O. Karal et al., Effect of a triblock PCL-PDMS-PCL copolymer on the properties of immiscible poly(vinylchloride)/poly(2-ethylhexylacrylate) blends, MACRO CH P, 199(12), 1998, pp. 2699-2708
Miscibility, thermal, mechanical and morphological properties of poly(vinyl
chloride)/poly(2-ethylhexyl acrylate), (PVC/PEHA) blends containing 1-10 w
t.-% of the triblock copolymer polycaprolactone-block-poly(dimethylsiloxane
)-block-(PCL-PDMS-PCL, Tegomer) were investigated by several techniques. Bi
nary blends of PVC/PEHA are found to be immiscible according to differentia
l scanning calorimetry and viscosity measurements. The effect of Tegomer ad
dition on the properties of blends was examined. Ternary blends of PVC/PEHA
/Tegomer exhibited a single T-g behaviour and viscosity measurements indica
te some compatibility. Stress-strain results showed that Tegomer has a syne
rgetic effect on the flexibility of the blends. FTIR analysis confirms the
specific interactions between the components in ternary blends of PVC/PEHA/
Tegomer. Morphological properties of the blends were examined by scanning e
lectron microscopy.