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Surface modifying method of PBO (polybenzoxazole) fiber

A surface modification and fiber technology, which is applied in the field of polymer fiber surface modification, can solve the problems of fiber strength reduction, PBO fiber strength reduction, and environmental pollution, and achieve uniform effects, shortened reaction time, and enhanced reactivity.

Inactive Publication Date: 2012-12-05
NORTHWESTERN POLYTECHNICAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The chemical treatment method will reduce the strength of the fiber and cause environmental pollution; after plasma treatment, although the interface shear strength between the PBO fiber and the resin has increased, the strength of the PBO fiber has decreased slightly; the corona treatment method has no effect on the resin The improvement of the interface properties between the matrix and the fiber is not obvious
The coupling agent method improves the binding force of the two interfacial phases to a certain extent, but the PBO fiber used at high temperature puts forward higher requirements on the heat resistance of the coupling agent
Radiation treatment accelerates aging of PBO composites

Method used

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  • Surface modifying method of PBO (polybenzoxazole) fiber
  • Surface modifying method of PBO (polybenzoxazole) fiber

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] First, add 10g of PBO fiber and 20mg of horseradish peroxidase to a three-necked flask filled with 200ml of phosphate buffer solution and 100ml of dioxane mixture, feed nitrogen, ultrasonically vibrate, and drop 4wt. The aqueous solution of % hydrogen peroxide is 1~50mL in total. After the dropwise addition, react for 2h, take out the fiber, wash it with distilled water, and dry it. Then, dissolve the coupling agent KH-560 in acetone at a concentration of 1.0%, adjust the pH value to 5, soak the PBO fiber at room temperature for 24 hours, wash and dry it with distilled water, and measure the tensile strength of its monofilament It is 4.15GPa, and the pull-out strength of monofilament made of cyanate resin is 8.50MPa.

Embodiment 2

[0025] First, add 10g of PBO fiber and 20mg of horseradish peroxidase to a three-necked flask filled with 200ml of phosphate buffer solution and 100ml of dioxane mixture, feed nitrogen, ultrasonically vibrate, and drop 4wt. The aqueous solution of % hydrogen peroxide is 1~50mL in total. After the dropwise addition, react for 2h, take out the fiber, wash it with distilled water, and dry it. Then, dissolve the coupling agent KH-560 in acetone at a concentration of 1.0%, adjust the pH value to 5, soak the PBO fiber at room temperature for 24 hours, wash and dry it with distilled water, and measure the tensile strength of its monofilament The pull-out strength of monofilament made of bismaleimide resin is 8.81MPa.

Embodiment 3

[0027] First, add 10g of PBO fiber and 20mg of horseradish peroxidase to a three-necked flask filled with 200ml of phosphate buffer solution and 100ml of dioxane mixture, feed nitrogen, ultrasonically vibrate, and drop 4wt. The aqueous solution of % hydrogen peroxide is 1~50mL in total. After the dropwise addition, react for 2h, take out the fiber, wash it with distilled water, and dry it. Then, dissolve the coupling agent KH-550 in acetone at a concentration of 3.0%, adjust the pH value to 5, soak the PBO fiber at room temperature for 24 hours, wash and dry it with distilled water, and measure the tensile strength of its monofilament It is 4.21GPa, and the pull-out strength of monofilament made of epoxy resin is 8.93MPa.

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Abstract

The invention relates to a surface modifying method of a PBO (polybenzoxazole) fiber. The surface modifying method is technologically characterized in that the PBO fiber is modified by adopting a secondary activation method, so as to reduce the damage to the fiber and improve a modification effect. Namely, the surface modification method comprises the following steps of: first, carrying out pretreatment on PBO by utilizing oxydol and an enzyme, introducing an active hydroxyl on the surface of the PBO, and then, condensing with a coupling agent, and introducing different active functional groups on the surface of the PBO, so as to adapt to the requirement of different thermosetting resins and achieve the purpose of improving an interface combination performance between the fiber and the resins. The surface modifying method has the advantages that the surface of the PBO fiber is first treated by the dilute solution of the oxydol; the oxidation action of the enzyme and the cavitation action of an ultrasound are supplemented; the reaction activity is enhanced; the reaction time is shortened; and further, the effect of treating the fiber is more uniform.

Description

technical field [0001] The invention belongs to the field of surface modification of polymer fibers and relates to a method for surface modification of poly-p-phenylenebenzobisoxazole (PBO) fibers. Background technique [0002] PBO fiber is a high-performance aromatic heterocyclic fiber made by PBO through liquid crystal spinning technology. Its tensile strength and elastic modulus are about twice that of aramid fiber, and as a straight-chain polymer, it is considered to have Ultimate modulus of elasticity. The rigid molecular chain also endows PBO fiber with excellent heat resistance, and its heat resistance temperature is 100°C higher than that of aramid fiber. It is an organic fiber with the best comprehensive performance at present. Therefore, PBO fibers are used as reinforcing materials for aerospace and civil advanced composite materials. PBO fiber is known as super fiber. Its main features are high strength, high modulus, light weight, low moisture regain, high temp...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D06M13/513D06M11/50D06M16/00C12S11/00D06M101/30
Inventor 颜红侠张梓军刘超唐玉生梁国正
Owner NORTHWESTERN POLYTECHNICAL UNIV
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