Preparation of clay/epoxy nanocomposites by layered-double-hydroxide initiated self-polymerization |
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Authors: | Ying-Nan Chan Yi-Lin Liao Jiang-Jen Lin |
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Affiliation: | a Department of Chemical Engineering, National Chung-Hsing University, Taichung, Taiwan b Institute of Polymer Science and Engineering, National Taiwan University, Taipei, Taiwan |
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Abstract: | An anionic clay, magnesium-aluminum layered double hydroxide (Mg2Al-NO3-LDH), was prepared by a co-precipitation method and intercalated with poly(oxypropylene)-amindocarboxylic acid (POP-amido acid). Depending on the POP-intercalating agents with molecular weight at 2000 or 400 g/mol, the intercalated LDHs were analyzed to have d spacing of 6.8 or 2.7 nm and organic incorporation of 80 and 55 wt%, respectively. Two comparative POP/LDH hybrids were allowed to initiate the self-polymerization of the epoxy resin, diglycidyl ether of bisphenol-A (DGEBA). The curing rate was significantly increased by using the hybrids as initiators for epoxy curing, demonstrated by DSC thermal analysis that the exothermic peak shifted from 182 to 152 °C by increasing organoclay addition. The resultant nanocomposites prepared from the anionic LDH initiated epoxy self-polymerization have the improved thermal and physical properties, evidenced by TGA, XRD, TEM, and SEM analyses. |
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Keywords: | Epoxy Layered double hydroxides Nanocomposite |
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