Stress-induced bimodal ordering in POSS/PCL biodegradable shape memory nanocomposites

Bonifacio Alvarado-Tenorio, Angel Romo-Uribe, Patrick T. Mather

Research output: Chapter in Book/Report/Conference proceedingConference contribution

4 Scopus citations

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 (90° and 180°) 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.

Original languageEnglish (US)
Title of host publicationNanoscale Materials Modification by Photon, Ion, and Electron Beams
Pages14-19
Number of pages6
DOIs
StatePublished - Dec 1 2012
Event2012 MRS Spring Meeting - San Francisco, CA, United States
Duration: Apr 9 2012Apr 13 2012

Publication series

NameMaterials Research Society Symposium Proceedings
Volume1450
ISSN (Print)0272-9172

Other

Other2012 MRS Spring Meeting
CountryUnited States
CitySan Francisco, CA
Period4/9/124/13/12

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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    Alvarado-Tenorio, B., Romo-Uribe, A., & Mather, P. T. (2012). Stress-induced bimodal ordering in POSS/PCL biodegradable shape memory nanocomposites. In Nanoscale Materials Modification by Photon, Ion, and Electron Beams (pp. 14-19). (Materials Research Society Symposium Proceedings; Vol. 1450). https://doi.org/10.1557/opl.2012.1327