Table 1. The Procedure and Method for Post-treatment Process and the Surface-crosslinking.

Type	Procedure	Method
Quenching	Immediately after copolymerization	Poured into the ethanol for 12 hour
Aging	Immediately after copolymerization	Holding temperature for 2 hour
Surface-crosslinking	After drying and classifying	Chemical reaction with surface-crosslinker