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Effects of modified titanium dioxide nanoparticles on the thermal and mechanical properties of poly(l-lactide)-b-poly(ε-caprolactone)

Ebrahimi, H ; Sharif University of Technology | 2022

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  1. Type of Document: Article
  2. DOI: 10.1007/s13726-022-01039-7
  3. Publisher: Springer Science and Business Media Deutschland GmbH , 2022
  4. Abstract:
  5. Incorporating titanium dioxide (TiO2) nanoparticles into the polymeric matrix offers an opportunity to obtain nanocomposites with improved functionality. In this study, the commercial TiO2 nanoparticles (TNP) were surface treated by different concentrations of aminopropyl triethoxy silane (APTS) as a coupling agent and triethylamine (Et3N) as a surface grafting catalyst by an aqueous process to prepare a nanocomposite with superior properties. Fourier transform infrared spectroscopy (FTIR) and thermogravimetric analysis (TGA) were performed to confirm the successful surface modification of TNP. The prepared modified TiO2 nanoparticles (mTNP) with different weight fractions were used as initiator for in-situ grafting ring-opening polymerization of poly(l-lactide)-b-poly(ε-caprolactone) P(LLA-b-CL). It was found that the mTNP content and the concentration of the coupling agents have essential roles in the molecular characteristics and thermal and mechanical properties of the nanocomposite. The results indicated that the samples having mTNP with a high concentration of APTS had higher molecular weight and superior thermal and mechanical properties. In addition, the prepared samples showed remarkably improved thermal and mechanical properties compared to a neat polylactide (PLLA). The described in-situ synthetic methodology allows an optimal reaction between the components of the synthesis system for the preparation of nanocomposites with improved thermal and mechanical properties. Graphical abstract: [Figure not available: see fulltext.]. © 2022, Iran Polymer and Petrochemical Institute
  6. Keywords:
  7. Nanoparticles ; Polycaprolactone ; Polylactic acid ; Coupling agents ; Fourier transform infrared spectroscopy ; Grafting (chemical) ; Nanocomposites ; Polyesters ; Polymer matrix composites ; Ring opening polymerization ; Thermogravimetric analysis ; TiO2 nanoparticles ; Aminopropyl ; Modified titania ; Poly (l-lactide) ; Poly(ε caprolactone) ; Polymeric matrices ; Silane-coupling agents ; Surface treated ; Thermal and mechanical properties ; TiO 2 ; Titanium dioxide nanoparticles ; Titanium dioxide ; Silane coupling agents
  8. Source: Iranian Polymer Journal (English Edition) ; Volume 31, Issue 7 , 2022 , Pages 893-904 ; 10261265 (ISSN)
  9. URL: https://link.springer.com/article/10.1007/s13726-022-01039-7