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In situ polymerization one-dimensional electric high purity carbon/polyacrylonitrile composite polymer

A composite polymer and polyacrylonitrile technology, applied in the field of composite polymers, to achieve the effects of easy control of process conditions, good dispersion performance, and good process performance

Inactive Publication Date: 2008-11-26
XIAMEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The reports of reinforcing pitch-based carbon fibers and polyacrylonitrile-based carbon fibers with carbon nanotubes reported abroad also all adopt the filling method (R.Andrews, D.Jacques, A.M.Rao, T.Rantell, and F.Derbyshire.Nanotubecomposite carbon fibers , Applied Physics Letters, 1999, 75(9): 1329-1331; [8] T.Cho, Y.S.Lee, R.Rao, A.M.Rao, D.D.Edie, A.A.Ogale.Structure of carbon fiber obtain from nanotube-reinforced mesophase pitch, Carbon, 2003, 41:1419-1424), and there is no report of in-situ polymerization to prepare polyacrylonitrile-based composite polymer

Method used

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  • In situ polymerization one-dimensional electric high purity carbon/polyacrylonitrile composite polymer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Example 1: 5 parts of carbon nanotubes (average diameter 0.015 μm, average length 10 μm) were used in a mixed solution of 95 parts of acrylonitrile, 4 parts of methyl acrylate, 1 part of itaconic acid and 300 parts of dimethyl sulfoxide Ultrasonic dispersion 4h, so that the carbon nanotubes dispersed evenly. Transfer these mixtures to a reaction kettle, stir with an electric mechanical stirrer (rotating speed 560r / min) for 20min under the protection of nitrogen, add 2 parts of azobisisobutyronitrile as an initiator, and heat the reaction kettle to 65°C after the dissolution is complete , and react at constant temperature for 24h to obtain a black composite polymer solution. The reaction product was transferred to a vacuum distillation device, and the unreacted acrylonitrile and methyl acrylate monomers were evaporated under reduced pressure at a vacuum degree of 150 mmHg and a temperature of 50°C. Then the temperature is raised to 60°C and after defoaming and filtering...

Embodiment 2～9

[0020] Examples 2-9: The preparation method is similar to that of Example 1, but the reaction conditions are as shown in Table 1.

[0021] Table 1 Embodiment 2~9 solution polymerization reaction conditions and the spinning performance of composite polymer

[0022]

composition

monomer ratio

carbon nanotubes

reaction medium

Initiator

molecular weight

Regulator

Reaction temperature

degree(℃)

when reacting

room (h)

Product spinning

silk properties

implement

Example 2

AN 100

SWNT 5

DMF 150

AIBN 3

0

60

48

Difference

implement

Example 3

AN 100, MA

15

MWNT 1

DMAc 900

BPO 1

IPA 3

72

36

it is good

implement

Example 4

AN 100,

MAA 3

VGCF 5 ...

Embodiment 10

[0025] Example 10: 1 part of sodium dodecylsulfonate, 2 parts of hydrogen peroxide and 1 part of ascorbic acid were dissolved in 300 parts of water in a reactor with electric stirring (rotating speed 600 r / min). Add 5 parts of vapor-grown carbon fibers (average diameter 0.150 μm, average length 10 μm) to a mixed solution of 95 parts of acrylonitrile, 4 parts of methyl methacrylate, and 1 part of acrylic acid, and disperse them with ultrasonic waves for 4 hours. And continue to stir for 10min. Raise the temperature of the reactor to 50° C. and keep it constant, and react monomers such as acrylonitrile for 8 hours to obtain a black precipitate. Filter the precipitate, wash it twice with 1000 parts of cold water, hot water (about 70°C), and ethanol successively, each time for 20 minutes, put it into a 60°C vacuum oven and dry it for 24 hours after suction filtration, and obtain the vapor phase grown carbon fiber / polyacrylonitrile composite polymer. Dissolve 18 parts of dry vapo...

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Abstract

the invention discloses a preparing method of composite priority through CVD method, which comprises the following parts: 100 wt% acrylon, 1-25 wt% one-dimension conductive high-purity carbon, 0-15 wt% comonomer, 1-3 wt% initiator, 0-1 wt% disperser, 0-3 wt% molecular weight modifier and 150-900 wt% reacting dielectric. One-dimension conductive high-purity carbon is dispersed in the acrylon to polymerize on the one-dimension conductive high-purity carbon, which removes non-reacted acrylon, comonomer and initiator.

Description

technical field [0001] The invention relates to a composite polymer, in particular to a method for preparing a composite precursor, which is mainly used for preparing a carbon core for continuous fibers by chemical vapor deposition (Chemical Vapor Dposition, CVD for short). Since the surface of this composite polymer has the same composition as bulk polyacrylonitrile, it improves the compatibility of one-dimensional conductive high-purity carbon and polyacrylonitrile, which is beneficial to the one-dimensional conductive high-purity carbon in polyacrylonitrile solution. Uniform dispersion and dispersion stability. The carbon core prepared with this composite precursor is especially suitable as the basic core material of continuous silicon carbide (silicon carbide, SiC for short) fiber by CVD method. Background technique [0002] The SiC fiber prepared by the CVD method is to use a conductive continuous monofilament as the core material (or called a deposition carrier), so t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F20/44C08F2/44C08F2/04C08K3/04C08L33/20
Inventor 陈立富周花董炎明张立同张颖兰琳
Owner XIAMEN UNIV
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