When 10:30 AM - 11:30 AM Nov 06, 2015
Where 1571 G.G. Brown
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Understanding and Designing Mechanochemically-Based Functionality in Polymers and at Interfaces


Meredith Silberstein
Cornell University, Sibley School of Mechanical and Aerospace Engineering

Polymer and interface multifunctionality can be designed through the incorporation of chemical groups termed “mechanophores” that have a specific chemical transformation in response to applied force.  Research groups within the mechanochemistry field are working on developing mechanophore-based schemes to change polymer color, alter polymer chain contour length, and trigger crosslinking. Our group is developing tools for predicting the response of mechanophore-linked material systems to externally applied loads.  This talk will focus on two aspects of this work: mechanochemistry within glassy polymers and mechanochemistry at interfaces. For the glassy polymer, we use an optically-trackable mechanophore-linked material (spiropyran-PMMA) to experimentally determine the stress, temperature, and time dependent mechanophore response. We then interpret the results in the context of a finite element implemented constitutive model. For the interfacial system we use both a kinematic and a molecular dynamics approach to extract the critical parameters for activation of mechanophores placed between two substrates. These models are a first step towards a general modeling framework for designing mechanochemically-active materials.

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