一种高强度抗脱水纳米复合水凝胶的合成及表征
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摘要
水和甘油的混合溶液为液态组分,丙烯酸(AA)和N,N-二甲基丙烯酰胺(DMAA)为共聚单体,纳米氧化铝(Al2O3)为交联剂,原位自由基聚合制备了一种具有抗脱水性能的高强度纳米复合水凝胶。扫描电子显微镜表征和力学性质测试结果表明,甘油的加入不会影响单体的聚合以及水凝胶三维网络结构的形成。当甘油质量分数从0%增加到40%时,水凝胶的拉伸强度由181. 3 k Pa增加到274. 6 k Pa;进一步增加甘油质量分数至80%,水凝胶的拉伸强度逐渐减小至113. 6 k Pa。热重分析、差示扫描量热法以及抗脱水实验研究结果显示,随着甘油含量的增加,水凝胶在空气中的水分蒸发逐渐降低,显示出优异的抗脱水性能。基于水凝胶优异的力学性质和抗脱水性能,当甘油质量分数为60%和80%时,水凝胶在空气中放置10 d依然能保持与初始制备水凝胶相当的优异力学性质。这种新型水凝胶在人工皮肤、软机器人领域有潜在的应用价值。
Hydrogels with high mechanical strength and anti-dehydration property were prepared by in situ free radical polymerization of acrylic acid( AA) and N,N-dimethyl acrylamide( DMAA) in the mixture solution of water and glycerol using alumina( Al2O3) nanoparticles as cross-linking agent. The results from SEM characterization and mechanical measurements reveal that the introduction of glycerol into the hydrogel system would not hinder the monomer polymerization and the formation of polymer network structures. The tensile strength of hydrogels increases from 181. 3kPa to 274. 6 k Pa as the glycerol mass fraction increases from 0% to 40%,while further increasing the glycerol mass fraction to 80% results in gradual decrease of the tensile strength to 113. 6 kPa. Furthermore,the results from TGA,DSC and anti-dehydration of hydrogels indicate that the anti-dehydration property of hydrogels is enhanced with increasing of the glycerol content. Based on the excellent mechanical performance and anti-dehydration property,the hydrogels with the mass fraction 60% and 80% of glycerol exhibit excellent mechanical properties comparable to those at as-prepared state after placed in air for 10 d. Therefore,this new kind of hydrogel would have potential applications in fields of artificial skin,soft robot and so on.
Hydrogels with high mechanical strength and anti-dehydration property were prepared by in situ free radical polymerization of acrylic acid( AA) and N,N-dimethyl acrylamide( DMAA) in the mixture solution of water and glycerol using alumina( Al2O3) nanoparticles as cross-linking agent. The results from SEM characterization and mechanical measurements reveal that the introduction of glycerol into the hydrogel system would not hinder the monomer polymerization and the formation of polymer network structures. The tensile strength of hydrogels increases from 181. 3kPa to 274. 6 k Pa as the glycerol mass fraction increases from 0% to 40%,while further increasing the glycerol mass fraction to 80% results in gradual decrease of the tensile strength to 113. 6 kPa. Furthermore,the results from TGA,DSC and anti-dehydration of hydrogels indicate that the anti-dehydration property of hydrogels is enhanced with increasing of the glycerol content. Based on the excellent mechanical performance and anti-dehydration property,the hydrogels with the mass fraction 60% and 80% of glycerol exhibit excellent mechanical properties comparable to those at as-prepared state after placed in air for 10 d. Therefore,this new kind of hydrogel would have potential applications in fields of artificial skin,soft robot and so on.
引文
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[3] Caccavo D,Cascone S,Lamberti G,et al. Drug delivery from hydrogels:a general framework for the release modeling[J]. Curr.Drug Deliv.,2017,14:179-189.
[4] Kim S H,Jung S,Yoon I S,et al. Ultrastretchable conductor fabricated on skin-like hydrogel-elastomer hybrid substrates for skin electronics[J]. Adv. Mater.,2018,30:1800109.
[5] Zheng W J,An N,Yang,J H,et al. Tough al-alginate/poly(n-isopropylacrylamide)hydrogel with tunable LCST for soft robotics[J].ACS Appl. Mater. Inter.,2015,7:1758-1764.
[6] Haraguchi K,Takehisa T,Fan S. Effects of clay content on the properties of nanocomposite hydrogels composed of poly(N-isopropylacrylamide)and clay[J]. Macromolecules,2002,35:10162-10171.
[7] Zhao X. Multi-scale multi-mechanism design of tough hydrogels:building dissipation into stretchy networks[J]. Soft Matter,2014,10:672-687.
[8]秦绪平,赵芳,冯圣玉.高力学强度水凝胶的研究进展[J].高分子材料科学与工程2012,28(3):174-178.Qin X P,Zhao F,Feng S Y. Research development of hydrogels with high mechanical strength[J]. Polymer Materials Science&Engineering,2012,28(3):174-178.
[9]许波,李配,李欢军,等。高强度温敏性聚N-异丙基丙烯酰胺/Si O2纳米复合水凝胶的制备表征及形状记忆行为[J].高分子材料科学与工程,2018,34(6):139-144.Xu B,Li P,Li H J,et al. Synthesis and characterization of high strength and temperature-sensitive PINPA/SiO2nanocomposite hydrogels with shape memory behavior[J]. Polymer Materials Science&Engineering,2018,34(6):139-144.
[10] Fan H,Wang J,Jin Z. Tough,swelling-resistant,self-healing,and adhesive dual-cross-linked hydrogels based on polymer-tannic acid multiple hydrogen bonds[J]. Macromolecules,2018,51:1696-1705.
[11] Kamata H,Akagi Y,Kayasuga-Kariya Y,et al."Nonswellable"hydrogel without mechanical hysteresis[J]. Science,2014,343:873-875.
[12] Xu B,Wang L,Liu Y,et al. Preparation of high strength and transparent nanocomposite hydrogels using alumina nanoparticles as crosslinking agents[J]. Mater. Lett.,2018,228:104-107.
[13] Han L,Liu K,Wang M,et al. Mussel-inspired adhesive and conductive hydrogel with long-lasting moisture and extreme temperature tolerance[J]. Adv. Funct. Mater.,2018,28:1704195.