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Fascinating Silicone™ Chemistry Corner – Rheology

Silicone viscosity vs. molecular weight and shear rate

For commonly used shear rates of up to 10,000 s-1 , the viscosity of low-molecular-weight PDMS polymers is essentially constant. For higher-molecular-weight PDMS polymers (>10,000 Da), viscosity remains constant only below a critical shear rate. The critical shear rate decreases with increasing molecular weight. Above the critical shear rate, PDMS polymers exhibit shear thinning where viscosity decreases with increasing shear rate.

Viscosity vs. Shaer Rate

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