Modifying method for heterocycle aramid and modified heterocycle aramid

A heterocyclic aramid fiber and modified technology, applied in the field of polymer materials, can solve the problems of destroying the PPTA aggregated state structure and decreasing the modulus, achieving simple and convenient operation, improved compressive strength and interlaminar shear strength, and improved extreme sexual effect

Active Publication Date: 2019-03-01
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, due to the large side group of this monomer, its introduction destroys the original aggregated structure of PPTA, making its tensile strength and modulus drop significantly.

Method used

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  • Modifying method for heterocycle aramid and modified heterocycle aramid
  • Modifying method for heterocycle aramid and modified heterocycle aramid
  • Modifying method for heterocycle aramid and modified heterocycle aramid

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] This embodiment provides a modified heterocyclic aramid fiber, the preparation method of which comprises:

[0040] S1. Under an inert atmosphere, add 0.5g of BBA to 100ml of DMAc and 100ml of acetonitrile respectively, and stir until the BBA is dissolved. Then, 0.5 g of heterocyclic aramid fiber (monomer molar ratio TPC:PABZ:PDA=10:5:5) was added to the DMAc / BBA solution to swell for 30 minutes. Then statically heat-treat at 320° C. for 30 minutes to obtain a cross-linked heterocyclic aramid fiber.

[0041] S2. The above-mentioned cross-linked heterocyclic aramid fiber was swelled in an acetonitrile / BBA solution for 30 minutes, and then heat-treated at 230° C. for 30 minutes to obtain a modified heterocyclic aramid fiber.

[0042] The XPS spectrum of the modified heterocyclic aramid fiber provided by the present embodiment is as follows: figure 1 As shown, the peak of the amide bond and the peak of the carboxyl group can be seen from the XPS spectrum, indicating that ...

Embodiment 2

[0044] This embodiment provides a modified heterocyclic aramid fiber, the preparation method of which comprises:

[0045] S1. Under an inert atmosphere, add 0.3g of BBA to 100ml of DMAc and 100ml of acetonitrile respectively, and stir until the BBA is dissolved. Then 0.5 g of heterocyclic aramid (TPC:PABZ:PDA=10:7:3) was added to the DMAc / BBA solution to swell for 45 minutes. Then statically heat-treat at 320° C. for 30 minutes to obtain a cross-linked heterocyclic aramid fiber.

[0046] S2. Swell the above-mentioned cross-linked heterocyclic aramid fiber in the acetonitrile / BBA solution for 30 minutes. Then heat treatment at 230° C. for 0.5 h to obtain a modified heterocyclic aramid fiber.

Embodiment 3

[0048] This embodiment provides a modified heterocyclic aramid fiber, the preparation method of which comprises:

[0049] Under an inert atmosphere, 0.4g of BBA was added to 100ml of NMP and 100ml of acetonitrile respectively, and stirred until the BBA was dissolved. Then, 0.5 g of heterocyclic aramid (TPC:PABZ:PDA=10:6:4) was added to the NMP / BBA solution to swell for 30 minutes. Then statically heat-treat at 310° C. for 30 minutes to obtain a cross-linked heterocyclic aramid fiber.

[0050] S2. Swell the above-mentioned cross-linked heterocyclic aramid fiber in the acetonitrile / BBA solution for 40 minutes. Then heat treatment at 250° C. for 15 minutes to obtain a modified heterocyclic aramid fiber.

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Abstract

The invention provides a modifying method for heterocycle aramid and relates to the technical field of high polymer materials. The modifying method is mainly specific to the heterocycle aramid containing an imidazole structure. Bromomethylbenzoic acid is introduced to a molecular chain of a fiber, in the manner of nucleophilic substitution of imidazole nitrogen atoms; and then, high-temperature decarboxylation coupling is performed, so as to form a crosslinking structure; lastly, nucleophilic substitution reaction occurs between the fiber and the bromomethylbenzoic acid under low temperature;low temperature can avoid decarboxylation reaction, a plenty of carboxyl groups are remained on the fiber surface and the polarity of fiber surface is promoted. The modifying method has the advantagesof simple and convenient operation, low requirement for equipment, gentle reaction conditions, incapability of triggering degradation of heterocycle aramid and capability of promoting both compression strength and interlayer shear strength of heterocycle aramid. A modified heterocycle aramid, compared with the present heterocycle aramid, has higher compression strength and shear strength. The present polymerization and spinning processes need not be changed during the preparation process of the modified heterocycle aramid; the modifying process is simple; the cost is low; the modifying methodis suitable for large-scale industrial production.

Description

technical field [0001] The invention relates to the technical field of polymer materials, in particular to a method for modifying a heterocyclic aramid fiber and the modified heterocyclic aramid fiber. Background technique [0002] Para-aramid fibers represented by Kevlar and Twaron (called aramid II in my country) have excellent mechanical properties, heat resistance, chemical stability and fatigue resistance. It has been widely used in national defense, aerospace, optoelectronics, offshore engineering and other fields. However, in the existing aramid fibers, since the macromolecular chains are highly oriented along the fiber axis, the lateral interaction between the molecular chains is relatively weak. And there are few polar groups on the surface of the fiber, and the surface is chemically inert. This leads to its unsatisfactory compressive properties and composite properties, which limits its application in the field of fiber-reinforced composite materials to a certain...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D06M13/21D06M101/36
CPCD06M13/21D06M2101/36
Inventor 刘向阳戴宇罗龙波王旭杨成刘昌莉
Owner SICHUAN UNIV
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