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US 10,647,037 B2Granted
Mechanical reticulation of polymeric-based closed cell foams
AssigneesLawrence Livermore National Security, LLC, The Texas A&M University System
InventorsJennifer N. Rodriguez, Duncan J. Maitland, Thomas S. Wilson
Life of this patent
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Abstract
Polymeric based closed cell foams, such as shape memory polymer foams, contain bubbles. Making these bubbles continuous is called reticulation. Disclosed are embodiments of a device and method to controllably reticulate polymer-based closed cell foams by puncturing the membranes of these polymer-based closed cell foams.
Claims21
A system comprising:
- a polyurethane shape memory polymer (SMP) foam having first and second states;
- first and second cells, included in the SMP foam, which directly contact each other;
- wherein (a)(i) the first and second cells share and directly contact a ring of struts that provide structural support for the first and second cells, (a)(ii) a membrane directly contacts the ring of struts, and (a)(iii) the membrane is partially reticulated but not fully reticulated;
- wherein the partially reticulated membrane includes:
- (b)(i) a void that forms a fluid path between the first and second cells, (b)(ii) an interface, between the partially reticulated membrane and the void, which is rough and uneven;
- wherein the SMP foam includes a composition, the composition including at least one of:
- (c)(i) N,N,N′,N′-tetrakis (2-hydroxypropyl) ethylenediamine (HPED), triethanolamine (TEA), and hexamethylene diisocyanate (HDI) with TEA contributing a higher molar ratio of hydroxyl groups than HPED;
- (c)(ii) HPED, TEA, and trimethylhexamethylenediamine (TMHDI) with HPED contributing a higher molar ratio of hydroxyl groups than TEA, or (c)(iii) HPED, glycerol, pentanediol, and HDI.
5 more elements
A system comprising:
- a polyurethane shape memory polymer (SMP) foam having first and second states;
- first and second cells, included in the SMP foam, which directly contact each other;
- wherein (a)(i) the first and second cells share and directly contact a ring of struts that provide structural support for the first and second cells, (a)(ii) a membrane directly contacts the ring of struts, and (a)(iii) the membrane is partially reticulated but not fully reticulated;
- wherein the partially reticulated membrane includes:
- (b)(i) a void that forms a fluid path between the first and second cells, (b)(ii) an interface, between the partially reticulated membrane and the void, which is shredded;
- wherein the SMP foam includes a composition, the composition including at least one of:
- (c)(i) N,N,N′,N′-tetrakis (2-hydroxypropyl) ethylenediamine (HPED), triethanolamine (TEA), and hexamethylene diisocyanate (HDI) with TEA contributing a higher molar ratio of hydroxyl groups than HPED;
- (c)(ii) HPED, TEA, and trimethylhexamethylenediamine (TMHDI) with HPED contributing a higher molar ratio of hydroxyl groups than TEA, or (c)(iii) HPED, glycerol, pentanediol, and HDI.
5 more elements
Dependencies are inferred from the claim text.