Mechanical Strength and Swelling Behavior of Fatty Alcohol Polyoxyethylene Acrylate Hydrophobic Associated Hydrogels†

doi:10.7503/cjcu20160115

Abstract

Abstract:

We designed a series of hydrophobic hydrogels(HA-gels) through micellar copolymerization with acrylamide(AM) as hydrophilic monomer, a little amount of fatty alcohol polyoxyethylene acrylate(AEO-AC-n-m: n is the amount of carbon chain, m is the amount of PEG chain, n, m=10, 5; 13, 5; 13, 10) as hydrophobic monomer, and potassium thiosulfate(KPS) as initiator in sodium dodecyl sulfate(SDS) aqueous solution. The “straight HA-gels” prepared by AEO-AC-13-5 with straight carbon chain, possess uniform network structure and higher mechanical properties and can maintain their shapes in still water for 180 d. Conversely, the “branched HA-gels” synthesized by AEO-AC-10-5, AEO-AC-13-10 with various branched carbon chains, show relatively weak mechanical properties and degrade in water within 60 d. More specifically, the maximum broken stress of straight HA-gels is almost 4—5 times higher than branched HA-gels under the same constraints. On the basis of the neo-Hookean equation of the rubber elastic theory, the effective network chain density ν₀ and the molecular weight of the chain length between cross-linking points M_c were evaluated for straight and branched HA-gels.

Key words: Hydrophobic associated hydrogel, Network structure, Mechanical property, Swelling behavior, Acrylamide, Fatty alcohol polyoxyethylene, Acrylate

CLC Number:

O631
TB324

TrendMD:

GAO Tingting, LI Zhiying, GAO Ge, LIU Fengqi. Mechanical Strength and Swelling Behavior of Fatty Alcohol Polyoxyethylene Acrylate Hydrophobic Associated Hydrogels^†[J]. Chem. J. Chinese Universities, 2016, 37(9): 1744.

Figures/Tables 5

Fig.1 FTIR spectra of AEO-n-m(a—c) and AEO-AC-n-m(d—f) a. AEO-13-5; b. AEO-10-5; c. AEO-13-10;d. AEO-AC-13-5; e. AEO-AC-10-5;f. AEO-AC-13-10.

Fig.2 Changes in optical transmittances as a function of R for dispersion systems of AEO-AC-n-m and SDS a. AEO-AC-13-5; b. AEO-AC-10-5;c. AEO-AC-13-10.

Fig.3 Strain-strain curves(A) of AEO-AC-n-m-AM, swelling rations(B) and gel losses(C) for AEO-AC-n-m-AM a. AEO-AC-13-5-AM; b. AEO-AC-10-5-AM; c. AEO-AC-13-10-AM.

Fig.4 Stress-strain curves of AEO-AC-n-m-AM gels (A) a1. AEO-AC-13-5-AM(1%), a2. AEO-AC-13-5-AM(2%), a3. AEO-AC-13-5-AM(3%), a4. AEO-AC-13-5-AM(4%), a5. AEO-AC-13-5-AM(5%); (B) b1. AEO-AC-10-5-AM(1%), b2. AEO-AC-10-5-AM(2%), b3. AEO-AC-10-5-AM(3%), b4. AEO-AC-10-5-AM(4%), b5. AEO-AC-10-5-AM(5%); (C) c1. AEO-AC-13-10-AM(1%), c2. AEO-AC-13-10-AM(2%), c3. AEO-AC-13-10-AM(3%), c4. AEO-AC-13-10-AM(4%), c5. AEO-AC-13-10-AM(5%).

Table 1 Mechanical properties of AEO-AC-n-m-AM gels

HA-gel	$σ max a$ /kPa	$λ max b$ (%)	σ^c/kPa	ν₀/(mol·m^-3)	10^-4M_c
AEO-AC-13-5-AM(1%)	48.35	1527.95	2.74	0.63	20.61
AEO-AC-13-5-AM(2%)	116.21	1740.12	6.59	1.52	8.57
AEO-AC-13-5-AM(3%)	167.28	1702.62	11.27	2.60	5.01
AEO-AC-13-5-AM(4%)	248.86	1553.86	16.07	3.71	3.51
AEO-AC-13-5-AM(5%)	235.77	1669.62	19.10	4.40	2.96
AEO-AC-10-5-AM(1%)	44.38	2500.11	3.54	0.82	15.95
AEO-AC-10-5-AM(2%)	50.18	2040.39	3.81	0.88	14.82
AEO-AC-10-5-AM(3%)	58.63	1967.89	4.64	1.07	12.17
AEO-AC-10-5-AM(4%)	48.07	1801.78	4.53	1.04	12.47
AEO-AC-10-5-AM(5%)	22.49	1289.10	3.09	0.71	18.27
AEO-AC-13-10-AM(1%)	5.77	1684.22	1.27	0.29	44.46
AEO-AC-13-10-AM(2%)	9.04	1900.39	2.12	0.49	26.64
AEO-AC-13-10-AM(3%)	24.65	2646.97	2.80	0.65	20.17
AEO-AC-13-10-AM(4%)	37.8	2594.57	2.99	0.69	18.89
AEO-AC-13-10-AM(5%)	51.81	1859.36	3.48	0.80	16.23

Table 1 Mechanical properties of AEO-AC-n-m-AM gels

HA-gel	$σ max a$ /kPa	$λ max b$ (%)	σ^c/kPa	ν₀/(mol·m^-3)	10^-4M_c
AEO-AC-13-5-AM(1%)	48.35	1527.95	2.74	0.63	20.61
AEO-AC-13-5-AM(2%)	116.21	1740.12	6.59	1.52	8.57
AEO-AC-13-5-AM(3%)	167.28	1702.62	11.27	2.60	5.01
AEO-AC-13-5-AM(4%)	248.86	1553.86	16.07	3.71	3.51
AEO-AC-13-5-AM(5%)	235.77	1669.62	19.10	4.40	2.96
AEO-AC-10-5-AM(1%)	44.38	2500.11	3.54	0.82	15.95
AEO-AC-10-5-AM(2%)	50.18	2040.39	3.81	0.88	14.82
AEO-AC-10-5-AM(3%)	58.63	1967.89	4.64	1.07	12.17
AEO-AC-10-5-AM(4%)	48.07	1801.78	4.53	1.04	12.47
AEO-AC-10-5-AM(5%)	22.49	1289.10	3.09	0.71	18.27
AEO-AC-13-10-AM(1%)	5.77	1684.22	1.27	0.29	44.46
AEO-AC-13-10-AM(2%)	9.04	1900.39	2.12	0.49	26.64
AEO-AC-13-10-AM(3%)	24.65	2646.97	2.80	0.65	20.17
AEO-AC-13-10-AM(4%)	37.8	2594.57	2.99	0.69	18.89
AEO-AC-13-10-AM(5%)	51.81	1859.36	3.48	0.80	16.23

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