The water contact angle (WCA) was measured on non-treated, Plasma, Ox-80, Plasma-CD, and Ox-80-CD samples (Figure ). The surface hydrophilicity was slightly improved by plasma treatment and photo-oxidation, and WCAs decreased from 133° to 122° and 121°, respectively (Table ). The change in WCA by photo-oxidation was minor compared to previous PP films. Interestingly, no decrease in the contact angles was observed for both β-CD support samples, with the Plasma-CD and Ox-80-CD samples at 126° and 130°, respectively. In contrast, the amount of water absorbed by each NWF changed significantly (Table ). Water absorption ability was tested by soaking the samples in distilled water for 10 min. The rate of water absorption was calculated from the difference between the weights before and after soaking (Figure ). The non-treated, Ox-80, and Plasma samples barely absorbed any water, as indicated by the no weight change. In contrast, Ox-80-CD and Plasma-CD got wet throughout fibers in 10 min and absorbed approximately 10 times their original weight in water. This result indicated that the introduction of β-CD improved the water absorbency of the PP NWFs.