Table 7. Swelling Percentage of the PPG Sample 1 in Acidic and Alkaline Media of the BaCl₂·2H₂O Saline Solution.

time (min)	NaOH	HCl
3	94	314
6	117	322
9	144	347
12	159	354
15	178	357
18	195	374
21	226	376
24	241	381
27	250	401
30	273	416
33	444	558
36	473	562
39	477	563
42	483	593
45	493	595
48	494	595
51	500	604
54	522	616
57	532	619
60	534	621
63	666	743
66	666	744
69	670	757
72	674	760
75	680	761
78	683	761
81	687	762
84	699	762
87	702	763
90	703	765