Ultrasonic chemistry surface modifying method for PBO fiber

Abstract

The invention relates to the technical field of macromolecule fiber surface modification and in particular provides a method for modifying the ultrasonic chemical surface of PBO fiber. The method of the invention is characterized in that the method comprises: dipping the PBO fiber into chemical solution which is well arranged and evenly dispersed, vibrating for 1-10min with ultrasonic wave under the condition that the ultrasonic power is 30-100W, the ultrasonic frequency is 20-60 kHz, and the water bath temperature is 20-60DEG C, taking out the PBO fiber after modification, using deionized water or distilled water to wash repeatedly, taking out the PBO fiber which is modified after washing, and drying in 50-150DEG C, wherein chemical solution is at least one of mixed solution of polyphosphoric acid and anhydrous alcohol, polyphosphoric acid, methanesulfonic acid, nitric acid, formic acid and silane coupling agent. The investment cost for equipment which is used in the invention is low, the operation is convenient, the technical process is short, the modifying process is stable, the modified effect of the PBO fiber surface is increased, the fiber property loss is small, and the quality is reliable.

Description

technical field [0001] The invention belongs to the technical field of surface modification of polymer fibers, and in particular provides a method for ultrasonic chemical surface modification of PBO (poly-p-phenylene benzobisoxazole) fibers. Background technique [0002] Poly-p-phenylenebenzobisoxazole (PBO) fiber is an ultra-high-performance polymer fiber developed by Wolfe et al. in the early 1980s. It generally has a diameter of about 12 μm and has higher specific strength and specific modulus than aramid fibers. A series of excellent properties such as weight and high temperature resistance, its density is about 1.57g / cm 3 , the tensile strength reaches 5.8GPa, the tensile modulus reaches 280GPa, and the heat-resistant temperature reaches 650°C. As a reinforcement of a new generation of advanced composite materials, PBO fibers have broad application prospects in various fields of national economy, aerospace and national defense [Jin Junhong, Luo Kaiqing, Jiang Jianming,...

AI Technical Summary

Problems solved by technology

[0005] The object of the present invention is to provide a method for sonochemical surface modification of PBO fibers, which utilizes the cavitation effect of ultrasonic waves, is easy to implement under laboratory conditions and industrial production conditions, and has the simplest operation and the lowest production cost. In order to solve the problems of difficult control of the degree of modification, poor modification uniformity, serious damage to fiber properties, long modification time and high production cost when modifying the surface of PBO fiber by traditional chemical methods. , to overcome the defects of poor interfacial bonding performance between PBO fiber and metal, inorganic powder or resin due to its smooth surface and low activity, and improve the interfacial performance of PBO fiber and other materials