Transparent stretchable substrate and manufacturing method thereof
Disclosed is a method of manufacturing a transparent stretchable substrate according to various embodiments of the present disclosure. The method may include generating a substrate part formed of an elastic material, generating an auxetic including a plurality of unit structures on the substrate part, and generating a fixing part on the substrate part on which the auxetic is generated.
1. A method of manufacturing a transparent stretchable substrate, the method comprising:
generating a substrate part formed of an elastic material;
generating an auxetic having a reentrant structure including a plurality of unit structures, on the substrate part; and
generating a fixing part on the substrate part,
wherein the substrate part, the auxetic, and the fixing part contain the same elastic material, and
wherein
the substrate part and the auxetic further contain a curing agent,
a ratio of the curing agent to the elastic material in the substrate part is a first ratio,
a ratio of the curing agent to the elastic material in the auxetic is a second ratio,
a ratio of the curing agent to the elastic material in the fixing part is a third ratio,
the second ratio is greater than the first ratio and the third ratio, and the first ratio is equal to the third ratio,
the auxetic further includes a plurality of microstructures, each of which is positioned inside a respective unit structure of the plurality of unit structures, and
all of the plurality of microstructures included in the auxetic have the same shape that is consisted of two triangular shapes, which supports an inside of a reentrant shape of the respective unit structure, and minimizes a mechanical deformation distribution generated in response to an external force with respect to one axis.
2. The method of claim 1 , wherein in response to an external force generated with respect to one axis, each of the plurality of unit structures causes deformation of the auxetic with respect to an other axis, and
wherein when the external force is applied to the auxetic with respect to the one axis, a strain related to the other axis is depending on the mechanical strength of the auxetic.
3. The method of claim 2 , wherein the other axis comprises at least one of a first axis located perpendicular to the one axis on the same plane and a second axis based on a plane perpendicular to the same plane.
4. The method of claim 1 , wherein the generating of the auxetic comprises performing a printing process utilizing an elastic material.
5. The method of claim 4 , wherein
the generating of the auxetic further comprises:
performing first curing; and
performing second curing; and
the performing of the second curing proceeds at a higher temperature than the performing of the first curing.
6. The method of claim 5 , wherein the generating of the fixing part comprises:
supplying the fixing part in a liquid state to the substrate part coupled to the auxetic; and
performing third curing, and
the performing of the third curing proceeds at a lower temperature than the performing of the second curing.
7. The method of claim 1 , wherein the auxetic has a higher strength than those of the substrate part and the fixing part.
8. The method of claim 1 , wherein the auxetic has a plurality of partitioned regions, and each of the partitioned regions has different intervals or thicknesses of auxetic structures.