【Basic Knowledge of Glossary Definitions for “Polymers and Materials”-028】Glossary definitions related to polymers
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1. Degree of orientation: It is a metric for the degree of orientation of a material, and can generally be represented by the orientation function F. In the formula, q represents the angle between the principal axis of the molecular chain and the orientation direction. 2. Secondary relaxation: Below Tg (for amorphous and poorly crystalline polymers) or Tm (for highly crystalline polymers), the process in which small-scale motion units change from being in a mobile state to a frozen state, or vice versa, is called secondary relaxation. 3. Non-Newtonian index: The n in the power-law formula is the exponent that indicates the degree to which the fluid deviates from Newtonian flow, and is known as the non-Newtonian index.
Is the non-Newtonian index only used for non-Newtonian fluids?