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Polyacrylonitrile (pan) polymers with low polydispersity index (pdi) and carbon fibers made therefrom

A polyacrylonitrile, polymer technology, applied in the chemical characteristics of fibers, household appliances, other household appliances, etc., can solve problems such as difficulties in the development of mechanical properties of fibers

Active Publication Date: 2017-02-22
CYTEC IND INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, there are difficulties in the development of mechanical properties of fibers spun from such PAN

Method used

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  • Polyacrylonitrile (pan) polymers with low polydispersity index (pdi) and carbon fibers made therefrom
  • Polyacrylonitrile (pan) polymers with low polydispersity index (pdi) and carbon fibers made therefrom
  • Polyacrylonitrile (pan) polymers with low polydispersity index (pdi) and carbon fibers made therefrom

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0093] Synthesis of PAN polymer

[0094] PAN polymers were prepared according to the formulations for PAN polymerization shown in Tables 1A-1C.

[0095] Table 1A - Formulations used for PAN polymerization

[0096] components Preparation 1 Preparation 2 Preparation 3 Preparation 4 Acrylonitrile (AN) 99.30 99.30 99.30 99.30 Itaconic acid (ITA) 0.70 0.70 0.70 0.70 CPBZ 0.113％ 0.029％ BDSTD 0.359％* 0.045％

[0097] Table 1B - Formulations used for PAN polymerization

[0098]

[0099]

[0100] Table 1C - Formulations for PAN polymerization

[0101]

[0102] In the above table, CPDTC, CPBZ, and BDSTD are RAFT agents, among which:

[0103] CPDTC = 2-cyano-2-propyl dodecyl trithiocarbonate

[0104] CPBZ = 2-cyano-2-propylbenzodithioate

[0105] BDSTD = bis-dodecylsulfanylthiocarbonyl disulfide

[0106] Note: *Raft agent is used in mole %, based on total monomer.

[0107] Controlled / living radical PAN polymeriz...

Embodiment 2

[0125] Manufacture of white fibers

[0126] Carbon fiber precursors (or white fibers) were formed by wet spinning using PAN polymer made from Formulation 5 as described in Example 1 . White fibers were formed by an air gap spinning process using a PAN polymer made from Formulation 12 as described in Example 1 with a 150 μm spinneret.

[0127] The properties of the white fibers were determined as follows.

[0128] cross-sectional analysis

[0129] Samples of white fiber bundles were dipped in acrylic resin and cured. The cured fiber resin rods were sanded on a grounder using different grades of sander paper to obtain a smooth cross-section. Afterwards, the cross-sectional uniformity of the fiber cross-section was measured under an optical microscope with an image analysis system.

[0130] porosimetry

[0131] For air-gap spinning, fiber samples leaving the coagulation bath were freeze-dried at -60°C, and the freeze-dried samples were tested by mercury porosimetry for poros...

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Abstract

A method for synthesizing polyacrylonitrile (PAN) polymer with a narrow molecular weight distribution is disclosed. The preferred PAN polymer has a PDI (Mw / Mn) of about 2 or less. Such PAN polymer is synthesized by controlled / living radical polymerization using a special RAFT (Reversible Addition-Fragmentation Chain Transfer) agent. Also disclosed is a method for producing carbon fibers from PAN polymer with low PDI.

Description

technical field [0001] The present disclosure generally relates to the synthesis of polyacrylonitrile (PAN) polymers and methods of forming carbon fibers from PAN polymers. Background technique [0002] Due to properties such as high specific strength and stiffness, high chemical resistance, and low thermal expansion, carbon fibers have been widely used commercially in aerospace, sports, and automotive, wind energy, and other energy-saving fields. Typically, carbon fibers are made from polyacrylonitrile (PAN) based polymers. [0003] Radical Polymerization [0004] Traditionally, PAN polymers are made by free radical polymerization methods. In free radical polymerization, a catalyst or initiator first initiates to form starting free radical species. These radical species start to react with monomers to create active centers, forming free monomer radicals. The monomer radicals then react with other monomers to grow molecular chains, thereby forming polymer radicals. [0...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F2/06C08F2/38C08F220/44C08F6/00D01D5/06D01F9/22
CPCC08F2/06C08F2/38C08F220/44C08F6/003D01D5/06C08F2438/03B29K2055/00B29L2031/731B29C48/022D01F9/22C08L33/20C08F120/44C08K5/14C08K5/23C08K5/3725B29D99/0078B29C71/02B82Y40/00
Inventor 唐龙贵A·D·托马斯B·D·哈蒙
Owner CYTEC IND INC
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