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Method for preparing prefabricated rod of gradation type plastic optical fiber

A technology of plastic optical fiber and manufacturing method, which is applied in the field of information and communication, and can solve problems such as limiting the length of preform rods

Inactive Publication Date: 2003-05-07
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Because this method is polymerized under the gravity field, the difference in the density of the monomers in the mixed solution causes the difference in the composition of the upper and lower layers of the solution and the influence of the static pressure of the permeate itself, so the composition of the preform produced is different in the length direction. Furthermore, the refractive index distribution of the rod is also different in the length direction, the longer the preform, the greater the difference in the refractive index distribution at both ends, which will limit the length of the preform

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] (1) 90 volumes of methyl methacrylate, 10 volumes of styrene, 0.05% dibenzoyl peroxide and 0.05% chain transfer agent dodecanethiol were stirred in a vacuum at 45°C for 40 hours in a water bath , and then continued to polymerize at 65° C. under vacuum for 20 hours, pulverized and granulated. And after drying at 95 DEG C for 4 hours, use an extruder to extrude at 220 DEG C, the diameter of the die of the extruder is 2.0 mm, and the rotating speed of the winding wheel is adjusted to obtain a thin rod with a diameter of 2.0 mm. Aging the obtained thin rod at 100°C for 30 minutes to eliminate the internal stress left in the silk, and set it aside.

[0030] (2) Preparation of a series of penetrants:

[0031] ① 91 volumes of methyl methacrylate / 9 volumes of styrene;

[0032] ②92 volumes of methyl methacrylate / 8 volumes of styrene;

[0033] ③94 volumes of methyl methacrylate / 6 volumes of styrene;

[0034] ④ 97 volumes of methyl methacrylate / 3 volumes of styrene;

[0035] ⑤ ...

Embodiment 2

[0040] (1) With 100 parts of styrene (St), the dibenzoyl peroxide of 0.1% by weight, the chain transfer agent dodecanethiol of 0.1% by weight were stirred in 55 ℃ of water baths under vacuum for 20 hours, and then Polymerization was continued at 75° C. for 10 hours under vacuum, crushed and granulated. After drying at 95°C for 4 hours, extrude at 230°C with an extruder. The die diameter of the extruder is 2.0 mm. Adjusting the speed of the winding wheel or the size of the die can make a thin rod with a diameter of 2.0 mm. The obtained thin rods were aged at 100°C for 30 minutes to eliminate the internal stress left in the rods, and they were ready for use.

[0041] (2) Preparation of a series of penetrants:

[0042] ①98 volumes of styrene / 2 volumes of methyl methacrylate;

[0043] ②94 volumes of styrene / 6 volumes of methyl methacrylate;

[0044] ③88 volumes of styrene / 12 volumes of methyl methacrylate;

[0045] ④ 80 volumes of styrene / 20 volumes of methyl methacrylate;

...

Embodiment 3

[0050] (1) With 90 volumes of methyl methacrylate (MMA), 10 volumes of styrene (St), the dibenzoyl peroxide of 0.1% by weight, the chain transfer agent dodecanethiol of 0.1% by weight under vacuum Stir in a water bath at 45°C for 40 hours, then continue to polymerize under vacuum at 65°C for 20 hours, pulverize and granulate. And after drying at 95 DEG C for 4 hours, use an extruder to extrude at 220 DEG C, the diameter of the die of the extruder is 2.0 mm, and the rotating speed of the winding wheel is adjusted to obtain a thin rod with a diameter of 2.0 mm. Aging the obtained thin rod at 100°C for 30 minutes to eliminate the internal stress left in the silk, and set it aside.

[0051] (2) Preparation of a series of penetrants:

[0052] ① 91 volumes of methyl methacrylate / 9 volumes of styrene;

[0053] ②92 volumes of methyl methacrylate / 8 volumes of styrene;

[0054] ③94 volumes of methyl methacrylate / 6 volumes of styrene;

[0055] ④ 97 volumes of methyl methacrylate / 3 vo...

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PUM

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Abstract

This invention relates to a process method of a graded plastic fiber prebar which is to process polymer core bar with pretty high refractive index to be swelled and infiltrated in monomer solution. According to scatter theory, small molecules will form concentration gradient on the polymer bar radius then turn to refractive index gradient after polymerization. Monomer mixed proportion is to be altered in solution and prepare serial monomer solution to increase refractive index components steadily then the polymer bar will be swelled and infiltrated in monomer solution and solidified after polymerization. After finishing the above steps and polymerization, plastic fiber prebar is to be processed with refractive index similar to parabola distributed along radius.

Description

Technical field: [0001] The invention relates to a method for manufacturing a graded plastic optical fiber preform rod. The refractive index distribution of the preform rod along the radial direction is parabolic, which is mainly used in optical communication and belongs to the technical field of information communication. technical background: [0002] The application of step-type plastic optical fiber in local area network is limited due to its small transmission bandwidth, while graded-type plastic optical fiber has attracted extensive attention because of its huge transmission bandwidth. [0003] At present, countries such as Japan, South Korea, and the United States have applied for a number of patents related to the manufacture of graded plastic optical fiber preforms in China, but there are not many patents that are truly original and innovative in this regard in my country. [0004] The patent (notification number CN 1214454A) applied by Japan in China discloses the ...

Claims

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Application Information

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IPC IPC(8): C08F265/00G02F1/19
Inventor 李忠辉殷宗敏薛敏钊
Owner SHANGHAI JIAO TONG UNIV
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