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Materials 2010, 3(2), 1461-1477; doi:10.3390/ma3021461

Polymer Nanocomposites Containing Anisotropic Metal Nanostructures as Internal Strain Indicators

1
Dipartimento di Chimica e Chimica Industriale, Università di Pisa, Via Risorgimento 35, 56126 Pisa, Italy
2
CNR-INFM PolyLab c/o Dipartimento di Chimica e Chimica Industriale, Università di Pisa, via Risorgimento 35, I-56126 Pisa, Italy
3
INSTM, c/o DCCI, Università di Pisa, via Risorgimento 35, I-56126 Pisa, Italy
*
Author to whom correspondence should be addressed.
Received: 21 December 2009 / Revised: 28 January 2010 / Accepted: 23 February 2010 / Published: 24 February 2010
(This article belongs to the Special Issue Nanocomposites of Polymers and Inorganic Particles)
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Abstract

Polymer/metal nanocomposite containing intrinsically anisotropic metal nanostructures such as metal nanorods and nanowires appeared extremely more sensitive and responsive to mechanical stimuli than nanocomposites containing spherical nanoparticles. After uniaxial stretching of the supporting polymer matrix (poly(vinyl alcohol)), the elongated silver nanostructures embedded at low concentration into the polymer matrix (<1 wt % of Ag) assume the direction of the drawing, yielding materials with a strong dichroic response of the absorption behavior. Accordingly, the film changed its color when observed under linearly polarized light already at moderate drawings. The results obtained suggest that nanocomposite films have potential in applications such as color polarizing filters, radiation responsive polymeric objects and smart flexible films in packaging applications.
Keywords: silver nanorods and nanowires; polymer nanocomposite films; dichroic properties silver nanorods and nanowires; polymer nanocomposite films; dichroic properties
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MDPI and ACS Style

Bernabò, M.; Pucci, A.; Ramanitra, H.H.; Ruggeri, G. Polymer Nanocomposites Containing Anisotropic Metal Nanostructures as Internal Strain Indicators. Materials 2010, 3, 1461-1477.

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