US 12,404,385 B2
Mechanical metamaterial with improved compressive responses
Chien-Yie Tsay, Taichung (TW); and Jiun-Hung Chen, Taichung (TW)
Assigned to Feng Chia University, Taichung (TW)
Filed by Feng Chia University, Taichung (TW)
Filed on Jun. 17, 2022, as Appl. No. 17/842,991.
Claims priority of application No. 111100097 (TW), filed on Jan. 3, 2022.
Prior Publication US 2023/0212372 A1, Jul. 6, 2023
Int. Cl. C08K 3/04 (2006.01); B33Y 80/00 (2015.01); C08K 9/04 (2006.01); B82Y 40/00 (2011.01)
CPC C08K 3/041 (2017.05) [B33Y 80/00 (2014.12); C08K 9/04 (2013.01); B82Y 40/00 (2013.01); Y10T 428/24 (2015.01); Y10T 428/24149 (2015.01); Y10T 428/24174 (2015.01); Y10T 428/24273 (2015.01); Y10T 428/24298 (2015.01)] 6 Claims
OG exemplary drawing
 
1. A mechanical metamaterial with high compressibility comprising a first unit layer and a second unit layer that are repeatedly and alternately stacked or layered in a height direction into a three-dimensional structure, wherein:
the first unit layer comprises multiple first structure units which are repeatedly and regularly composed in a horizontal direction along a plane surface of the first unit layer, and the first structure units include six-bonded chiral structures; the six-bonded chiral structure is a structure having six-bonds extending outwardly and radiating from a center circle at equal angles in the plane surface of the first unit layer;
the second unit layer comprises multiple second structure units which are repeatedly and regularly composed in a horizontal direction along a plane surface of the second unit layer, and the second structure units includes four annular reentrant structures; the four annular reentrant structure is a structure having a three-dimensional square structure formed by connecting four circles or rings;
a width of each bond of the six-bonded chiral structure and a line diameter of the four annular reentrant structure are between 0.10 mm and 0.50 mm;
the mechanical metamaterial comprises an elastic photocurable resin impregnated with carbon nanotubes modified with surface functional groups;
the functional groups include hydroxyl (—OH), aldehyde (—CO—), or carboxyl (—COOH) groups, or a combination thereof; and
the elastic photocurable resin includes polyurethane (PU), thermoplastic polyurethane (TPU), rubber, silicone resin or a combination thereof.