Pressure sensitive polymer films with reversible porosity

Description:

Project ID:  D2018-23

 

Background

Pressure sensing is used in the automobile, packaging, food, and pharmaceutical industries. Commercially available pressure-sensing films rely on a reaction created when microcapsules burst upon applied pressure. However, these films only function in a limited temperature range and do not work in wet or oily environments.

 

Invention Description

Researchers have developed a pressure-sensitive film that transitions from opaque to transparent with increasing pressure. The films are made of thermoplastic elastomers containing a porous microstructure. Stress-induced porosity transition can be programed to occur within a range of 0.62 MPa to 60 MPa. Upon transition these pores shrink, allowing light to be transmitted through the films without any scattering. Once the stress is removed, these pores remain small keeping the film transparent, allowing for an optical indication of pressure/stress. The pressure sensitive films can be re-activated to their initial opaque state for multiple cycles.

 

Applications

-       Pressure measurement

-       Pressure mapping

-       Pressure balance

-       Composite parts of thermal insulator

-       Reconfigurable porous polymers/processes

 

Advantages

-       Low cost

-       Optically quantifiable

-       Accurate measurements taken between 10 and 100 C

-       Can be used inside water or oil.

-       Re-processable multiple times

 

IP Status:       Patent pending

 

Patent Information:
Category(s):
Engineering
For Information, Contact:
Katherine Pollard
Licensing Associate
The University of Toledo
419-530-6228
katherine.pollard@utoledo.edu
Inventors:
Syed Reza Rizvi
Sheikh Rasel
Emran Bhulyan
Navid Namdari
Bilal Nizar Halim
Keywords:
Film
Foam
Porosity
Pressure
Temperature