Abstract
The physical properties of polymer blends and their theoretical consideration based on the double-lattice model (DLM) and a simple rheological equation of state were investigated. Cloud points of poly(ϵ-caprolactone) (PCL)/polystyrene (PS) blends were determined using the thermooptical analysis (t.o.a.) technique. PCL ( M w = 125 000)/PS( M w = 6200) blends exhibit an upper critical solution temperature (UCST). The adjustable parameter values are r 2 = 844.859, ϵ/ k = −313.092 K, and δϵ/ k = 1381.824 K. For PCL ( M w = 15000)/PS ( M w = 840) blends, r 2 = 177.560, ϵ/ k = −254.163 K, and δϵ/ k = 1195.827 K. The DLM successfully describes and predicts the phase behaviour of polymer blends. Steady-state shear viscosity of PCL/linear low-density polyethylene (LLDPE) blends was also investigated. D.s.c. results showed that there is no miscibility between PCL and LLDPE. A simple rheological equation of state successfully describes and predicts the flow behaviour of the proposed polymer blend.
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