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In fact, GO is a perfect candidate for fabricating novel superabsorbent hydrogels because of abundant hydrophilic groups on the surface [2¨C5]. It is easy for GO to form a good interfacial interaction with the hydrophilic matrix through chemical or hydrogen bonds. In addition, the thermal behavior and mechanical strength of the hydrogels may be enhanced owing to the outstanding thermal resistance and mechanical properties of GO sheets [4]. Moreover, it is expected that the swelling properties of the hydrogel nanocomposites may be improved due to the numerous hydrophilic groups on the surface of GO sheets.
      In this manuscript, we prepared a series of graphene oxide/poly(acrylic acid-co-acrylamide) (GO/P(AA-co-AM)) superabsorbent hydrogel nanocomposites via in situ radical solution polymerization. The effects of GO content on the chemical structure,morphology and miscibility of the super-absorbent hydrogels were studied by Fourier transform infrared spectroscopy (FTIR), wide-angle X-ray diffraction (WXRD), dynamic mechanical thermal analysis (DMA), field emission scanning electron microscopy
(FESEM) and optical microscopy (OM). Additionally, the swelling behaviors, swelling kinetics and pH-responsive behaviors of the hydrogels were also evaluated in details. A basic understanding of the swelling behavior for super-absorbent hydrogel nanocomposites in the solutions with different pH values (1¨C13) is essential for a successful research and application of the new materials
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ÊÂʵÉÏ, GO£¨Ñõ»¯Ê¯Ä«Ï© graphene oxide£©ÊÇÖÆ×÷ÐÂÐ͸ßÎüË®ÐÔÊ÷֬ˮÄý½ºµÄÍêÃÀºòÑ¡Õߣ¬ÒòΪÆä±íÃæ¾ßÓзḻµÄÇ×Ë®¼¯ÍÅ[2-5]¡£Í¨¹ý»¯Ñ§Æ·»òÇâ¼üGOºÍÇ×Ë®¹Ç¼ÜÈÝÒ×ÐγÉÁ¼ºÃµÄ½çÃæ½»»¥×÷Óá£ÁíÍ⣬ÓÉÓÚGOƬ³öÉ«µÄÈÈ×èºÍÁ¦Ñ§ÐÔÄÜ£¬Ë®Äý½ºµÄÈÈÐÔÄܺͻúеǿ¶È»áÌá¸ß¡£ [4]. ³ý´ËÖ®Í⣬ÓÉÓÚGOƬ±íÃæÓкܶàÇ×Ë®¼¯ÍÅ£¬Ô¤¼ÆÄÉÃ׸´ºÏË®Äý½ºµÄÅòÕÍÐÔÖÊ»áÌáÉý¡£
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