Table 1.

Beer-Lambert analysis of the hydroxyl group.

Sample	Thickness (µm)	Absorbance 3411 (cm−1)	Absorbance Coefficient of Hydroxyl group (M−1cm−1)	Hydroxyl Concentration (M/cm3)
As- Spun	124	0.88	75	0.94
As-Cast	83	0.31	75	0.37