As a material of high tensil strength, tear and wear resistense, PUR are widely used in many fields such as agriculture, industry and medicine etc. This paper introduced the history of PUR, and its applications.Some new types of PUR are also reviewed.

This essay discussed the methods of training chemistry teachers’ aesthetic appreciation from constructing chemistry teacher’ ability of aesthetic judgement, which based on Study on Aesthetic Appreciation Education for Chemistry Teachers(Ⅰ),(Ⅱ).