Ultrastructure of poly(p-phenylenebenzobisoxazole) fibers

Martin, David C.; Thomas, Edwin L.

doi:10.1021/ma00009a049

Cited by 102 publications

(86 citation statements)

References 11 publications

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“…According to detailed crystal structure analysis performed by Tashiro et al, the proposed structure for PBO is a monoclinic cell with a = 11.2 Å, b = 3.57 Å, C =12.01 Å, and γ = 100.6 o , corresponding to 2 polymer repeat units per cell [28]. The PBO chain in the crystal structure has been observed to have an almost perfectly planar conformation.…”

Section: X-ray Diffractionmentioning

confidence: 99%

Chemical and physical characterization of poly(p-phenylene-2, 6-benzobisoxazole) fibers used in body armor

Chin¹,

Byrd²,

Forster³

et al. 2006

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Problems with the performance and durability of body armor based on poly(p-phenylene-2,6-benzobisoxazole) (PBO) fiber became apparent in the summer of 2003, when PBO-based body armor that had been manufactured less than 8 months earlier was penetrated by a bullet. Mechanical testing of the yarns taken from the penetrated vest indicated a 30 % decrease in tensile strength relative to yarns taken from new, unworn PBO-based vests of the same model. A number of analytical metrologies were used to characterize the yarns, including chemical (elemental and molecular) analysis, mechanical testing, thermal analysis and microscopy. Attenuated total reflectance (ATR) infrared analyses of the yarns revealed differences in their degree of hydrolytic degradation as determined by the presence of benzamide structures. The rank order of reduction in benzamide, which corresponds to benzamide hydrolysis, correlates with the rank order reduction in tensile strengths for these same yarns.

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Section: X-ray Diffractionmentioning

confidence: 99%

Chemical and physical characterization of poly(p-phenylene-2, 6-benzobisoxazole) fibers used in body armor

Chin¹,

Byrd²,

Forster³

et al. 2006

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“…The apparent density of the prepared PBO nanofiber mat was 1.10 ± 0.07 g/cm 3 . The porosity calculated using a PBO fiber density of 1.54 g/cm 3 [13] was found to be 28.7 ± 4.2%. In addition, the PBO nanofiber mat was determined to have a high specific surface area of 42.6 g/m 2 , and numerous meso pores were observed in its structure.…”

Section: Resultsmentioning

confidence: 96%

Preparation and Properties of Rigid PBO Polymer Nanofibers Prepared via Crystallization From a Dilute Solution in Sulfuric Acid

Uchida

Furukawa

2014

J. Photopol. Sci. Technol.

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Poly(p-phenylene benzobisoxazole) (PBO) has excellent thermal stability and mechanical properties because of its rod-like rigid structure. Preparing nanofibers of PBO using ordinary methods is difficult (e.g., electrospinning) because PBO is not soluble in organic solvents. Herein, we report the preparation of PBO nanofibers with an average diameter of approximately 50 nm via crystallization from a dilute solution in sulfuric acid. In addition, a PBO nanofiber mat was prepared that exhibited extremely high thermal stability and high thermal diffusivity, etc.

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“…The apparent density of the obtained PBO network was 0.82 g/cm 3 . Its porosity was 46%, calculated on the basis of the density of PBO fiber of 1.54 g/cm 3 [5]. The surface and fracture surface of the PBO network were observed by scanning electron microscopy (SEM), as shown in Fig.…”

Section: Preparation Of Pbo Network Filmmentioning

confidence: 99%

Development of a Novel Preparation Method for Highly Porous Heat-Resistant Rigid Polymer Network Films and Evaluation of their Properties

Uchida

Ikeda

Suzuki

et al. 2015

J. Photopol. Sci. Technol.

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A rigid polymer network of poly(p-phenylene benzobisoxazole) (PBO) has excellent mechanical properties and thermal stability. Many nano voids exist within the network. However, a PBO network cannot be formed into films or fibers. Generally, PBO networks are prepared by one-step polycondensation in polyphosphoric acid. In this study, we have prepared a PBO network by a two-step method involving po lyme r iza tion of a PBO network precursor (pre-PBO network) in N-methyl-2-pyrrolidone followed by thermal c yc liza tion . Heat-resistant porous PBO network films have been successfully obtained by this two-step method. The properties of the PBO network films have been evaluated.

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Ultrastructure of poly(p-phenylenebenzobisoxazole) fibers

Cited by 102 publications

References 11 publications

Chemical and physical characterization of poly(p-phenylene-2, 6-benzobisoxazole) fibers used in body armor

Chemical and physical characterization of poly(p-phenylene-2, 6-benzobisoxazole) fibers used in body armor

Preparation and Properties of Rigid PBO Polymer Nanofibers Prepared via Crystallization From a Dilute Solution in Sulfuric Acid

Development of a Novel Preparation Method for Highly Porous Heat-Resistant Rigid Polymer Network Films and Evaluation of their Properties

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