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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)
Publication Information
Macromolecular Research / v.14, no.2, 2006 , pp. 209-213 More about this Journal
Abstract
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.
Keywords
alternating magnetic field; D,L-lactide; hyperthermia; ring-opening polymerization; surface-initiated magnetite nanoparticles;
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