Table 1.

Atomic ratio between MPA carboxylic group carbon (O–C=O) and the carbons from the MPA hydrocarbon backbone (C–C) at different take-off angles.

Take-off Angle	–COOH Count	O–C=O Count	–COOH/O–C=O Atomic Ratio
10°	122.20	547.62	0.2231
50°	330.02	1385.55	0.2382
90°	164.08	516.98	0.3174