刺激響應(yīng)型聚丙烯酸類疏水締合水凝膠
[Abstract]:Hydrogels are attracting more and more attention because of their unique advantages. Because it contains a lot of water to endow the hydrogel with super elasticity, it plays an important role in many fields, including tissue engineering, biomedicine and various sensors. In some special fields, hydrogels are required to have certain mechanical properties or sensitivity. Therefore, the researchers began to study and explore the toughening hydrogels based on various toughening mechanisms and the stimulus-responsive hydrogels responsive to different stimuli, and obtained some achievements. Up to now, there have been a lot of reports about the strong and tough hydrogels, most of which are based on the ability to generate effective energy dissipation, which makes the hydrogels difficult to break or fracture during deformation and thus have higher strength or toughness. There are many toughening mechanisms, including hydrophobic association interaction, hydrogen bond interaction, dipole-dipole interaction, metal complexation, double networks and macromolecular microspheres. Among them hydrophobic association often aroused people's great interest. In this paper, the hydrophobic association toughening mechanism was used to successfully prepare the ductile hydrogels with certain mechanical properties. The hydrogel was prepared by introducing hydrophobic groups into the system and using hydrophobic self-assembly micelles to act as dynamic crosslinking points in the presence of surfactants. In the process of deformation, the hydrophobic segments of the entangled micelles will be unwrapped or slip, and a large amount of energy will be dissipated, thus making the hydrophobic associating hydrogels have good mechanical properties. However, in some fields, sensitive hydrogels are required to change under certain stimuli. Most scholars have studied and published many stimuli-responsive hydrogels related to sol-gel transition. These hydrogels have good applications and potential applications in drug controlled release and drug transport carriers. However, the mechanical properties of these hydrogels are generally poor, and some applications which require both mechanical properties and stimuli responsiveness will be greatly restricted. Therefore, the preparation of hydrogels with good mechanical properties and stimulus response is of great significance. Based on hydrophobically associating hydrogels, The stimulus-responsive hydrogels with good mechanical properties and adjustable mechanical properties were successfully prepared using environment-responsive acrylic materials. One was the pH responsive hydrophobic hydrophobically associating hydrophobic hydrogel with adjustable mechanical properties. The mechanical properties of hydrogels can be regulated by adjusting the interaction between metal complexes, hydrogen bonds and hydrophobic association of pH. One is a kind of photo-responsive hydrophobically associating hydrogel with adjustable mechanical properties. The citric acid molecule is used as the photoresponse material and the redox between Fe (III) and Fe (II) is the driving force. Furthermore, the mechanical properties of hydrogels are regulated. We expect that this kind of hydrogel will provide more possibilities for the design of various hydrogels and greatly expand the application of hydrogels to a certain extent.
【學(xué)位授予單位】:長春工業(yè)大學(xué)
【學(xué)位級別】:碩士
【學(xué)位授予年份】:2017
【分類號】:O648.17
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