Macromolecular Research

  • 제14권2호
  • /
  • Pages.209-213
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  • 2006
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  • 1598-5032(pISSN)
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  • 2092-7673(eISSN)
한국고분자학회 (The Polymer Society of Korea)
권호 표지

Ring Oxpening Polymerization of D,L-Lactide on Magnetite Nanoparticles

  • Tian Jing (School of Chemical Engineering and Technology, TianJin University) ;
  • Feng Ya-Kai (School of Chemical Engineering and Technology, TianJin University) ;
  • Xu Yong-Shen (School of Chemical Engineering and Technology, TianJin University)
  • 발행 : 2006.04.01
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초록

The ring-opening polymerization of D,L-lactide initiated by tin(II) 2-ethylhexanoate $(Sn(Oct)_2)$ on the surface-initiated magnetite $(Fe_{3}O_4)$ nanoparticles was performed at $130^{\circ}C$. The effects of the polymer molar mass and concentration on the amount of surface polymer were investigated. The number average molecular weights, $M_n$, obtained by both NMR and GPC methods fit well within the accuracy of the applied methods and ranged from 1,100 to $4,040g\;mol^{-1}$. A surface functionalization density of up to 625 initiation sites per particle was obtained. The composition of various core-shell particles was determined by TGA, with results indicating magnetite $(Fe_{3}O_4)$ contents, ${\mu}m$, between 17 and 59 wt%. Under the influence of a magnetic field, the heating generated by superparamagnetic core-shell particles suspended in toluene presented guidelines for an optimization of magnetic particle systems with respect to an application for hyperthermia.

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