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Environmentally-controlled Microtensile Testing of Mechanically-adaptive Polymer Nanocomposites for ex vivo Characterization
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Stimuli-responsive mechanically adaptive polymer nanocomposites.

Kadhiravan Shanmuganathan1, Jeffrey R Capadona, Stuart J Rowan

  • 1Department of Macromolecular Science and Engineering, Case Western Reserve University, 2100 Adelbert Road, Cleveland, Ohio 44106, USA.

ACS Applied Materials & Interfaces
|March 23, 2010
PubMed
Summary

New nanocomposites with tunicate cellulose whiskers change mechanical properties in physiological conditions. Their mechanical response depends on polymer matrix properties and swelling, offering tunable material behavior.

Keywords:
Cellulose nanofibersbiomimeticmechanically adaptivepolymer nanocompositeresponsive

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Area of Science:

  • Materials Science
  • Polymer Science
  • Nanotechnology

Background:

  • Stimuli-responsive materials are crucial for advanced applications.
  • Biomimetic materials offer unique properties inspired by nature.
  • Understanding polymer matrix effects on nanocomposite behavior is essential.

Purpose of the Study:

  • To develop novel biomimetic stimuli-responsive nanocomposites.
  • To investigate the influence of polymer matrix properties (hydrophobicity, Tg) on water-induced mechanical changes.
  • To explore the use of tunicate cellulose whiskers as reinforcing agents.

Main Methods:

  • Preparation of nanocomposites by incorporating tunicate cellulose whiskers into poly(vinyl acetate) (PVAc) and poly(butyl methacrylate) (PBMA).
  • Mechanical characterization (tensile storage modulus, E') below and above the glass-transition temperature (Tg).
  • Evaluation of mechanical response upon immersion in artificial cerebrospinal fluid (ACSF) at physiological conditions (37°C).

Main Results:

  • Nanocomposites showed significantly enhanced modulus (E') above Tg compared to below Tg.
  • All materials exhibited a decrease in E' when exposed to ACSF, with PVAc showing a more dramatic reduction than PBMA.
  • The extent of mechanical change correlated with ACSF swelling, influenced by whisker content, temperature, and matrix polarity (PVAc > PBMA).

Conclusions:

  • The mechanical morphing of these nanocomposites is governed by matrix swelling and nanoparticle interactions.
  • The findings are consistent with percolation and Halpin-Kardos models.
  • These materials offer tunable mechanical properties for stimuli-responsive applications.