Steady-shear rheological properties of model compatibilized blends

Autor:	P. Van Puyvelde, Sachin Velankar, Joannes Mewis, Paula Moldenaers
Rok vydání:	2004
Předmět:	chemistry.chemical_classification Materials science Rheometry Mechanical Engineering Relative viscosity Polymer Condensed Matter Physics Viscosity Rheology chemistry Mechanics of Materials Stress relaxation General Materials Science Polymer blend Reduced viscosity Composite material
Zdroj:	Journal of Rheology. 48:725-744
ISSN:	1520-8516 0148-6055
DOI:	10.1122/1.1765662
Popis:	Block copolymers may be added as surface-active compatibilizers in order to control the morphology of blends of immiscible polymers. The effects of such added compatibilizers on the rheological properties of droplet–matrix blends are investigated experimentally. Model blends composed of polyisobutylene (PIB) droplets in a polydimethylsiloxane (PDMS) matrix, compatibilized with a diblock copolymer of PIB and PDMS, are studied here. The viscosity ratio of the blends, i.e., the ratio of the viscosity of the droplets to that of the matrix, is varied from 0.1 to 2.7. The viscosity and the first normal stress difference under steady shear conditions, and complex moduli after cessation of shear are measured. It is found that addition of the compatibilizer slightly raises the magnitude of the terminal complex viscosity of blends at all ratios of viscosity. Furthermore, with addition of the compatibilizer, the terminal relaxation time is found to increase sharply at high viscosity ratios, whereas the steady shear ...
Databáze:	OpenAIRE
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