The teaching of crystalline polymers is one of the most important parts in the syllabus of polymer physics

including massive concepts and theories of polymer crystallization. Tie molecules

as the essential part of crystalline polymers

are not only the link of polymer crystallites

but also the key which helps to understand the structure and property of crystalline polymers. In this work

the crystal models of polymers and the structure-property relationship of crystalline polymers are elaborated

focusing on the effects associated with the tie molecules. In this way

it is much easier for students to understand the structures as well as the corresponding properties of crystalline polymers. Reading literature and recapitulating the recent advances in the field of crystalline polymers are also encouraged to improve the students’ ability of independent thinking.