Rheological behavior of compatible polymer blends. I. Blends of poly(styrene-Co-acrylonitrile) and poly(ε-caprolactone)

✍ Scribed by Chang Dae Han; Heng-Huey Yang

• Publisher: John Wiley and Sons
• Year: 1987
• Tongue: English
• Weight: 980 KB
• Volume: 33
• Category: Article
• ISSN: 0021-8995
• DOI: 10.1002/app.1987.070330412

✦ Synopsis

The rheological behavior of blends of poly(styrene-co-acrylonitrile) (SAN) and poly( c-caprolactone) (PCL) was investigated, using a cone-and-plate rheometer. For the study, blends of various compositions were prepared by melt blending using a twin-screw compounding machine. The rheological properties measured were shear stress (uI2), viscosity (q), and first, normal stress difference ( N l ) as functions of shear rate (i.) in steady shearing flow, and dynamic storage modulus (12') and loss modulus (G") as functions of angular frequency (a) in oscillatory shearing flow, a t various temperatures. It has been found that logarithmic plots of iVl versus uI2, and logarithmic plots of G' versus G", become ozrtuaZZy independent of temperature but vary regularly with blend composition, and that the zero-shear viscosity of the blends, ( qo)blendr follows the relationship, l/log(qo)bl,,d = wA/log qoA + wE/log qoB, where qoa and qoE are the zero-shear viscosities of components A and .B, respectively, and wA and w, are the weight fractions of components A and B, respectively. The physical implications of the relationship found are discussed.