Table 1.

PVA films codes

Sample name	PVA Mw	Citric acid 0.05%
13–23	13,000–23,000	No
13–23 cx	13,000–23,000	Yes
31–50	31,000–50,000	No
31–50 cx	31,000–50,000	Yes
85–124	85,000–124,000	No
85–124 cx	85,000–124,000	Yes