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Photopolymerizable compositions

A technology of polymer and dimerization chemistry, applied in holographic image or observable holographic image change, holographic recording media, recording hologram and in the field of holographic sensor, can solve the problem of inapplicable sensor and achieve simplified manufacturing Method, Simplification of Manufacturing Process, Effect of Excellent Diffraction Efficiency

Inactive Publication Date: 2011-04-27
SMART HOLOGRAMS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, photopolymer-based recording media are generally not suitable for sensor

Method used

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Examples

Experimental program
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Embodiment 1

[0211] Example 1: Synthesis of Hydrogel Sensors

[0212] 2-Hydroxyethyl methacrylate (HEMA, 0.25g, 1.92×10 -3 mol), ethylene glycol dimethacrylate (EDMA, 13.8mg, 6.9×10 -5 mol; that is, cross-linking agent), methacrylic acid (MAA, 11.9mg, 1.4×10 -4 mol) and 2-(3,4,-dimethyl-2,5-dioxo-2,5-dihydro-1H-pyrrol-1-yl)ethyl methacrylate (DMIMA, 43.9mg, 1.8×10 -4 mol) was dissolved in 319 μl of 4 wt% 2-dimethoxy-2-phenylacetophenone (DMPA) in DMSO. The solution was poured onto the polyester side of the aluminized polyester sheet. A glass slide modified with methacryloxypropyltriethoxysilane was gently lowered onto the poured solution. Expose slides to UV lamp (approximately 350 nm) for 1 h. UV-initiated radical polymerization and cross-linking lead to the formation of thin hydrogel sensor films attached to the substrate. Glass slides with hydrogel sensor membranes were immersed in deionized (DI) water for 30 minutes, peeled from the polyester / Al flakes, washed with DI water, dri...

Embodiment 2

[0213] Example 2: Synthesis of pH responsive sensors

[0214] The glass slide with the hydrogel sensor membrane prepared in Example 1 was immersed in a 0.4 wt% thioxanthone solution (prepared in DMSO) for 10 minutes, dried under nitrogen flow for 1-2 minutes and heated at 40° C. Dry overnight under vacuum. The hydrogel sensor film was placed on the front surface mirror at an angle of approximately 3° relative to the mirror. The hydrogel sensor film was exposed for 5 seconds using a Nd:YAG laser coupled to a third harmonic generator (355 nm, 165 mJ). This dimerizes the maleimide groups of DMIMA and forms stripes. The streaks here thus consist of photochemically produced products of dimerization of DMI groups. Holographic fringes were recorded in the dry state and spaced λ / 2 nm apart, where λ is the wavelength of the laser used to illuminate the hydrogel sensor film. In this case the fringe spacing is 177 nm. The hydrogel sensor film now has two types of crosslinks: random ...

Embodiment 3

[0225] Example 3: Other Holographic Sensors

[0226]Table 2 shows the composition of nine polymer matrices. The polymer matrices were used to prepare holographic sensors similar to the above exemplary procedures. The holographic sensors respond to pH (buffered solution) or water (acetone / water mixture).

[0227] Table 2:

[0228]

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Abstract

Currently known holographic recording media and sensors have a number of disadvantages, for example, silver halide-based recording media is expensive to produce and unsuitable for use in certain sensor applications, and photopolymer-based recording media make it difficult to record multiple holographic images, thus, generally, rendering them unsuitable for use in sensors. Holographic recording media according to an embodiment of the present invention may comprise a polymer matrix and a chemical group that dimerizes by forming a cyclic bridge through photocycloaddition. These holographic recording media are cost-effective, allow recording of multiple holographic images, and enable production of sensors with controlled observable response to an external stimulus.

Description

[0001] related application [0002] This application claims the benefit of US Provisional Application No. 61 / 124,398, filed April 16, 2008. The entire teachings of this application are incorporated herein by reference. Background of the invention [0003] Currently known holographic recording media and sensors have many disadvantages. For example, in the case of silver halide-based recording media, the silver halide particles must diffuse into the polymer matrix, resulting in cost-effectiveness and environmental unfriendliness. Furthermore, silver halide based recording media are not suitable for some sensor applications. [0004] Photopolymer holograms are usually prepared by diffusing ethylenically unsaturated monomers and photoinitiators in a binder (a cross-linked polymer network such as Poly HEMA hydrogel) or a hydrophilic polymer such as PVA. recording media. The photoresponsive mixture is then exposed to laser light, and this polymerizes the monomers in the adhesive...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/47G02B5/32G03F7/004G03H1/02G11B7/245
CPCG03H1/02G03H2001/0264G11B7/2532G03H2001/186G03F7/027G03H2001/0044G11B7/245G03F7/0388G01N21/4788G03F7/001G11B7/24044
Inventor 普拉迪·帕瑞克安卓恩·马丁·达米恩·霍根
Owner SMART HOLOGRAMS
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