Material systems and methods of manufacture for auxetic foams
AssigneeThe Florida State University Research Foundation, Inc.
InventorsChangchun Zeng, Yan Li
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Abstract
A novel material for producing auxetic foams is disclosed. The material comprises a multiphase, multicomponent polymer foam with a filler polymer having a carefully selected glass transition temperature. Novel methods for producing auxetic foams from the material are also disclosed that consistently, reliably and quickly produce auxetic polyurethane foam at about room temperature (25° C.). This technology overcomes challenging issues in the large-scale production of auxetic PU foams, such as unfavorable heat-transmission problem and harmful organic solvents.
Claims17
(canceled)
The material system of claim 21, wherein the filler polymer comprises styrene acrylonitrile copolymer.
3-8. (canceled)
The material system of claim 29, wherein the compressed gas is primarily carbon dioxide or nitrogen.
(canceled)
(canceled)
The material system of claim 21, wherein varying a concentration of the filler polymer in the foam causes variation of mechanical properties of the foam.
13-20. (canceled)
A material system for the production of auxetic foam, comprising:
- a bulk matrix, comprising:
- a soft domain comprising a polymer chain and having a first glass transition temperature;
- a hard domain covalently or non-covalently linked to the polymer chain of the soft domain and having a thermal transition temperature greater than the first glass transition temperature;
- and
- a filler polymer dispersed in the bulk matrix and having a second glass transition temperature greater than the first glass transition temperature and less than the thermal transition temperature.
Dependencies are inferred from the claim text.