【Basic Knowledge of Terminology Explanations for “Polymers and Materials”-008】Terminology explanations related to polymers

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1. Solubility parameter: The square root of the cohesive energy density is generally defined as the solubility parameter d. The closer the solubility parameters of the solute and solvent are, the better they can dissolve each other. 2. Flexibility: The property of polymer chains to continuously change their conformation, or the ability of polymers to curl into random coils. 3. Apparent viscosity: Analogous to the definition of Newtonian viscosity, the viscosity of non-Newtonian fluids is defined as the ratio of shear stress to shear rate, and this value is referred to as apparent viscosity. 4. Chain segment: A segment of a chain composed of several bonds, considered as an independent unit of motion, is called a chain segment. 5. Configuration: Configuration is a description of the relative positions of the nearest-neighbor atoms in a molecule; it refers to the geometric arrangement in space of the atoms in a molecule as determined by chemical bonds.