High‐performance crystallized composite carbon nanoparticles/polyimide fibers

Abstract

High‐performance fibers have been obtained on the basis of fusible semicrystalline R‐BAPB polyimide (PI) matrix and single‐wall carbon nanotubes by the melt spinning method. The resulting fibers have been subjected to orientational drawing and crystallization annealing. An effect of introducing the single‐wall carbon nanotubes as well as orientation drawing and crystallization annealing on the crystallizability, structure, and mechanical properties of the composite PI fibers has been investigated. The use of the carbon nanotubes induces heterogeneous nucleation of the crystalline phase of PI on the surface of the nanoparticles. The introduction of the carbon nanoparticles increases the crystallization rate and reduces the shrinkage of the oriented fibers during annealing, making it possible to obtain crystallized PI fibers with enhanced mechanical characteristics.

Thermal, Mechanical, and Electrical Stability of Cu Films in an Integration Process with Photosensitive Polyimide (PSPI) Films

“…Other annealed PSPI (3 and 5 µm) samples showed reductions in the thickness compared to the as-deposited sample. A change in the dimensions due to the shrinkage of the PSPI can be observed with different annealing conditions [35,36]. However, the annealing at 350 • C with a temperature ramp rate of 2.5 • C/min under a N 2 ambient displays a similar behavior for both the 3 and 5 µm PSPI samples.…”

Comparison of properties of carbon reinforced plastic obtained on the basis of semicrystalline polyimideR‐BAPBand other high‐temperature‐resistant thermoplastic matrices

“…The synthesized partially crystalline polyimide had an average molecular weight M n ≈ 48,000, calculated according to the Mark Kuhn‐Hauwink equation from the intrinsic viscosity of the synthesized polyamic acid 39 . Earlier in Reference 22 the structure of the polyimide was proven by IR spectroscopy. Amorphous polyetherimide Ultem 1000 (PEI) (Guangdong, China) in the form of a powder with an average particle size of ≈40 μm; glass transition temperature T g ≈ 217°С, density 1.27 g/cm 3 . Semicrystalline polyetheretherketone (PEEK) brand Vicote 705 (Victrex USA Inc.) have an average particle size of ≈50 μm, glass transition temperature T g ≈ 143°С, melting point T m ≈ 343°С.…”

“…This PI is based on the dianhydride R (1,3‐bis‐(3,3′,4,4′‐dicarboxyphenoxy)benzene) and the diamine BAPB (4,4′‐bis(4″‐aminophenoxy)biphenyl). The peculiarity of this thermoplastic polyimide R‐BAPB is the ability to controlled crystallization and recrystallization, which has been repeatedly shown 22,23 in the example of fibers and matrices for composite materials. The operating temperature of CFRP with the R‐BAPB matrix in the crystallized state can reach 300°C.…”

“…15 This PI is based on the dianhydride R (1,3-bis-(3,3 0 ,4,4 0 -dicarboxyphenoxy)benzene) and the diamine BAPB (4,4 0 -bis(4 00 -aminophenoxy)biphenyl). The peculiarity of this thermoplastic polyimide R-BAPB is the ability to controlled crystallization and recrystallization, which has been repeatedly shown 22,23 in the example of fibers and matrices for composite materials. The operating temperature of CFRP with the R-BAPB matrix in the crystallized state can reach 300 C. In addition to PI, polyetheretherketone (PEEK), polysulfone, polyphenylene sulfide, polyphenylene oxide are currently considered as promising thermoplastics for the production of heat-resistant carbon plastics.…”

Influence of Molecular Weight on Thermal and Mechanical Properties of Carbon-Fiber-Reinforced Plastics Based on Thermoplastic Partially Crystalline Polyimide

“…One of the brightest representatives of highly heat-resistant thermoplastic binders capable of recrystallization from a melt is polyimide R-BAPB based on the dianhydride R (1,3-bis(3,3 ,4,4 -dicarboxyphenoxy)benzene) and the diamine BAPB (4,4 -bis(4 -aminophenoxy)biphenyl) [14]. Polyimide R-BAPB has a high glass transition temperature of about 200 • C and a viscosity of about 1000 Pa*s at 360 • C. A feature of this thermoplastic is the ability to control crystallization and recrystallization, which has been repeatedly demonstrated [15,16] in the example of fibers and binders for composite materials. The operating temperature of CFRPs with R-BAPB matrix in the crystallized state can reach 300 • C.…”