Fiber-reinforced composite material, method for manufacturing the same and applications thereof
View Patent ↗There is provided a fiber-reinforced composite material containing fibers having an average fiber diameter of 4 to 200 nm and a matrix material, the composite material having a visible light transmittance of 60% or more at a wavelength of 400 to 700 nm, which is a conversion value based on a thickness of 50 μm. A fiber-reinforced composite material composed of a matrix material and a fiber aggregate impregnated therewith is provided, in which when a segment length of a bright region corresponding to a pore region of the fiber aggregate is represented by L, which is obtained by statistical analysis of a unidirectional run-length image formed from a binary image obtained by binarization of a scanning electron microscopic image of the fiber aggregate, the total length of segments that satisfy L≧4.5 μm is 30% or less of the total analyzed length. A transparent multilayered sheet, a circuit board, and an optical waveguide are provided which use a transparent substrate formed from this fiber-reinforced composite material.
1. A fiber-reinforced composite material comprising: a matrix material; and fibers having an average fiber diameter of 4 to 200 nm, wherein the coefficient of linear thermal expansion is in the range of 0.05×10 −5 to 5×10 −5 K −1 , wherein a light transmittance at a wavelength of 400 to 700 nm is 60% or more, which is a conversion value based on a thickness of 50 μm.
2. The fiber-reinforced composite material according to claim 1 , wherein the fibers are cellulose fibers.
3. The fiber-reinforced composite material according to claim 2 , wherein the cellulose fibers are chemically modified and/or physically modified.
4. The fiber-reinforced composite material according to claim 3 , wherein the cellulose fibers are acetylated.
5. The fiber-reinforced composite material according to claim 2 , wherein the cellulose fibers are bacterial cellulose.
6. The fiber-reinforced composite material according to claim 5 , wherein the bacterial cellulose is not processed by disaggregation.
7. The fiber-reinforced composite material according to claim 6 , wherein the bacterial cellulose has a three-dimensional intersection structure.
8. The fiber-reinforced composite material according to claim 5 , wherein the bacterial cellulose is bacterial cellulose obtained by removing bacteria by an alkaline treatment of a product containing the bacteria and cellulose formed from the bacteria and connected thereto.
9. The fiber-reinforced composite material according to claim 2 , wherein the cellulose fibers are isolated from vegetable fibers.
10. The fiber-reinforced composite material according to claim 9 , wherein the cellulose fibers are fibers obtained by further grinding microfibrillated cellulose fibers.
11. The fiber-reinforced composite material according to claim 1 , wherein the content of the fibers is 10 percent by weight or more.
12. The fiber-reinforced composite material according to claim 1 , wherein the flexural strength is 30 MPa or more.
13. The fiber-reinforced composite material according to claim 1 , wherein the specific gravity is in the range of 1.0 to 2.5.
14. The fiber-reinforced composite material according to claim 1 , wherein the matrix material is an organic polymer, an inorganic polymer or a hybrid polymer containing an inorganic polymer and an organic polymer.
15. The fiber-reinforced composite material according to claim 14 , wherein the matrix material is a synthetic polymer.
16. The fiber-reinforced composite material according to claim 15 , wherein the matrix material is a synthetic resin having a degree of crystallinity of 10% or less and a glass transition temperature of 110° C. or more.