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Nanofiller Aggregation as Reinforcing Mechanism in Nanocomposites

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Title: Nanofiller Aggregation as Reinforcing Mechanism in Nanocomposites
Authors: Dorigato, Andrea1, Dzenis, Yuris2, Pegoretti, Alessandro1 alessandro.pegoretti@unitn.it
Source: Procedia Engineering. Jul2011, p894-899. 6p.
Subjects: Nanocomposite materials, Clustering of particles, Polymers, Hypothesis, Polyethylene, Electron microscopy, Nanoparticles, X-ray diffraction
Abstract: Abstract: A new approach is proposed to model the elastic properties of polymer nanocomposites taking into account agglomeration effects. In particular, the stiffening effect provided by rigid nanoparticles forming primary aggregates is modelled on the hypothesis that part of the polymer matrix is mechanically constrained within the aggregates. To validate the model, linear-low-density polyethylene (LLDPE)/silica micro- and nano-composites have been prepared by melt compounding followed by hot pressing. Electron microscopy observations indicated that the microstructure of the resulting nanocomposites clearly manifested primary aggregation of nanoparticles. Concurrently, thermal calorimetry and X-ray diffraction analyses proved that the crystallization behaviour was not affected by the presence of the filler. Dog-bone specimens have been mechanically tested under uniaxial tension and the data used to validate the model. A good agreement between theoretical predictions and experimental data was demonstrated. The results coupled with the propensity of nanoparticles to form aggregates could explain significant modulus increases in many nanocomposites systems reported earlier. [Copyright &y& Elsevier]
Copyright of Procedia Engineering is the property of Elsevier B.V. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
Database: Engineering Source
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Header DbId: egs
DbLabel: Engineering Source
An: 61462325
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PubTypeId: academicJournal
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  Data: Nanofiller Aggregation as Reinforcing Mechanism in Nanocomposites
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  Data: <searchLink fieldCode="AR" term="%22Dorigato%2C+Andrea%22">Dorigato, Andrea</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Dzenis%2C+Yuris%22">Dzenis, Yuris</searchLink><relatesTo>2</relatesTo><br /><searchLink fieldCode="AR" term="%22Pegoretti%2C+Alessandro%22">Pegoretti, Alessandro</searchLink><relatesTo>1</relatesTo><i> alessandro.pegoretti@unitn.it</i>
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  Data: <searchLink fieldCode="JN" term="%22Procedia+Engineering%22">Procedia Engineering</searchLink>. Jul2011, p894-899. 6p.
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  Data: <searchLink fieldCode="DE" term="%22Nanocomposite+materials%22">Nanocomposite materials</searchLink><br /><searchLink fieldCode="DE" term="%22Clustering+of+particles%22">Clustering of particles</searchLink><br /><searchLink fieldCode="DE" term="%22Polymers%22">Polymers</searchLink><br /><searchLink fieldCode="DE" term="%22Hypothesis%22">Hypothesis</searchLink><br /><searchLink fieldCode="DE" term="%22Polyethylene%22">Polyethylene</searchLink><br /><searchLink fieldCode="DE" term="%22Electron+microscopy%22">Electron microscopy</searchLink><br /><searchLink fieldCode="DE" term="%22Nanoparticles%22">Nanoparticles</searchLink><br /><searchLink fieldCode="DE" term="%22X-ray+diffraction%22">X-ray diffraction</searchLink>
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  Data: Abstract: A new approach is proposed to model the elastic properties of polymer nanocomposites taking into account agglomeration effects. In particular, the stiffening effect provided by rigid nanoparticles forming primary aggregates is modelled on the hypothesis that part of the polymer matrix is mechanically constrained within the aggregates. To validate the model, linear-low-density polyethylene (LLDPE)/silica micro- and nano-composites have been prepared by melt compounding followed by hot pressing. Electron microscopy observations indicated that the microstructure of the resulting nanocomposites clearly manifested primary aggregation of nanoparticles. Concurrently, thermal calorimetry and X-ray diffraction analyses proved that the crystallization behaviour was not affected by the presence of the filler. Dog-bone specimens have been mechanically tested under uniaxial tension and the data used to validate the model. A good agreement between theoretical predictions and experimental data was demonstrated. The results coupled with the propensity of nanoparticles to form aggregates could explain significant modulus increases in many nanocomposites systems reported earlier. [Copyright &y& Elsevier]
– Name: AbstractSuppliedCopyright
  Label:
  Group: Ab
  Data: <i>Copyright of Procedia Engineering is the property of Elsevier B.V. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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      – Type: doi
        Value: 10.1016/j.proeng.2011.04.147
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      – Code: eng
        Text: English
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        PageCount: 6
        StartPage: 894
    Subjects:
      – SubjectFull: Nanocomposite materials
        Type: general
      – SubjectFull: Clustering of particles
        Type: general
      – SubjectFull: Polymers
        Type: general
      – SubjectFull: Hypothesis
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      – SubjectFull: Polyethylene
        Type: general
      – SubjectFull: Electron microscopy
        Type: general
      – SubjectFull: Nanoparticles
        Type: general
      – SubjectFull: X-ray diffraction
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      – TitleFull: Nanofiller Aggregation as Reinforcing Mechanism in Nanocomposites
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            NameFull: Dorigato, Andrea
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            NameFull: Dzenis, Yuris
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            NameFull: Pegoretti, Alessandro
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            – D: 01
              M: 07
              Text: Jul2011
              Type: published
              Y: 2011
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