Uniaxial and Biaxial Elongational Flow of Low Density Polyethylene/Polystyrene Blends

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  • 低密度ポリエチレン/ポリスチレン系ブレンドの一軸及び二軸伸長流動

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Uniaxial and biaxial elongational flow behavior of low density polyethylene (LDPE)/polystyrene (PS) blends (LDPE/PS=2/1) with and without 5 wt% styrene-ethylene-propylene block copolymer (SEP) was studied. In these blends, LDPE was the matrix phase and PS was the dispersed phase. Measurements of the uniaxial elongational viscosity η+(t, ε) and the biaxial elongational viscosity ηB+(t, ε) were made using a Meissner-type uniaxial elongational rheometer and a lubricated-squeezing type equibiaxial rheometer, respectively.<BR>In the linear region, the relation between the transient shear viscosity η+(t) and the transient elongational viscosity, which were predicted by 3-dimensional linear Maxwell model, i.e. EE+(t)=3η+(t) and ηB+(t)=6η+(t), did not hold well. This may be attributed to a volumetric resistance against the deformation perpendicular to the elongational direction because of the existence of PS particles. In the long-time region, a difference of ηE+(t, ε) between blends with and without SEP was observed. In the case of uniaxial elongational flow, it may be presumed that a contribution of the deformation of PS domains to the elongational flow behavior has to be taken into account when the elongational strain is large.

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