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

Table 3

(a) Swelling kinetic coefficients of P(DMA-MAx) hydrogels with different MA contents at different pH media. (b) Swelling kinetic coefficients of P(DMA-MA8) hydrogels with different NMBA contents at different pH media.

(a)

Medium	Hydrogels	𝑅^2	𝑛	ln𝑘
pH = 0.9	PDMA	0.9997	0.576	−3.428
	P(DMA-MA8)	0.9996	0.487	−3.142
	P(DMA-MA15)	0.9996	0.486	−3.405
	P(DMA-MA29)	0.9984	0.636	−4.912
	P(DMA-MA33)	0.9969	0.684	−4.760
	P(DMA-MA38)	0.9991	0.584	−4.174
pH = 3.9	PDMA	0.9998	0.594	−3.997
	P(DMA-MA8)	0.9993	0.582	−3.762
	P(DMA-MA15)	0.9989	0.586	−4.209
	P(DMA-MA29)	0.9978	0.685	−5.263
	P(DMA-MA33)	0.9986	0.768	−5.242
	P(DMA-MA38)	0.9992	0.661	−4.615
pH = 6.9	PDMA	0.9997	0.559	−3.883
	P(DMA-MA8)	0.9975	0.553	−3.858
	P(DMA-MA15)	0.9985	0.582	−4.293
	P(DMA-MA29)	0.9990	0.553	−3.782
	P(DMA-MA33)	0.9968	0.661	−5.075
	P(DMA-MA38)	0.9980	0.650	−4.648
pH = 8.7	PDMA	0.9991	0.553	−3.819
	P(DMA-MA8)	0.9991	0.564	−3.711
	P(DMA-MA15)	0.9988	0.668	−4.748
	P(DMA-MA29)	0.9991	0.738	−5.745
	P(DMA-MA33)	0.9991	0.734	−5.680
	P(DMA-MA38)	0.9981	0.796	−5.316

(b)

Medium	Composition of NMBA (mol%)	𝑅^2	𝑛	ln𝑘
pH = 0.9	0.16	0.9976	0.651	−4.617
	0.32	0.9996	0.487	−3.142
	0.48	0.9976	0.553	−3.665
	0.64	0.9964	0.564	−4.021
	1.28	0.9979	0.523	−3.555
pH = 3.9	0.16	0.9977	0.586	−4.675
	0.32	0.9993	0.582	−3.762
	0.48	0.9981	0.589	−4.081
	0.64	0.9985	0.575	−4.064
	1.28	0.9968	0.608	−4.410
pH = 6.9	0.16	0.9997	0.606	−4.633
	0.32	0.9975	0.553	−3.858
	0.48	0.9974	0.566	−3.858
	0.64	0.9989	0.571	−3.932
	1.28	0.9975	0.571	−4.191
pH = 8.7	0.16	0.9984	0.736	−4.974
	0.32	0.9991	0.564	−3.711
	0.48	0.9991	0.658	−4.333
	0.64	0.9971	0.631	−4.178
	1.28	0.9985	0.687	−4.429