Apparent Surface Free Energy of Polymer/Paper Composite Material Treated by Air Plasma

Table 2

The contents of elements on the surface from XPS for the untreated and plasma treated samples.

	Name	% at cont.	% mass cont.
Untreated sample	C 1s	75.3	69.8
	O 1s	23.2	28.6
	N 1s	1.5	1.6
Plasma treated sample	C 1s	69.2	63.0
	O 1s	28.7	34.7
	N 1s	2.2	2.3