Structural, Morphological and Swelling Properties of Novel (NaAA-co-HEA)/Mg-Al-Cl Layered Double Hydroxide Nanocomposite Hydrogels

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Yılmaz Ö., BAL A., GÖK M. K., GÜÇLÜ G., PABUCCUOĞLU S. K.

CHEMTECH'14 / Chemical Engineering and Chemical Technologies Conference, İstanbul, Turkey, 23 - 25 October 2014, vol.1, no.1, pp.279-287, (Full Text)

  • Publication Type: Conference Paper / Full Text
  • Volume: 1
  • City: İstanbul
  • Country: Turkey
  • Page Numbers: pp.279-287
  • Open Archive Collection: AVESIS Open Access Collection
  • Istanbul University Affiliated: Yes

Abstract

 

The layered double hydroxides (LDHs), also called anionic clays, are composed of positively charged layers with interlayer exchangeable anions. LDHs have physical and chemical properties that are surprisingly similar to the properties of clay. Its general composition can be represented as [MII1-X MIIIX (OH)2]X+ [Aq-x/q .nH2O], where MII and MIII are divalent and trivalent cations, respectively, and Aq- is an exchangeable anion. The layer metal cations can be chosen among a wide selection, such as Mg2+, Ni2+, Zn2+, Al3+, Fe3+, etc. In recent years, LDHs have been used as nanoparticles for preparing polymer-based nanocomposites (Pabuccuoğlu et al., 2013).

 

In this study, Mg-Al-Cl LDH was prepared by the coprecipitation method described in the literature (Pabuccuoğlu et al., 2013). Then, acrylate monomer based novel nanocomposite hydrogels containing Mg–Al–Cl LDH [(NaAA-co-HEA)/Mg-Al-Cl LDHs] were synthesized by using sodium acrylate (NaAA) and 2-hydroxyethyl acrylate (HEA) as monomers, potassium persulfate–bisulfite as initiator, N,N-methylenebisacrylamide (NMBA) as cross-linker and different amounts (1, 3, 5 % of total monomer weight) of Mg-Al-Cl LDH. The formation, morphological and structural properties of (NaAA-co-HEA)/Mg-Al-Cl LDHs were investigated by FTIR, XRD and SEM analyses. Swelling behaviors of (NaAA-co-HEA)/Mg-Al-Cl LDHs were also examined in distilled water. The results show that (NaAA-co-HEA)/Mg-Al-Cl LDHs have been formed. As the content of Mg-Al-Cl LDHs increased, equilibrium swelling degree of the nanocomposite hydrogels decreased due to the Mg-Al-Cl LDHs acting as crosslinking agent.