Figure 8: Normalized absorbance intensity due to hydroxyl groups (3400 cm−1) in FTIR ATR spectra of UHMWPE as a function of time of storage after PIII treatment. The time of storage under water is shown annotated in the figure. When the sample is taken from water, the adsorbed water in gives a contribution in the intensity of (OH) line. After 30–40 mins the water evaporates.