Example: barber
Linear Viscoelasticity Linear
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Friction and Wear of Polymers and Composites
ocw.mit.edu• Viscoelasticity Three element model Deformation rate is proportional to the applied load Difficult to determine hardness Sensitive to temperature ... Highly linear Relatively weak inter-molecular force Consequently -- low . Friction and Wear Mechanisms of PTFE • Process 1. Deformation of molecules near the surface due to the
Understanding Rheology of Thermoplastic Polymers
www.tainstruments.comthan that of a corresponding linear polymer of the same molecular weight (Figure 5). The viscosity of long-branched polymers is more shear rate dependent than is the viscosity of linear polymers and long chain branching affects the elasticity of the polymer melts which shows in the normal stress difference and the storage modulus.