Lesson 20　Polycarbonate

Therearefewthermoplasticsthathavetheoutstandingengineeringpropertiesofpolycarbonate.Inrecentyearsithastakenitsplaceamongthemostvaluableresinsoftheindustry.Polycarbonateisamemberofthepolyesterfamilyinthatitcontainscarbonandoxygenatomsasthebackboneofthemole ......（本文共 6280 字 , 2 張圖）     [閱讀本文] >>