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Maghemite Intercalated Montmorillonite as New Nanofillers for Photopolymers

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ABSTRACT

In this work, maghemite intercalated montmorillonite (γFe2O3-MMT)/polymer nanocomposites loaded with 1 or 2 wt.% of nanofillers were obtained by photopolymerization of difunctional acrylate monomers. The γFe2O3-MMT nanofillers were prepared by a new method based on the in situ formation of maghemite in the interlayer space of Fe-MMT using a three step process. X-ray diffraction (XRD), chemical analysis, TG/DTA and transmission electron microscopy (TEM) characterization of these nanofillers indicated the efficiency of the synthesis. When following the kinetics of the photopolymerization of diacrylate-γFe2O3-MMT nanocomposites using FTIR spectroscopy no significant inhibition effect of the nanofillers was observed at a loading up to 2 wt.%. These innovative nanocomposites exhibit improved mechanical properties compared to the crude polymer.

No MeSH data available.


UV absorption spectra of crude polymer (UCS) and nanocomposite CS1.
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nanomaterials-02-00413-f008: UV absorption spectra of crude polymer (UCS) and nanocomposite CS1.

Mentions: The degree of conversion of the UV exposed samples was evaluated by infrared spectroscopy, by monitoring continuously the disappearance of the characteristic bands of the reactive group, i.e., at 1590 cm−1 or 1660 cm−1 for the acrylate double bond. The addition of low concentrations of nanofillers (1 and 2 wt.%) to the resin had no negative effect (inner filter effect) on the polymerization kinetics in thin films (10 µm), as shown by the conversion versus time curves reported in Figure 7. This observation can be explained by the very weak UV absorption of the dispersed nanofillers in the absorption range of the photoinitiator (330 to 410 nm) allowing the photopolymerization process to completely cure the films (Figure 8).


Maghemite Intercalated Montmorillonite as New Nanofillers for Photopolymers
UV absorption spectra of crude polymer (UCS) and nanocomposite CS1.
© Copyright Policy
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC5304601&req=5

nanomaterials-02-00413-f008: UV absorption spectra of crude polymer (UCS) and nanocomposite CS1.
Mentions: The degree of conversion of the UV exposed samples was evaluated by infrared spectroscopy, by monitoring continuously the disappearance of the characteristic bands of the reactive group, i.e., at 1590 cm−1 or 1660 cm−1 for the acrylate double bond. The addition of low concentrations of nanofillers (1 and 2 wt.%) to the resin had no negative effect (inner filter effect) on the polymerization kinetics in thin films (10 µm), as shown by the conversion versus time curves reported in Figure 7. This observation can be explained by the very weak UV absorption of the dispersed nanofillers in the absorption range of the photoinitiator (330 to 410 nm) allowing the photopolymerization process to completely cure the films (Figure 8).

View Article: PubMed Central - PubMed

ABSTRACT

In this work, maghemite intercalated montmorillonite (γFe2O3-MMT)/polymer nanocomposites loaded with 1 or 2 wt.% of nanofillers were obtained by photopolymerization of difunctional acrylate monomers. The γFe2O3-MMT nanofillers were prepared by a new method based on the in situ formation of maghemite in the interlayer space of Fe-MMT using a three step process. X-ray diffraction (XRD), chemical analysis, TG/DTA and transmission electron microscopy (TEM) characterization of these nanofillers indicated the efficiency of the synthesis. When following the kinetics of the photopolymerization of diacrylate-γFe2O3-MMT nanocomposites using FTIR spectroscopy no significant inhibition effect of the nanofillers was observed at a loading up to 2 wt.%. These innovative nanocomposites exhibit improved mechanical properties compared to the crude polymer.

No MeSH data available.