Method for preparing poly(p-phenylene) benzo dioxazole composite fiber containing carbon nano tube

Abstract

The invention relates to a preparation method of PBO composite fibers containing carbon nano tubes, which comprises the steps of carrying out acid oxidation treatment to the carbon nano tubes, preparing PBO prepolymer solution, adding a carbon nano tube solution after the acid oxidation treatment, a TPA suspension and the PBO prepolymer solution into a double screw extruder for carrying out high-efficient blending reaction so as to be extruded, preparing the PBO composite fibers containing the carbon nano tubes by dry-jet wet spinning and the like. Compared with the PBO composite fibers synthesized under the same conditions, the PBO composite fibers prepared by the method of the invention have the tensile strength improved by 10 to 90 percent and the modulus improved by 10 to 50 percent. The PBO composite fibers containing carbon nano tubes and prepared by the method can be taken as a reinforcing agent of thermosetting resin, rubber, plastics and the like, and can be applied in protective clothing, flame resistant materials, or friction material and the like.

Description

technical field [0001] The invention relates to a preparation method of poly-p-phenylene benzobisoxazole composite fiber containing carbon nanotubes. Background technique [0002] Poly-p-phenylene benzobisoxazole (PBO) fiber is a new type of lyotropic liquid crystal aromatic heterocyclic polymer fiber. Its structure is shown in formula 1. It is made by silk technology, so it has high mechanical properties, and its thermal stability is closer to the theoretical limit of organic polymer crystals. Therefore, it has become a new type of high-performance fiber material and is called the super high-performance fiber of the 21st century. [0003] [0004] The chemical structural formula of formula 1 poly-p-phenylene benzobisoxazole (PBO) [0005] Carbon nanotubes (CNTs) are quasi-one-dimensional materials with special structures, which have excellent mechanical and electrical properties and good thermal stability. , and compound or hybridize it with polymer materials to obtai...

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Problems solved by technology

For the in-situ polymerization method, since CNTs participate in the polymerization reaction, there is a chemical bond between the CNTs and the polymer, which can greatly improve the interfacial interaction between the CNTs and the polymer, thereby facilitating the transfer of stress between the polymer and the CNTs, and more Good effects such as the enhancement of CNTs are achieved, but this method also has some disadvantages, such as the addition of CNTs will prevent the growth of the molecular weight of the polymer itself, especially for stepwise polymerization, as described in the patent CN 1226326C; and the physical blending method It is usually relatively simple and convenient, especially suitable for large-scale production in industry, but whether the CNTs in the prepared composite material can be well dispersed in the polymer matrix, and the low interfacial bonding force with the polymer, so it is of great concern Polymer reinforcement is very limited

[0007] There is no report on the method of preparing poly-p-phenylene benzobisoxazole composite fibers containing carbon nanotubes in the prior art

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