Interfacial tension of PBT/SAN blends by the drop retraction method

• Main Author: Ito, Edson Noriyuki
• Publication Date: 2008
• Other Authors: Ueki, Marcelo Massayoshi, Bretas, Rosario Elida Suman, Hage Junior, Elias
• Format: Article
• Language: eng
• Source: Repositório Institucional da UFRN
• dARK ID: ark:/41046/0013000015hwb
• Download full: https://repositorio.ufrn.br/handle/123456789/37952
• topic: Interfacial tension; Drop retraction method; PBT/SAN blends

The aim of this work was to evaluate the interfacial tension from the poly(butylene terephtalate) and poly(styrene-co-acrylonitrile) (PBT/SAN) interface region using the drop retraction method. SAN filaments were sandwiched between two PBT films; the whole system was heated up to 240 °C, in a hot stage coupled to an optical microscope. The rheological parameters of the PBT/SAN system were obtained by parallel plates rheometry. An increase of the interfacial tension with the PBT molecular weight was observed with values between 0.57 and 1.06 mN/m, depending on the molecular weight. Theoretical values were calculated using the geometric-mean and harmonic-mean equations and were found to be similar to the experimental results. Viscosity measurements showed that the higher the SAN/PBT viscosity ratio, the lower the interfacial tension of these blends