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Colloids Surf B Biointerfaces. 2009 Jun 1;71(1):67-72. doi: 10.1016/j.colsurfb.2009.01.009. Epub 2009 Jan 17.

Shape memory effect of poly(D,L-lactide)/Fe3O4 nanocomposites by inductive heating of magnetite particles.

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  • 1School of Materials Science and Engineering, Key Laboratory of Advanced Technologies of Materials, Ministry of Education, Southwest Jiaotong University, Chengdu, 610031, PR China.


In this paper, the preparation of biocompatible poly(D,L-lactide) (PDLLA)/magnetite (Fe(3)O(4)) nanocomposites and their shape memory effect are reported. Fe(3)O(4) nanoparticles with an average size of 20 nm were synthesized by chemical co-precipitation and mixed uniformly with a PDLLA matrix. Scanning electron microscopy (SEM), differential scanning calorimetry (DSC), Fourier transform infrared spectroscopy (FTIR) and mechanical testing were carried out to determine the micro-surface morphology, glass transition temperature (T(g)), functional groups change and mechanical properties of the PDLLA/Fe(3)O(4) nanocomposites. The interesting shape memory behavior of the nanocomposites induced by an ultrasonic alternating magnetic field were also observed. SEM and DSC showed that there was a close interaction between the polymer matrix and the magnetic nanoparticles. Formation of weak hydrogen bonds between the C=O in PDLLA and Fe-OH groups of the surface of nano-crystalline Fe(3)O(4) was examined by FTIR. The PDLLA/Fe(3)O(4) nanocomposites displayed a desirable shape memory effect.

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