Transparent zeolite-polymer hybrid material with tunable properties
View Patent ↗The invention is about the preparation of novel highly transparent zeolite-doped polymer and zeolites monolayers. External coating of the zeolite crystals by covalently linked functionalized alkoxysilane derivatives allows for an efficient dispersion of the nano zeolite particles into an organic liquid monomer; the following co-polymerisation process leads to a hard, insoluble and transparent material containing said zeolites. Optical properties such as colour, refractive index, Abbe number or photochromism can be fine tuned by simply changing zeolite loading, while transparency is maintained.
1. A transparent zeolite-polymer hybrid material, comprising zeolite crystals dispersed in a transparent polymer A, wherein transparent polymer A is selected from the group consisting of polyolefins, polysiloxanes, polyacrylates, polyvinyls, polyesters, polycarbonates, and polyurethanes, wherein
(i) the zeolite crystals have parallel channels, cavities inside the crystal or both and a crystal length of 20 to 7000 nm,
(ii) the channels, the cavities inside the crystal or both of the zeolite crystals contain guest molecules,
clusters or ions, and
(iii) the zeolite crystals are surface-coated with a polymerizable silane.
2. The zeolite-polymer hybrid material as claimed in claim 1 , wherein the transparent polymer A is made from diethylene glycol bis-allyl carbonate.
3. The zeolite-polymer hybrid material as claimed in claim 1 , wherein the amount of the zeolite crystals dispersed in the transparent polymer A is from 0.1 to 40% by volume, relative to the total volume of the hybrid material.
4. The zeolite-polymer hybrid material as claimed in claim 1 , wherein the guest molecules, clusters or ions are selected from the group consisting of organic dyes, organic pigments, silver halides, silver sulfide, titanium dioxide, silicon dioxide, silicon nitride, silicon clusters and lead sulfide.
5. The zeolite-polymer hybrid material as claimed in claim 1 , wherein the polymerizable silane is a silane containing at least one leaving group, wherein the at least one leaving group is selected from the group consisting of alkoxy and halides, or contains at least one terminal olefinic double bond or contains both a leaving group and at least one terminal olefinic double bond.
6. The zeolite-polymer hybrid material as claimed in claim 5 , wherein the polymerizable silane is trivinyl-ethoxysilane or methacryloxymethyl-trimethoxysilane.
7. An optical article having at least one surface, wherein the at least surface is coated with the transparent zeolite-polymer hybrid material as claimed in claim 1 .
8. The optical article as claimed in claim 7 , wherein the optical article is selected from the group consisting of lenses, eye glasses, special mirrors, filters, polarizer, grids, optical storage, monitors, window panes and float glass.
9. A coated organic or inorganic surface having anti-reflection properties or light wavelength transformation, wherein the coated organic or inorganic surface is coated with the transparent zeolite-polymer hybrid material as claimed in claim 1 .