Oxidation State of a Polyurethane Membrane after Plasma Etching

Table 2

Chemical groups and environments present in the derived structure of Chronoflex PU. The underscored atom shown in the group column is the contributing chemical environment of that row.

Chemical environment	Instances	Area ratio	Group	Binding energy (eV)	Reference
Carbon
1	21	21/32	C–C	285.0	[6, 14]
2	3	3/32	C–O–C=O	286.6	[6]
3	2	1/16	O=C(–O)–N	287.9–289.4	[6, 15]
4	1	1/32	O=C(–O)–O	290.35–290.44	[6]
5	2	1/16	N–Chex	285.5–286.4	[6]
6	3	3/32	C–O–R	286.1–286.75; 286.4–286.8	[6]; [14]
Total	32	1
Nitrogen
1	1	1	O=C–N–C	399.9–400.2	[6]
Oxygen
1	2	2/7	O–C(=O)–N	531.3–532.4	[6]
2	2	2/7	O–C(=O)–N	533.2–533.9; 533.5–533.7	[6]; [14]
3	1	1/7	C–O–C(=O)–O	532.3-532.4; 532.0–532.3	[6]; [14]
4	2	2/7	O–C(=O)–O	533.8–534.0; 533.5–533.9	[6]; [14]
—	—	—	C–O–H	532.8–533.1; 532.7–533.1	[6]; [14]
Total	7	1