Study of Swelling Properties and Thermal Behavior of Poly(N,N-Dimethylacrylamide-co-Maleic Acid) Based Hydrogels

Table 2

(a) Equilibrium swelling ratios of P(DMA-MAx) hydrogels with different MA contents at different pH media. (b) Equilibrium swelling ratios of P(DMA-MA8) hydrogels with different NMBA contents at different pH media.

(a)

Hydrogels	Equilibrium swelling ratio (%)
	pH = 0.9	pH = 3.9	pH = 6.9	pH = 8.7
PDMA	833	831	852	844
P(DMA-MA8)	870	901	1084	1526
P(DMA-MA15)	1200	1391	1448	3173
P(DMA-MA29)	1700	1836	2204	3799
P(DMA-MA33)	1900	2034	2699	4556
P(DMA-MA38)	2111	2514	3002	6961

(b)

Composition of NMBA (mol%)	Equilibrium swelling ratio (%)
	pH = 0.9	pH = 3.9	pH = 6.9	pH = 8.7
0.16	1401	1535	1754	2637
0.32	870	901	1084	1526
0.48	685	781	1008	1436
0.64	600	697	938	1356
1.28	508	605	860	1288