Michael Hardister

Michael Drew Hardister, age 63, Wildwood, FL View Details

Cities: Wildwood FL, Fort Collins CO Possible Relatives: Debra L Hardister, Mary Gilmore Hardister, Michele D Hardister

Michael James Hardister, age 29, Hot Springs Village, AR View Details

Cities: Wildwood FL, Fort Collins CO Possible Relatives: Debra L Hardister, Mary Gilmore Hardister, Michele D Hardister

Michael Wayne Hardister, age 77, Salisbury, NC View Details

Locations: Wildwood FL, Fort Collins CO Possible Relatives: Debra L Hardister, Mary Gilmore Hardister

Michael Drew Hardister, age 63, Wildwood, FL View Details

Locations: Wildwood FL, Fort Collins CO Possible Relatives: Debra L Hardister, Mary Gilmore Hardister

Michael L Hardister, age 50s, Memphis, TN View Details

Locations: Memphis TN, Cordova TN

Michael Drew Hardister, age 60s, Wildwood, FL View Details

Locations: Wildwood FL, Fort Collins CO, Loveland CO Possible Relatives: Mary G Hardister, Robin M Hardister, Timothy James Hardister

Michael Hardister View Details

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Michael D Hardister View Details

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Exploring the thermodynamics of a rubber band

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This allows students to experimen-tally check the predictions of the entropic spring model for elastomers and observe that the entropy does indeed decrease as a rubber band is stretched.

9.3: Polymer Elasticity and Force–Extension Behavior

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The Entropic Spring To extend a polymer requires work. We calculate the reversible work to extend the macromolecule from the difference in free energy of the chain held between the initial and final state. This is naturally related to the free energy of the system as a function of polymer end-to-end distance:

Rubber band experiment - Wikipedia

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The rubber band experiment can be modeled as a thermodynamic cycle as shown in the diagram. The stretching of the rubber band is an isobaric expansion (A → B) that increases the energy but reduces the entropy (this is a property of a rubber bands due to rubber elasticity).

Entropy of a Rubber Band - Chemistry

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When stretched the polymer strands should be more aligned and straighten out along the direction of the stretching. When you relax it the strands go in all directions, or become more disordered. So the entropy increases (the entropy change is …

spring - How much of elastic energy is stored as entropy?

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There are two cases of elastic stretching: springs and rubber. When you streach a spring or a piece of rubber both absorb some energy as Entropy (S) and some as plain energy (U)

Lecture 25 - Simon Fraser University

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This is true even for a freely-jointed (random-walk) chain where all configurations have the same energy, so there is ZERO energy involved in the stretching! It is entirely an entropic effect.

Thermodynamics - the entropy spring

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Consider what happens when you stretch a rubber band or a balloon. We know that the rubber will stretch a long way before it breaks, but we ought to be able to explain why it behaves the way it does.

Changes of Activation Energy during Deformation of Rubber

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In this section, where the changes in conformations of the stretched chains are large, there is a predominance of the process of growth of the entropic resistance to the deformation of the specimen with an increase in activation energy.

Microsoft PowerPoint - TP-RubberBandThermodynamics.pptx

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When a rubber band is stretched rapidly, the total entropy change is negative, since the rubber band does not stretch by itself (we must stretch it). The entropy change of the surrounding air is positive, since heat is given off.