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Synthesis and characterization of poly(L-lactide)-block-poly(ε-caprolactone)-grafted titanium dioxide nanoparticles via ring-opening in situ grafting polymerization

Ebrahimi, H ; Sharif University of Technology | 2021

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  1. Type of Document: Article
  2. DOI: 10.1002/pc.26087
  3. Publisher: John Wiley and Sons Inc , 2021
  4. Abstract:
  5. The synthesis of nanocomposites via in situ grafting polymerization due to its ability to produce polymeric materials with promising microscopic and macroscopic characteristics is becoming very attractive. In this paper, different poly(L-Lactide)-block-poly(ε-caprolactone) (PLLA-b-PCL) copolymers were in situ synthesized in the presence of modified titanium dioxide (TiO2) nanoparticles (mTNP) as the initiator and stannous octoate as the catalyst. The surface of TiO2 was modified by grafting aminopropyl trimethoxy silane to improve initiator efficiency. Copolymers with 90/10, 70/30, and 50/50 mass ratio of L-lactide/ ε-caprolactone and 5 wt% of mTNP (proportional to ε-caprolactone) were synthesized. The samples were characterized by HNMR, CNMR, FTIR, GPC, TGA, TEM, and DSC, confirming the successful formation of PLLA-b-PCL on the surface of mTNP. Tensile test results showed the synthesized nanocomposite with mass ratio of LLA/CL = 70/30 had optimum mechanical properties among other nanocomposites and also in comparison with the neat PLA. © 2021 Society of Plastics Engineers
  6. Keywords:
  7. Grafting (chemical) ; Nanocomposites ; Nanoparticles ; Oxide minerals ; Synthesis (chemical) ; Tensile testing ; TiO2 nanoparticles ; Titanium dioxide ; In-situ grafting ; In-situ synthesized ; Initiator efficiency ; Poly (epsiloncaprolactone) ; Poly (l-lactide) ; Stannous octoate ; Synthesis and characterizations ; Titanium dioxides (TiO2) ; Ring opening polymerization
  8. Source: Polymer Composites ; Volume 42, Issue 8 , 2021 , Pages 3722-3731 ; 02728397 (ISSN)
  9. URL: https://onlinelibrary.wiley.com/doi/10.1002/pc.26087