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Fluoroacrylate copolymer for optical waveguide and preparation method thereof

A technology of acrylate and methyl methacrylate, which is applied in the field of fluorine-containing acrylate copolymers for optical waveguides and its preparation, can solve the problems of increased crystallinity and reduced light transmittance of polymers, and achieves low crystallinity and reduced Effects of transmission loss and high light transmittance

Inactive Publication Date: 2012-05-09
DONGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Relevant literature has proved that if the side chain of the acrylate monomer is too long, especially if it is more than 5 carbon atoms, it will form an orderly accumulation of side chains, resulting in an increase in the crystallinity of the polymer and a decrease in light transmittance.

Method used

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  • Fluoroacrylate copolymer for optical waveguide and preparation method thereof
  • Fluoroacrylate copolymer for optical waveguide and preparation method thereof
  • Fluoroacrylate copolymer for optical waveguide and preparation method thereof

Examples

Experimental program
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Embodiment 1

[0027] Use alkali washing method to remove the polymerization inhibitor (hydroquinone) in the monomer, distill under reduced pressure, recrystallize the initiator, check the airtightness of the reactor, follow the method of methyl methacrylate / trifluoroethyl methacrylate The molar ratio is 9: 1 to measure the monomer, the volume of methyl methacrylate is 34.8091ml, the volume of trifluoroethyl methacrylate is 5.1909ml, initiator (azobisisobutyronitrile) 42mg, chain transfer agent (n. Dithiol) 89mg, these reaction raw materials are added reaction still, seal, take out oxygen, then charge into nitrogen, remove oxygen operation and repeat three times, finally pass into nitrogen. Start to heat up, the first stage temperature is 70°C, and the time is 1 hour; the second stage temperature is 50°C, and the time is 24 hours; the third stage temperature is 100°C, and the time is 3 hours, the reaction is completed, and the polymer product is obtained.

[0028] The concrete index of polym...

Embodiment 2

[0032] Using the same polymerization process as in Example 1, but with different molar ratios of the two comonomers, a methyl methacrylate / trifluoroethyl methacrylate molar ratio of 8:2, a fluorine-containing acrylic acid with excellent properties was obtained ester copolymer.

Embodiment 3

[0034] Using the same polymerization process as in Example 1, but with different molar ratios of the two comonomers, a methyl methacrylate / trifluoroethyl methacrylate molar ratio of 7:3, a fluorine-containing acrylic acid with excellent properties was obtained ester copolymer.

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Abstract

The invention relates to a fluoroacrylate copolymer for optical waveguide and a preparation method thereof, wherein methyl methacrylate is selected as a first monomer, and trifluoroethyl methacrylate is selected as a second monomer. The preparation method provided by the invention comprises the following steps of: adding two monomers, namely, the methyl methacrylate and the trifluoroethyl methacrylate into a reaction kettle; adding an initiator and a chain transfer agent; firstly polymerizing for 1-4 h at a temperature of 70-80 degrees centigrade; secondly polymerizing for 24 h at a temperature of 50 degrees centigrade; and thirdly polymerizing for 3 h at a temperature of 100 degrees centigrade, thereby obtaining the finished product. The copolymer provided by the invention has the characteristics of low crystallinity and high light transmittance; compared with the conventional optical polymer PMMA (polymethyl methacrylate), the copolymer provided by the invention has lower refractive index and the characteristic of regulatability; meanwhile, as C-F bonds are introduced in the copolymer, the transmission loss of common communication wavebands in a polymer medium can be reduced, so that the red shift of loss windows occurs.

Description

technical field [0001] The invention belongs to the technical field of polymer optical waveguide materials, in particular to a fluorine-containing acrylate copolymer for optical waveguides and a preparation method thereof. Background technique [0002] How to reduce the loss of polymer optical waveguide materials to increase their transmission distance and bandwidth has always been one of the main purposes of optical communication research. Currently on the market, the polymer optical waveguide material is mainly polymethyl methacrylate (PMMA). PMMA is a widely used optical material with low crystallinity, high light transmittance in the visible light band, reaching 92%, and good weather resistance. However, PMMA contains a large number of C-H bonds, which cause high-frequency harmonic absorption of C-H bonds in the three common communication bands, so that when light waves propagate in PMMA, they cause excessive loss and fast attenuation. [0003] There are two main metho...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F220/14C08F220/22C08F2/02G02B1/04
Inventor 滕翠青毛植森余木火曹凯祈自福詹亚歌
Owner DONGHUA UNIV