کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1694665 | 1519080 | 2014 | 6 صفحه PDF | دانلود رایگان |
• A new intercalator DMAPMA along with AA was chosen to modify Mt.
• The ionicity of neutralized AA prevented the re-aggregation of Mt layers.
• Mt showed a high degree of intercalation and kept a natural hydrophilicity.
• No extra chemical crosslinking agents were used in the hydrogel synthesis.
• The hydrogel showed improved compressive strength.
It is important for montmorillonite (Mt) -based nanocomposites to achieve good intercalation or exfoliation of Mt in composite structure. In this paper, N-[3-(dimethylamino)propyl] methacrylamide (DMAPMA), which is nonionic in neutral solution but cationic character in acid solution, and acrylic acid (AA) were used to modify Mt with AA together. Here DMAPMA and AA were used not only as the intercalators to disperse and intercalate Mt but also as the main monomers to form amphoteric nanocomposite hydrogels. The XRD and TEM results illustrated that an exfoliated or a highly intercalated nanocomposite structure was obtained. Compression strength of amphoteric nanocomposite hydrogel reached 54.4 kPa under the water content of 99.8%. It should be emphasized that the excellent mechanical property of the hydrogels was reached without adding chemical crosslinking agents. Compared with the organic hydrogel, the hydrogels showed significant improvement in swelling capacity.
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Journal: Applied Clay Science - Volumes 97–98, August 2014, Pages 132–137