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

Table 4

(a) Thermogravimetric parameters for P(DMA-MAx) hydrogels with different compositions of MA. (b) Thermogravimetric parameters for P(DMA-MA8) hydrogels with different compositions of NMBA.

(a)

Hydrogels	Stage 1		Stage 2
	Δ𝑇^a (°C)	Δ𝑚^b (wt%)	Δ𝑇^a (°C)	𝑇max^c (°C)	Residual weight (wt%)
PDMA	55–170	4	366–475	447	0
P(DMA-MA8)	55–219	5.7	312–488	440	4.38
P(DMA-MA15)	53–220	9	281–485	428	6.44
P(DMA-MA29)	55–230	11	262–471	409	7.72
P(DMA-MA33)	56–224	13	254–489	406	9.42
P(DMA-MA38)	54–223	16	241–472	397	11.6

aTemperature range.
bTotal weight loss percentage at the end of the step.
cTemperature maximum values of DTGA curves.

(b)

Composition of NMBA (mol%)	Stage 1		Stage 2
	Δ𝑇^a (°C)	Δ𝑚^b (wt%)	Δ𝑇^a (°C)	𝑇max^c (°C)	Residual weight (wt%)
0.16	52–220	5	279–467	434	4.13
0.32	53–219	5.7	281–479	441	4.36
0.48	58–220	4.58	277–478	442	3.71
0.64	58–222	5.11	283–486	449	3.59
1.28	59–211	4.38	285–496	485	3.47

aTemperature range.
bTotal weight loss percentage at the end of the step.
cTemperature maximum values of DTGA curves.