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A method for modifying the compressive properties of PBO fibers

A fiber and performance technology, applied in the field of PBO fiber modification, can solve the problems of microfiber peeling damage, poor compression performance, etc., and achieve the effect of reliable quality, stable process and enhanced interaction

Inactive Publication Date: 2015-11-11
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The present invention aims to solve the problem that the PBO fiber prepared by the existing method has its unique microfiber structure mainly connected by secondary chemical bonds of van der Waals force, which causes the PBO fiber to buckle and deform easily when bearing axial compressive stress. The microfiber peeling damage shows the defect of poor compression performance, and a method for modifying the compression performance of PBO fibers is provided

Method used

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  • A method for modifying the compressive properties of PBO fibers
  • A method for modifying the compressive properties of PBO fibers

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specific Embodiment approach 1

[0013] Embodiment 1: This embodiment provides a method for modifying the compression properties of PBO fibers, which is specifically completed in the following steps:

[0014] 1. Under the protection of protective gas, use γ-rays to irradiate PBO fibers, wherein the irradiation dose is 36KGy-50KGy, and the irradiation dose rate is 5.9KGy / h-6.0KGy / h;

[0015] 2. Transfer the PBO fiber treated in step 1 into the solution of epichlorohydrin, soak for 2h-10h, and the modification of the compressive properties of the PBO fiber is completed.

[0016] The KGy mentioned in this embodiment is kilogray, which means the total amount of ionizing radiation absorbed by a substance.

[0017] The KGy / h mentioned in this embodiment is kilogray / h, which means the total amount of ionizing radiation absorbed by the material per hour.

[0018] The gamma ray is used to irradiate the PBO fiber in step one described in this embodiment. Since the gamma ray is a kind of high-energy ray, in the interio...

specific Embodiment approach 2

[0024] Embodiment 2: The difference between this embodiment and Embodiment 1 is that the protective gas in Step 1 is nitrogen or a rare gas. Others are the same as in the first embodiment.

specific Embodiment approach 3

[0025] Specific embodiment three: the difference between this embodiment and specific embodiment one or two is that: the γ-ray in the step one is 60 Co gamma rays. Others are the same as in the first or second embodiment.

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Abstract

The invention relates to a method for modifying compression performance of PBO (poly (p-phenylene-2, 6-benzobisoxazole)) fiber, relates to the field of PBO fiber modifying methods, and mainly overcomes the defects that the unique microfiber structure of the PBO fiber prepared by the existing method is formed by binding secondary chemical bonds based on van der Waals force, so that when bearing axial compressive stress, the PBO fiber easily buckles and deforms to cause peeling and breakage of microfiber and is poor in compression performance. The method includes: firstly, pre-irradiating the PBO fiber by gamma ray to crosslink the internal microfiber of a fiber body; and secondly, soaking the pre-irradiated PBO fiber in epichlorohydrin solution for surface grafting. The method is applicable to the field of advanced-structure composite materials.

Description

technical field [0001] The present invention relates to the field of PBO fiber modification methods. Background technique [0002] PBO (poly-p-phenylenebenzobisoxazole) fiber is a high-performance fiber made of PBO polymer through liquid crystal spinning technology. It has many unique advantages, such as high specific strength, high specific modulus, and impact resistance. , Good heat resistance, etc. Its tensile strength and modulus are about twice that of Armoc (aramid) fibers. PBO fiber contains steel straight molecular chain, which makes it have excellent heat resistance, which is 100°C higher than Armoc fiber, and is currently an organic fiber with the best comprehensive performance. Therefore, PBO fiber has become an ideal reinforcement material in the field of aerospace and civil advanced structural composite materials. However, due to the unique microfibril structure of PBO fibers, the microfibrils are connected by secondary chemical bonds dominated by van der Waa...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D06M10/08
Inventor 张春华刘雅薇傅鑫张文生黄玉东
Owner HARBIN INST OF TECH
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