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In situ emulsion polymerization and characterization of PVAc nanocomposites including colloidal silica nanoparticles for wood specimens bonding

Azamian Jazi, M ; Sharif University of Technology | 2020

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  1. Type of Document: Article
  2. DOI: 10.1002/app.48570
  3. Publisher: John Wiley and Sons Inc , 2020
  4. Abstract:
  5. Polyvinyl acetate (PVAc) nanocomposites for wood adhesives containing different amounts of colloidal silica nanoparticles (CSNs) were synthesized via in situ one-step emulsion polymerization. The adhesion strength of wood specimens bonded by PVAc nanocomposites was investigated by the tensile test. Thermal properties of PVAc nanocomposites were also characterized by differential scanning calorimetry and thermogravimetric analysis. Rheological and morphological properties of the PVAc nanocomposites were investigated using rheometric mechanical spectrometry and field emission scanning electron microscopy (FESEM), respectively. The obtaining results showed that the shear strength of PVAc nanocomposite including 1 wt. % CSNs has the highest shear and tensile strength about 4.7 and 3.2 MPa, respectively. A small increment of Tg (~3 °C) and considerable increment of the ash content proved the enhancement of PVAc thermal characterization in the presence of CSNs. FESEM results showed uniform dispersion of nanoparticles throughout the PVAc matrix due to using the in situ emulsion polymerization process. © 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2020, 137, 48570. © 2019 Wiley Periodicals, Inc
  6. Keywords:
  7. in situ polymerization ; nanocomposite ; polyvinyl acetate ; Adhesives ; Differential scanning calorimetry ; Emulsification ; Emulsion polymerization ; Field emission microscopes ; Nanocomposites ; Nanoparticles ; Polyvinyl acetates ; Scanning electron microscopy ; Silica ; Silica nanoparticles ; Synthesis (chemical) ; Tensile strength ; Tensile testing ; Thermogravimetric analysis ; Wood ; Colloidal silica ; Field emission scanning electron microscopy ; In-situ emulsion polymerization ; In-situ polymerization ; Polyvinyl acetates (PVAc) ; Rheological and morphological properties ; Thermal characterization ; Wood bonding ; Colloids
  8. Source: Journal of Applied Polymer Science ; Volume 137, Issue 15 , 2020
  9. URL: https://onlinelibrary.wiley.com/doi/abs/10.1002/app.48570