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Stress-induced Bimodal Ordering in POSS/PCL Biodegradable Shape Memory Nanocomposites

  • Bonifacio Alvarado-Tenorio (a1) (a2), Angel Romo-Uribe (a1) and Patrick T. Mather (a2)

Simultaneous wide- and small- angle X-ray scattering (WAXS-SAXS) has revealed a stress-induced bimodal orientation of POSS crystals and PCL chains, both in a constrained POSS/PCL crosslinked network architecture with shape memory properties. POSS/PCL nanocomposites with molecular weight of 2,600 g/mol exhibiting shape memory behavior were synthesized and variation of crosslinker molar ratio was used to obtain POSS/PCL networks with different crosslink density (Alvarado-Tenorio et al., Macromolecules, 44, 5682, 2011). In that study it was shown that there are POSS crystals embedded in an amorphous PCL matrix, and the POSS crystals were ordered in a cubic nanostructure. In this work, it will be shown that elongation at room temperature of all the networks yielded a double-induced orientation (90º and 180º) of the POSS crystals, as indicated by the 101 reflection. Moreover, it was also detected stretched-induced crystallization of the otherwise amorphous PCL chains. Furthermore, SAXS data showed long periods in the meridional and equatorial orientations of 630 Å, 90 Å and 45 Å corresponding to a lamellar nanostructure of PCL chains. The induced bimodal orientation of the POSS-PCL molecular network will be correlated with its shape memory properties.

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Lee K.M., Knight P.T., Chung T. and Mather P.T., Macromolecules 41, 4730 (2008).
Alvarado-Tenorio B., Romo-Uribe A. and Mather P.T., Macromolecules 44, 5682 (2011)
Knight P.T., Lee K.M., Chung T. and Mather P.T., Macromolecules 42, 6596 (2009)
Wu J. and Mather P.T., Polymer Reviews 49, 25 (2009).
Joshi M. and Butola B.S., Polymer Reviews 44, 389 (2004).
Romero-Guzmán ME, Romo-Uribe A, Zarate-Hernandez BM, Cruz-Silva R, Rheo. Acta. 48, 641652 (2009).
Alvarado-Tenorio B., PhD Thesis, Universidad Nacional Autonoma de Mexico (2011).
Huitron-Rattinger E, PhD Thesis, Universidad Nacional Autonoma de Mexico (2012).
Stein R.S., Newer Methods of Polymer Characterization, (Interscience Publishers, New York 1964) p. 155
Alvarado-Tenorio B, Romo-Uribe A, Mather PT, Polymeric Materials: Science & Engineering 105, 854 (2011)
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