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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 ,
Angel Romo-Uribe  and
Patrick T. Mather
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: [email protected], [email protected]
*To whom correspondence should be addressed: [email protected], [email protected]
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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.

Keywords

biomaterialx-ray diffraction (XRD)polymer
Type
Articles
Information
MRS Online Proceedings Library (OPL) , Volume 1450: Symposium CC – Hierarchically Self-Assembled Materials—From Molecule to Nano and Beyond , 2012 , mrss12-1450-cc03-23
Copyright
Copyright © Materials Research Society 2012

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References

REFERENCES

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