Department of Chemical Engineering, Texas Tech University, Lubbock, TexasWelcome to Greg McKenna's 'Polymers and Condensed Matter Physics Group'

Department of Chemical Engineering

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NIST-TTU Torsional Dilatometer

This rheometer was built by Duran and Mckenna with the aim of measuring the volume change during stress relaxation. It has a strain gauge transducer with 1000 N Normal force and 39Nm torque capacity.  The mercury immersion dilatometer was replaced by  a  Laser scan micrometer in order to avoid the use of mercury immersion dilatometry for safety and health reasons.

Specs of laser scan micrometer LSM 501-H:

• Measuring range of 0.05 to 10mm

• Resolution of the device is 10nm

Experimental application

1. Normal force responses in polymer glasses

Related Publications

1. A. Flory, G. B. McKenna, “Microscopic origins of the normal force responses of glassy polymers in the subyield range of deformation”, Macromolecules, 38(5), 1760 (2005).

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Last updated: 06/09/09.