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A modification method of heterocyclic aramid fiber and modified heterocyclic aramid fiber

A heterocyclic aramid fiber modification technology, which is applied in the field of polymer materials, can solve the problems of modulus drop and destruction of PPTA aggregate structure, etc., achieves the improvement of compressive strength and interlayer shear strength, simple and convenient operation, and extremely high sexual effect

Active Publication Date: 2020-04-21
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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  • A modification method of heterocyclic aramid fiber and modified heterocyclic aramid fiber
  • A modification method of heterocyclic aramid fiber and modified heterocyclic aramid fiber
  • A modification method of heterocyclic aramid fiber and modified heterocyclic aramid fiber

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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

A method for modifying heterocyclic aramid fibers, which relates to the technical field of polymer materials, mainly aims at heterocyclic aramid fibers containing imidazole structures, and introduces bromomethylbenzoic acid into the molecules of fibers through nucleophilic substitution of imidazole nitrogen atoms chain, and then decarboxylated at high temperature to form a cross-linked structure. Then, at low temperature, nucleophilic substitution reaction occurs again with bromomethylbenzoic acid. The low temperature avoids the decarboxylation reaction, and can retain a large amount of carboxyl groups on the surface of the fiber, improving the polarity of the fiber surface. The modification method is simple and convenient to operate, does not require high equipment, has mild reaction conditions, does not cause the degradation of the heterocyclic aramid fiber, and improves the compressive strength and the interlayer shear strength of the heterocyclic aramid fiber. A modified heterocyclic aramid fiber has higher compressive strength and shear strength than the existing heterocyclic aramid fiber. The preparation process of the modified heterocyclic aramid fiber does not need to change its existing polymerization and spinning processes, the modification process is simple, the cost is low, and it is 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 Patents(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