Study On Nanoparticle Modified PBO Fiber And Its Propertie

In this paper,three different forms of UV-resistant and functional protective coatings on the surface of PBO fibers were prepared by chemical grafting method,self-assembly technology and physical coating method using nano-particle UV shielding agent.Test,analysis and characterization were carried out to study the UV resistance of three different composite materials and the functionality of PBO fiber endowed by nanoparticles.The surface of the PBO fiber is extremely smooth and doesn’t have any functional groups,so we used a combination of methanesulfonic acid and hydrogen peroxide to treat the fiber surface,the treatment temperature was 60℃,and the treatment time was 6h.Then,the functional groups obtained on the surface of the PBO fiber were acidified to perform the next steps of grafting,and the polysiloxane was successfully grafted on the surface of the PBO fiber,and a porous nano-coating was formed.The accelerated UV aging test showed that the mechanical properties of UV aging of PBO fiber showed an "L" shape,and after 300 hours of UV irradiation,its mechanical properties dropped sharply,and its breaking strength was only 16.84cN.The prepared modified PBO fiber was covered with a porous polysiloxane coating with an average pore diameter of 3.364nm during the ultraviolet aging experiment.It’s irradiated for 300 hours under the same conditions.Compared with the unmodified fiber,the mechanical properties were around 25.65cN,and the retention rate was 45.4%,which was 72.6%higher than that of the original PBO fiber.The binding capacity of the modified PBO fiber and epoxy resin was improved compared with the original fiber:the interface shear strength of the original fiber was 21.28MPa,and the interfacial shear strength of modified PBO fiber and epoxy resin was 45.72MPa,which was an increase of 114.8%.At the same time,the porous polysiloxane coating gave the PBO fiber good super-hydrophobic properties.The static contact angle with water was about 152°,showed self-cleaning ability.The initial oil-water separation efficiency in the oil-water separation test was 94.3%and after 10 cycles of use,its separation efficiency slightly decreased,but it still reached 91.1%.After the activation and sensitization process,adopting self-assembly technology,using solvothermal method,under the action of precious metal Pd,the flower-like copper sulfide was assembled on the surface of PBO fiber.The assembly mechanism of flower-like CuS on the surface of PBO fiber was explored.That was,with the help of Pd,CuS first formed anchor points on the surface of PBO fiber,and then continued to grow into flower-like CuS by relying on these anchor points.The ultraviolet absorption spectrum showed that the absorption intensity of PBO/CuS fiber in the ultraviolet band was greatly reduced compared with PBO fiber,and after 300h ultraviolet irradiation,the degree of ultraviolet light absorption had increased,and the mechanical properties of PBO/CuS fiber remain the amount was 32.56cN,which was 1.9 times the retention of PBO fiber.At the same time,the flower-like CuS coating gave the PBO fiber good photocatalytic performance.Under the synergy of hydrogen peroxide,and 60min UV lamp irradiation,the decomposition efficiency of methylene blue was as high as 97%,and its catalytic efficiency was maintained when it’s used for 7 times at 91%.At the same time,in the interface shear strength test,it’s found that the binding ability of PBO/CuS fiber and epoxy resin was also improved compared with the original fiber,which was increased by nearly 41.4%.Combined with organopolysiloxane(PDMS)and nano-flower-like CuS particles,a simple and easy physical coating method was used to prepare PBO faber with PDMS/CuS coating.After the faber was treated,its UV-Vis spectrum showed that the UV resistance of PBO/PDMS/CuS fabrics had not only been improved very well,but after 300 hours of UV irradiation,the stability of UV resistance was more nice,there’s little change in its absorption capacity in the ultraviolet range.At the same time,the PBO/PDMS/CuS faber had a more efficient photocatalytic degradation ability.Under the cooperation of hydrogen peroxide,the degradation rate of methylene blue at a specified concentration could reach 97%in 160 minutes of UV lamp irradiation,and after 18 cycles of use,although the photocatalytic efficiency of PBO/PDMS/CuS fiber had been reduced,its photocatalytic efficiency still remained above 95%.