/70 PS/PE blend at 230 °C. Enhanced elasticity (GЈ) for both blends, in the terminal zone, compared to the modulus of the matrix (PS and PE, respectively) was observed. This is related to the deformation of the droplets in the matrix phase and hence to the interfacial forces between the blend components. The results for these uncompatibilized blends are shown to be in agreement with the predictions of the emulsion model of Palierne. These predictions were used to obtain the interfacial tension between PS and PE, which was found to be between 2 and 5 mN/m at 200 °C and 4 Ϯ 1 mN/m at 230 °C. Independent interfacial tension measurements using the breaking-thread method resulted in a value of 4.7 mN/m and 4.1 mN/m at 200 °C and 230 °C for the respective blends.

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