聚丙烯酰胺/碳量子点/氧化石墨烯复合水凝胶制备及其性能分析

doi:10.16085/j.issn.1000-6613.2021-0606

摘要/Abstract

摘要：

目前相比于只用一种物理交联剂，同时用两种物理交联剂提高复合水凝胶力学性能的研究少有报道。为了研究同时以碳量子点（CQDs）和氧化石墨烯（GO）作为多官能度物理交联剂对复合水凝胶力学性能的影响，本文首先分别用低温水热法和改进的Hummer法制备了50mg/mL 的CQDs水分散液和5mg/mL的GO水分散液。通过原位自由基聚合的方法，改变CQDs和GO用量，制备了一系列聚丙烯酰胺（PAM）类纳米复合水凝胶（PAM/CQDs/GO）。利用X射线衍射仪、拉力机和流变仪对所得的水凝胶进行表征和测试。得出当用1mL的CQDs水分散液和4mL的GO水分散液制备的PAM/CQDs/GO复合水凝胶力学综合性能最好，其断裂伸长率为3916.86%，拉伸强度为165.3kPa，杨氏模量为33.36kPa。结果表明：适量的CQDs和GO都能提高PAM/CQDs/GO复合水凝胶的多种力学性能，其中GO更有利于增大纳米复合水凝胶的拉伸强度、杨氏模量和耗散能，而CQDs更有利于增大断裂伸长率。与GO相反，CQDs的加入能提高纳米复合水凝胶的黏性、降低其刚性和再次被拉伸时的杨氏模量。通过对CQDs和GO的用量进行调节，可以制备出力学性能不同的纳米复合水凝胶，以满足不同领域的需要，拓宽水凝胶的应用范围。

关键词: 凝胶, 纳米粒子, 流变学, 碳量子点, 氧化石墨烯

Abstract:

There are few reports on improving mechanical properties of composite hydrogel with two physical crosslinking agents compared with only one physical crosslinking agent. In order to study the effect of carbon quantum dots (CQDs) and graphene oxide (GO) as the multifunctional physical crosslinking agent on the mechanical properties of composite hydrogels, 50mg/mL CQDs moisture dispersions and 5mg/mL GO aqueous dispersions were prepared by low-temperature hydrothermal method and improved Hummer method respectively. CQDs and GO as multifunctional physical crosslinking agentssimultaneously, polyacrylamide composite hydrogel (PAM/CQDs/GO)was prepared by in situ radical polymerization at 45^oC.By using X-ray diffractometer, tensile machine and rheometer,the performance of hydrogels were tested. Among them, AC₅G₂ hydrogel possesses the best combination property. The elongation at break, tensile strength and Young's modulus of AC₅G₂ hydrogel are 3916.86%, 165.3kPa and 33.36kPa respectively. The result shows that GO and CQDs can be evenly distributed in the hydrogel, combining the advantages of both GO and CQDs, which can improve the mechanical properties of NC hydrogel, especially the elongation at break. Both proper amounts of CQDs and GO can improve the mechanical properties of PAM/CQDs/GO composite hydrogel. The addition of GO is more favorable to improve the tensile strength, Young's modulus and dissipated energyof the hydrogel, while the addition of CQDs is more beneficial to increase the elongation at break.In contrast to GO, the addition of CQDs can also increase the viscosity, decrease the rigidity and decrease the Young's modulus of the hydrogel when stretched again. By adjusting the concentration of CQDs and GO, PAM/CQDs/GO composite hydrogel with different mechanical properties can be prepared to meet the needs of different fields, and broaden the application of NC hydrogel.

Key words: gels, nanoparticles, rheology, carbon quantum dots, graphene oxide

中图分类号:

杨晓芳, 魏铭, 孙力. 聚丙烯酰胺/碳量子点/氧化石墨烯复合水凝胶制备及其性能分析[J]. 化工进展, 2021, 40(S2): 301-308.

YANG Xiaofang, WEI Ming, SUN Li. Preparation and research of PAM/CQDs/GO composite hydrogel[J]. Chemical Industry and Engineering Progress, 2021, 40(S2): 301-308.

图/表 10

参考文献 21

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样品	AM/g	CQDs^①/mL	GO^②/mL	H₂O/mL	APS^③/mL
AC₅G₀	2.5	1	0	8	1
AC₅G_0.5	2.5	1	1	7	1
AC₅G₁	2.5	1	2	6	1
AC₅G₂	2.5	1	4	4	1
AC₅G₄	2.5	1	8	0	1
AC₀G₂	2.5	0	4	5	1
AC₁G₂	2.5	0.2	4	4.8	1
AC_2.5G₂	2.5	0.5	4	4.5	1
AC₁₀G₂	2.5	2	4	3	1
AC₂₀G₂	2.5	4	4	1	1
AC₂₅G₂	2.5	5	4	0	1

样品	AM/g	CQDs^①/mL	GO^②/mL	H₂O/mL	APS^③/mL
AC₅G₀	2.5	1	0	8	1
AC₅G_0.5	2.5	1	1	7	1
AC₅G₁	2.5	1	2	6	1
AC₅G₂	2.5	1	4	4	1
AC₅G₄	2.5	1	8	0	1
AC₀G₂	2.5	0	4	5	1
AC₁G₂	2.5	0.2	4	4.8	1
AC_2.5G₂	2.5	0.5	4	4.5	1
AC₁₀G₂	2.5	2	4	3	1
AC₂₀G₂	2.5	4	4	1	1
AC₂₅G₂	2.5	5	4	0	1

样品	拉伸强度/kPa	断裂伸长率/%	应变能密度^①/MJ·m^-3	杨氏模量^②/kPa	耗散能/kJ·m^-3
AC₅G₀	76.31	3512.64	1.40	28.57	31.39
AC₅G_0.5	118.25	4343.81	2.54	29.40	52.13
AC₅G₁	131.87	4177.45	3.07	32.15	85.41
AC₅G₂	165.30	3916.86	3.77	33.36	133.84
AC₅G₄	69.52	2140.54	1.06	32.40	223.45
AC₀G₂	110.13	2091.19	1.33	29.82	75.57
AC₁G₂	117.46	2187.46	1.60	32.86	125.74
AC_2.5G₂	119.86	2972.61	2.39	33.13	136.82
AC₁₀G₂	75.22	3420.51	1.83	24.72	53.45
AC₂₀G₂	31.52	2272.36	0.49	18.27	38.16
AC₂₅G₂	20.57	2178.32	0.35	16.91	40.83

样品	拉伸强度/kPa	断裂伸长率/%	应变能密度^①/MJ·m^-3	杨氏模量^②/kPa	耗散能/kJ·m^-3
AC₅G₀	76.31	3512.64	1.40	28.57	31.39
AC₅G_0.5	118.25	4343.81	2.54	29.40	52.13
AC₅G₁	131.87	4177.45	3.07	32.15	85.41
AC₅G₂	165.30	3916.86	3.77	33.36	133.84
AC₅G₄	69.52	2140.54	1.06	32.40	223.45
AC₀G₂	110.13	2091.19	1.33	29.82	75.57
AC₁G₂	117.46	2187.46	1.60	32.86	125.74
AC_2.5G₂	119.86	2972.61	2.39	33.13	136.82
AC₁₀G₂	75.22	3420.51	1.83	24.72	53.45
AC₂₀G₂	31.52	2272.36	0.49	18.27	38.16
AC₂₅G₂	20.57	2178.32	0.35	16.91	40.83

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