具有磁响应性的黏土聚N-异丙基丙烯酰胺(PNIPAm)纳米复合水凝胶.pdfVIP

东华大学硕士论文 MAGNETICRESPONSIVECLAY/PNIPAm NANOCOMPOSITEHYDROGELS Abstract In recent ten years, nanocomposite hydrogels (NC gels), which employ inorganic clay as a multifunctional cross-linker, have been draw more attentions due to its excellent mechanical properties, optical transparency and swelling/deswelling behavior. NC gels are composed of organic polymer matrix and inorganic clay, the hydrogel matrix like PNIPAm exhibit themal sensitivity in aqueous solution. The inorganic clay reinforce the NC gels and improve its mechanical performance, but they add no additional properties such as response to light, electric and magnetic field to the hydrogels. The directly incorporation of functional nanoparticles into PNIPAm hydrogels endow their specific functionalization, but may cause negative effect on the mechanical properties of hydrogels and can inefficient for trapping the functional nanoparticles due to the absence of cross-linking interaction and to a pore size larger than the size of nanoparticles. In this paper, from the views of functionality and mechanical properties of hydrogels, the functionlized Fe O nanoparticles are 3 4 successfully utilized as cross-linkers to prepare magnetic nanocomposite hydrogels with reinforced mechanical properties. (1) Firstly, the Fe O nanoparticles were synthesized via chemical 3 4 co-precipitation method. Then, azide-functional