Uniaxial drawing of poly(ethyleneoxide)/poly(methyl methacrylate) blends by solid‐state extrusion

Ultradrawn ribbons of solution‐cast blends of poly(ethylene oxide) (PEO)/poly(methyl methacrylate) (PMMA) have been prepared by a solid‐state coextrusion in a capillary rheometer. An increase of noncrystallizable PMMA in the blends drastically decreased the drawability from a draw ratio of 36 for pure PEO to 5 for a mixture of PEO/PMMA 40/60% by weight. A low crystallinity and depression of melting temperature for PEO were observed with increasing draw. The Flory‐Huggins theory for melting temperature depression has been used to derive the binary interaction parameter for these blends.