Abstract
The effect of diblock copolymer addition on the rheological behavior and on the morphology of a PS/PMMA blend during elongation and after cessation of flow is discussed. The blends' morphology was characterized during deformation and at different stages of the relaxation process. Throughout all experiments, the copolymer concentration was selected to fall either below or above the critical concentration of interface saturation. The results show an unexpected fast relaxation at low copolymer concentration, while a much slower stress relaxation is observed at higher concentrations. Such effects were attributed to the competition between hydrodynamic convection of the copolymer molecules and the Marangoni stresses. The local entanglements of the copolymer chains were found to play a major role in such competing effects.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.