Structure and Formation Mechanism of Polyacrylamide-Clay Nanocomposite Gels
(0) A model is presented to describe the structure and formation mechanism of PAAm/clay nanocomposite gels (NC gels), by post-treating the nanocomposite gels in the presence of monomer solution. The PAAm/clay NC gels composed of a unique organic (PAAm)/inorganic (clay) network were first immersed in acrylamide aqueous solution with different concentration for certain time at room temperature. It is found that the resulting nanocomposite gels became swollen, even network collapsed in the monomer solution. Then the above solutions were studied by Transmission electron microscopy (TEM), Element analyses (EA) respectively. It was elucidated that PAAm/clay nanocomposite gels are novel physical crossliking gels, the inorganic clay acts as a multifunctional physical crosslinker in place of an organic cross-linker (BIS) as used in conventional gels. With increasing the post-treatment time, PAAm chains in the PAAm/clay nanocomposite gels detached gradually from the clay surfaces in the monomer solution. TEM images further showed that the clay platelets with about 30nm in diameter and 1 nm in thickness dispersed uniformly into the solution, which are in good agreement with the literature values for hectorite platelets.
hydrogels clay sheets polyacrylamide physical crosslinking
JIANG Yongmei LI Biao LIU Yang YU Hao QIN Zongyi ZHU Meifang H. J. Adler
State Key Lab for Modification of Chemical Fibers & Polymer Materials College of Material Science an Instititue of Macromolecular Chemistry & Textile Chemistry, Dresden University of Technology, Dresde
国际会议
上海
英文
833-835
2007-10-15（万方平台首次上网日期，不代表论文的发表时间）