Skip to main content Accessibility help
×
Home

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)

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.

Copyright

Corresponding author

*To whom correspondence should be addressed: aromo-uribe@fis.unam.mx, ptmather@syr.edu

References

Hide All
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)

Keywords

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)

Metrics

Full text views

Total number of HTML views: 0
Total number of PDF views: 0 *
Loading metrics...

Abstract views

Total abstract views: 0 *
Loading metrics...

* Views captured on Cambridge Core between <date>. This data will be updated every 24 hours.

Usage data cannot currently be displayed