When teaching course of "The Structure and properties of Polymers"

it is important to lay stress on the characteristics of polymers.The paper presents much discussion on characteristics of polymers

such as flexibility of macromolecular chain

unique entropy elasticity and notable viscoelasticity of polymer materials

peculiar WLF equation

possible orientation of large scale motion unit and dis-orientation of small scale motion unit

crazing

single-chain condensed state

folded lamellar crystals and macroscopic single polymer crystals with stretched chain

multi-distribution of molecular weight

properties of polymer solution and elasticity of polymer melts.