
 Thefirsteffortsofmanufacturingartificialfiberswereconnectedwiththeattemptstoutilizenaturalpolymers,primarilycelluloseandcasein,asrawmaterials.Althoughsyntheticpolymerswerealreadyknownatthattime,theywereconsideredmerelyascuriosawithoututilitarianvalue.Macr (共 9916 字) [阅读本文] >>


说明: 本文档由创作者上传发布,版权归属创作者。若内容存在侵权,请点击