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

Published online by Cambridge University Press:  30 July 2012

Bonifacio Alvarado-Tenorio
Affiliation:
Lab. de Nanopolimeros y Coloides, Instituto de Ciencias Fisicas, Universidad Nacional Autonoma de Mexico, Cuernavaca Mor. 62210, MEXICO Syracuse Biomaterials Institute, Syracuse University, Syracuse NY 13244-1240, U.S.A.
Angel Romo-Uribe*
Affiliation:
Lab. de Nanopolimeros y Coloides, Instituto de Ciencias Fisicas, Universidad Nacional Autonoma de Mexico, Cuernavaca Mor. 62210, MEXICO
Patrick T. Mather*
Affiliation:
Syracuse Biomaterials Institute, Syracuse University, Syracuse NY 13244-1240, U.S.A.
*
*To whom correspondence should be addressed: aromo-uribe@fis.unam.mx, ptmather@syr.edu
*To whom correspondence should be addressed: aromo-uribe@fis.unam.mx, ptmather@syr.edu
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Abstract

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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Copyright
Copyright © Materials Research Society 2012

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References

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

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