Investigation of the mechanical properties of the modified poly(p-phenylene benzobisoxazole) fibers based on 2-(4-aminophenyl)-1H-benzimidazol-5-amine

Abstract

A simple and efficient route preparing the carbon nanotube/2-(4-aminophenyl)-1H-benzimidazol-5-amine/poly(p-phenylene benzobisoxazole) (CNT-APBIA-PBO) copolymer was introduced in this article. The processability and mechanical properties were improved significantly after the incorporation of APBIA. First, the APBIA was prepared by ring-closure condensation and hydrogenation reduction from 4-nitrobenzaldehyde and 4-nitro-1,2-phenylenediamine. Then, the CNT-APBIA-PBO copolymer was prepared via copolymerization. After that, continuous CNT-APBIA-PBO copolymer fibers were fabricated using a dry-jet wet-spinning technique. The prepared CNT-APBIA-PBO copolymer fiber was characterized by Fourier transform infrared, wide-angle X-ray diffraction, and 13 C nuclear magnetic resonance spectroscopy, and its microstructure was analyzed by atomic force microscope and scanning electron microscope, respectively. The results show that CNT-APBIA-PBO copolymer fibers have a super thermal resistance similar to PBO, a tensile modulus about 34.9% higher than that of PBO fibers within a 30.4% enhancement of the tensile strength.

High-Performance Fibres – A Review of Properties and IR-Spectra

“…The weak signal at 3,092 cm −1 can be attributed to C-H stretching vibrations from H-atoms bonded to an aromatic ring system. The signal at 1,620 cm −1 can be attributed to the C=N stretching vibration, which is part of the heteroaromatic system, while the signal at 1,053 cm −1 can be attributed to the C-O stretching vibration of the -C-O-C-unit, which is also part of the heteroaromatic system [87]. The three signals at 1,412 cm −1 , 1,495 cm −1 and 1,568 cm −1 can be attributed to C=C vibrations from the aromatic ring systems.…”

Hydrothermal aging behavior of high‐performance polymeric fibers: Mechanical performance at the yarn scale and chemical analysis

“…In addition, the peak at 1050 cm À1 can be assigned to the vibration of the C O and C O C units. 46,47 The three peaks found at 1555, 1496, and 1412 cm À1 are attributed to the C=C vibration in the heterocyclic aromatic structure of the PBO polymer. Besides, the strong peak around 701 cm À1 has been attributed to the oxazole ring in PBO.…”

Thermal aging of high‐performance fabrics used in the outer shell of firefighters' protective clothing

“…The peak at 1050 cm À1 was indicative of the vibration of C O and C O C bonds. 58,59 In addition, the strong peak at 701 cm À1 was attributed to the oxazole ring in PBO's chemical structure.…”