The ways of modification like chemical ones in the form of co-polymerization, crosslinking, surface modification and so on, and physical ones in the form of blending, plasticization, and so on.

• 改性方法可分为化学改性、物理改性和复合材料改性。化学改性包括共聚、交联、表面修饰等,物理改性包括共混改性、增塑改性等。