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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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This list contains references from the content that can be linked to their source. For a full set of references and notes please see the PDF or HTML where available.

K.M. Lee , P.T. Knight , T. Chung and P.T. Mather , Macromolecules 41, 4730 (2008).

B. Alvarado-Tenorio , A. Romo-Uribe and P.T. Mather , Macromolecules 44, 5682 (2011)

P.T. Knight , K.M. Lee , T. Chung and P.T. Mather , Macromolecules 42, 6596 (2009)

J. Wu and P.T. Mather , Polymer Reviews 49, 25 (2009).

ME Romero-Guzmán , A Romo-Uribe , BM Zarate-Hernandez , R Cruz-Silva , Rheo. Acta. 48, 641652 (2009).

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  • EISSN: 1946-4274
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