Table 2.

Swelling kinetics and diffusion parameters of starch/PAA hydrogels at various pH levels.

Sample	pH	Diffusion parameters		Kinetics parameters
		n	R2	Qe	Qth	kis	R2
S-AA-1	2.0	0.05	0.9515	29.8	33.9	0.001	0.9861
	4.8	0.09	0.9856	77.3	78.4	0.006	0.9979
	7.4	0.20	0.9959	173.0	176.0	0.024	0.9997
	10.0	0.11	0.9900	119.6	119.3	0.016	0.9993
S-AA-2	2.0	0.15	0.9637	129.0	132.1	0.007	0.9933
	4.8	0.15	0.9878	149.5	148.5	0.022	0.9995
	7.4	0.13	0.9617	201.9	194.7	0.030	0.9990
	10.0	0.08	0.9752	163.2	163.5	0.022	0.9978
S-AA-3	2.0	0.06	0.9852	34.7	35.7	0.002	0.9983
	4.8	0.09	0.9973	52.2	51.9	0.008	0.9992
	7.4	0.15	0.9470	194.7	202.8	0.025	0.9991
	10.0	0.16	0.9786	93.2	105.6	0.002	0.9989