Keyword Suggestions

Results
 
 
Account Login
 
 
 
 
 

Library Navigation

 
 

Browse Meetings

 
 
 
B15.10 - A Conductive Propylene-Based Elastomer with Electrically Tunable Stiffness 
Date/Time:
December 4, 2014   11:00am - 11:15am
 
Speaker:
 
Taxonomy
 
 
 
 
 
Share:
 

Thermal approaches for rigidity tunable composite design have been limited due to the relatively long activiation time. In this work, rapid and reversible changes in the mechanical rigidity of an elastic composite are accomplished with a conductive propylene-based elastomer (cPBE) embedded in an electrically and thermally insulating sheet of poly(dimethylsiloxane) (PDMS). These rigidity-tuning composites are activated by passing electrical current through the cPBE, which increases in temperature through resistive (i.e. ohmic or “Joule”) heating. Because of its relatively low Vicat softening point, only moderate current is required to rapidly heat and soften the rubber. At room temperature, the cPBE has an elastic (Young’s) modulus of 175.5 MPa and is observed to soften into a viscoplastic fluid when heated above 75 oC. Depending on the area fraction of cPBE, a composite can exhibit reversible changes in effective tensile modulus between ~0.1 and 100 MPa. Moreover, the cPBE’s unique combination of conductive, elastomeric, and thermoplastic properties eliminates the need for external Joule heating and allows for rapid activation in seconds. Lastly, we demonstrate the potential for soft robotics integration with an inflatable bending actuator that contains several cPBE-PDMS “tendon” elements. Selectively activating the tendons controls the neutral axis and direction of bending during inflation.
 


 
 
Average Rating: (No Ratings)
  Was great, surpassed expectations, and I would recommend this
  Was good, met expectations, and I would recommend this
  Was okay, met most expectations
  Was okay but did not meet expectations
  Was bad and I would not recommend this
 



Submit
 
Performance Enhancement of Pentacene Based Organic Field-Effect Transistor through DNA Interlayer
Semiconducting Polymer-Dipeptide Nanostructures by Ultrasonically-Assisted Self-Assembling
DNA as a Molecular Wire: Distance and Sequence Dependence
Structure-Property Relationship in Biologically-Derived Eumelanin Cathodes Electrochemical Energy Storage
Artificial Physical and Chemical Awareness (proprioception) from Polymeric Motors