【Basic Knowledge of Glossary Explanations for “Polymers and Materials”-019】Glossary explanations related to polymers

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1. When u=0, the behavior of the soliton is similar to that of an infinitely thin chain, in a perturbation-free state; the size of this state is called the perturbation-free size. 2. Swelling factor: The ratio of the mean square end-to-end distance of the polymer chains to the mean square rotational radius when T>θ, to the values of h0 and S0 at θ. 3. Second virial coefficient: A measure of the interactions between polymer chain segments as well as between the polymer and solvent molecules. 4. Relaxation process: Under certain external conditions, polymers transition from one equilibrium state to a new equilibrium state that is suitable for those conditions, through molecular thermal motion. Since the friction force acting on the moving units during this motion is generally quite large, this process is usually carried out slowly; it is referred to as the relaxation process. 5. Perturbation-free size: Under special circumstances, the positive external repulsive volume and the negative internal repulsive volume exactly cancel each other out