Abstract
To enhance the interfacial adhesion between poly(p-phenylene terephthalamide) (PPTA) fibers and a rubber matrix without damaging the fiber structures, aminated carbon nanotubes (NH2-CNTs) were mildly deposited onto the fiber surface by combining the biomimetic modification of dopamine via the Michael addition reaction. Furthermore, differences between the “one-step” method and the “two-step” method were researched through adjusting the addition sequence of NH2-CNTs. The surface morphologies and chemical structures of PPTA fibers before and after modification were characterized by scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FTIR) and X-ray photoelectron spectroscopy (XPS). The mechanical properties of fibers and the adhesive properties with rubber were tested using an electronic tensile tester of single-filament and universal testing machine, respectively. After modification by the “one-step” method for 24 h, the single-filament tensile strength of the modified fibers increased by 16.5%, meanwhile, the pull-out force of the modified fibers to rubber increased by approximately 59.7%. Compared with the “two-step” method, the “one-step” method had superiority due to the short reaction time and the large deposition rate of CNTs.
Highlights
As a new type of high-performance material, poly(p-phenylene terephthalamide) (PPTA) fibers integrated with high specific strength, outstanding modulus, excellent corrosion resistance and heat resistance are widely used in rubber products to reinforce composites [1,2]
The deposition of NH2-Carbon nanotubes (CNTs) can enhance the roughness of the fiber surface as well as form interlaced network structures to generate mechanical interlocking with rubber matrix [48]
NH2-CNTs were successfully deposited onto the surface of PPTA fibers by combining the biomimetic modification of dopamine with the Michael addition reaction, which effectively improved the interfacial adhesion between PPTA fibers and rubber the matrix
Summary
As a new type of high-performance material, poly(p-phenylene terephthalamide) (PPTA) fibers integrated with high specific strength, outstanding modulus, excellent corrosion resistance and heat resistance are widely used in rubber products to reinforce composites [1,2]. The research hotspot now is enhancing the interfacial adhesion between PPTA fibers and rubber matrix via an effective surface modification method. There some modification methods have been investigated to improve interfacial adhesion of high-performance fibers with a matrix, including ultrasonic [5], high-energy radiation [6,7,8], plasma treatment [9,10], acid etching [11,12], biological enzymes [13,14] and grafting [15,16]. Chen and co-workers [19] first introduced amino
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
