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KR-20260067879-A - Glycol-based organic composite gel through photo-crosslinking and imidization reactions and its manufacturing method

KR20260067879AKR 20260067879 AKR20260067879 AKR 20260067879AKR-20260067879-A

Abstract

The present invention relates to a new composite material that provides elasticity at high temperatures by effectively dispersing polyimide, a highly durable material, into a flexible glycol gel structure through photocrosslinking and thermal imidization reactions, and a method for synthesizing the same.

Inventors

  • 구강희
  • 조규형
  • 김지오

Assignees

  • 울산과학기술원

Dates

Publication Date
20260513
Application Date
20241106

Claims (13)

  1. Glycol gel; and Having a Semi-IPN (Interpenetrating Polymer Network) structure in which polyimide is introduced inside the glycol gel, Organic composite gel.
  2. In paragraph 1, The above glycol gel comprises acrylamide and N,N-dimethylacrylamide. Organic composite gel.
  3. In paragraph 2, The molar ratio of the acrylamide to the dimethylacrylamide is 8:2 to 5:5. Organic composite gel.
  4. In paragraph 1, The above polyimide is derived from polyamic acid (Poly(amic acid)). Organic composite gel.
  5. In paragraph 1, Having rigidity or elasticity characteristics depending on temperature changes, Organic composite gel.
  6. In paragraph 5 The type having an expansion variable temperature of 125 to 200℃, Organic composite gel.
  7. A step of preparing a composite solution by mixing a glycol gel and a polyimide precursor; A step of preparing a composite gel precursor by UV curing the above composite solution; and A step comprising heat-treating the above composite gel precursor Method for manufacturing an organic composite gel.
  8. In Paragraph 7, The above glycol gel comprises acrylamide and N,N-dimethylacrylamide. Method for manufacturing an organic composite gel.
  9. In paragraph 8, The molar ratio of the acrylamide to the dimethylacrylamide is 8:2 to 5:5. Method for manufacturing an organic composite gel.
  10. In Paragraph 7, The above polyimide precursor is a poly(amic acid), Method for manufacturing an organic composite gel.
  11. In Paragraph 7, The content of the above polyimide precursor is 0.5 to 10 wt%, Method for manufacturing an organic composite gel.
  12. In Paragraph 7, The above heat treatment temperature is 100 to 175 ℃, Method for manufacturing an organic composite gel.
  13. In Paragraph 7, The above heat treatment time is 30 to 120 minutes, Method for manufacturing an organic composite gel.

Description

Glycol-based organic composite gel through photo-crosslinking and imidization reactions and its manufacturing method The present invention relates to a new composite material that provides elasticity at high temperatures by effectively dispersing polyimide, a highly durable material, into a flexible glycol gel structure through photocrosslinking and thermal imidization reactions, and a method for synthesizing the same. Polyimide-based materials used as conventional display substrates offer high chemical and heat resistance, but they are generally rigid and lack flexibility, making them unsuitable for advanced applications such as flexible displays. Meanwhile, organic gel-based materials can provide stretchability and flexibility, but conventional organic gels are difficult to apply in fields requiring strong durability due to limitations in high temperature and mechanical stability. Because these two materials have different physical properties, it is difficult to optimize their mutually complementary advantages by simply combining them. Various problems arise during the process of dispersing highly durable materials, such as polyimide, within a flexible gel structure. A typical example is the phenomenon where polyimide does not disperse uniformly and aggregates; this degrades the physical properties of the composite material, limiting the realization of a material that exhibits both flexibility and durability simultaneously. Meanwhile, Korean Patent Application No. 10-2024-0140705 exists as a prior art document in the relevant technical field. Figure 1 illustrates a process flow diagram of a method for manufacturing an organic composite gel according to one embodiment of the present invention. Figure 2 illustrates a schematic diagram of an organic composite gel manufacturing process according to one embodiment of the present invention. Figure 3 illustrates a photographic image according to the monomer molar ratio in a glycol gel according to one embodiment of the present invention. Figure 4 illustrates the results of a solvent compatibility analysis of glycol according to one embodiment of the present invention. Figure 5 shows the FT-IR analysis results of an organic composite gel according to one embodiment of the present invention. Figure 6 illustrates photographic images according to UV irradiation intensity of an organic composite gel according to one embodiment of the present invention. Figure 7 shows photographic images according to the imidization temperature of an organic composite gel according to one embodiment of the present invention. Figure 8 shows photographic images of an organic composite gel according to one embodiment of the present invention over time of imidization. FIG. 9 shows a surface SEM image of an organic composite gel according to one embodiment of the present invention. Figure 10 illustrates the analysis results according to the polyimide precursor content of an organic composite gel according to one embodiment of the present invention. Figure 11 illustrates the results of a chemical resistance analysis of an organic composite gel according to one embodiment of the present invention. FIG. 12 illustrates the results of an analysis of the elasticity variability of an organic composite gel according to one embodiment of the present invention. Hereinafter, embodiments of the present invention are described in detail so that those skilled in the art can easily implement the invention. However, the present invention may be embodied in various different forms and is not limited to the embodiments described herein. An organic composite gel according to one embodiment of the present invention relates to a highly chemically resistant, stretchable, variable gel, and is a composite material having a Semi-IPN (Interpenetrating Polymer Network) structure, and more specifically, is a composite material in which two different types of polymer networks are physically intertwined. More specifically, the organic composite gel may have a glycol gel; and a Semi-IPN (Interpenetrating Polymer Network) structure in which polyimide is introduced into the glycol gel. The glycol gel above contains butanediol, and more specifically, may contain 1,4-butyleneglycol. The glycol gel may comprise acrylamide and N,N-dimethylacrylamide, and more specifically, may comprise acrylamide and N,N-dimethylacrylamide as monomers, and the glycol gel may comprise a molar ratio of acrylamide to dimethylacrylamide of 8:2 to 5:5. In addition, the glycol gel may be one or more selected from the group consisting of polyethylene glycol dimethacrylate (PEGDMA), 2-hydroxyethyl methacrylate (HEMA), polyvinyl alcohol (PVA), and ethylene glycol dimethacrylate (EGDMA). The above polyimide may be introduced from poly(amic acid). In this case, the poly(amic acid) may be synthesized by the polymerization of an aromatic diamine and an aromatic anhydride. The aromatic diamine acts as an electron donor and the aromatic anhydride acts as an