Improved interfacial adhesion via chemical coupling of cis-polybenzobisoxazole fibre-polymer systems

Yalvaç, Selim; Jakubowski, James J.; So, Ying‐Hung; Sen, Ashish

doi:10.1016/0032-3861(96)00333-3

Cited by 27 publications

(14 citation statements)

References 4 publications

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“…Polymerizations were carried out at a polymer concentration of 13 wt% and a P 2 O 5 concentration of 84 wt%. The obtained DHPBO/PPA dope was directly spun into fibers through a 18‐holes spinneret (hole size: 0.30 mm) via dry‐jet wet‐spinning at 185°C 8–9. The coagulation bath containing 10% PPA water solutions was maintained at room temperature.…”

Section: Methodsmentioning

confidence: 99%

UV accelerated aging and aging resistance of dihydroxy poly(p‐phenylene benzobisoxazole) fibers

Zhang

Yang

et al. 2011

Polymers for Advanced Techs

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By introducing binary hydroxyl groups into poly(p‐phenylene benzoxazole) (PBO) macromolecular chains, we synthesized dihydroxy poly(p‐phenylene benzobisoxazole) (DHPBO) polymers and then prepared DHPBO fibers by dry‐jet wet‐spinning. Comparative studies were performed between intrinsic PBO fibers and DHPBO fibers. The effects of hydroxyl polar groups on improving the UV aging resistance of PBO fibers were investigated. With the introduction of hydroxyl groups, substantial changes in the chemical structures and surface morphologies of DHPBO fibers were observed. As proved by tensile testing and intrinsic viscosity measurement, the UV resistance of DHPBO fibers is obviously improved compared to that of intrinsic PBO fibers. XRD results indicate that the UV aging of these fibers occurs mainly on the surfaces of fibers. Based on these results, the mechanism of UV aging of PBO fibers was discussed. Copyright © 2009 John Wiley & Sons, Ltd.

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Section: Methodsmentioning

confidence: 99%

UV accelerated aging and aging resistance of dihydroxy poly(p‐phenylene benzobisoxazole) fibers

Zhang

Yang

et al. 2011

Polymers for Advanced Techs

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“…Although some of the rigid-rod polymer fibers have relatively low compressive strength, their composites do not suffer catastrophic failure at high bending as do graphite and glass composites. Several methods, including fiber surface treatment with oxygen plasma, synthesis of copolymers with functional groups in the backbone and mixing functional additives into PBO fibers, are used to improve the interfacial adhesion between the PBO fiber and resin matrices (488). It has been observed that a 75% increase in interfacial shear strength is achieved with the additive methods (488).…”

Section: End Usesmentioning

confidence: 99%

“…Several methods, including fiber surface treatment with oxygen plasma, synthesis of copolymers with functional groups in the backbone and mixing functional additives into PBO fibers, are used to improve the interfacial adhesion between the PBO fiber and resin matrices (488). It has been observed that a 75% increase in interfacial shear strength is achieved with the additive methods (488). The rigid-rod polymer fiber is one of the best precursor materials for manufacturing ballistic products.…”

Section: End Usesmentioning

confidence: 99%

Rigid‐Rod Polymers

Wang¹,

Jiang²,

Adams³

2011

Encyclopedia of Polymer Science and Technology

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Pursuing high strength and high modulus polymer fibers and novel electrooptical properties have motivated much research activity in rigid‐rod polymers in the past 40 years. In this review, we examine the synthesis, structures, and properties of rigid‐rod polymers with emphasis on polybenzobisoxazoles (PBO), polybenzobisthiazoles (PBZT) and polybenzimidazoles (PBI), beginning with their solution properties, especially lyotropic liquid crystallinity. High performance fibers spun from lyotropic liquid crystalline polyphosphoric acid (PPA) solution are described. The characterization of fiber properties including mechanical, thermal, electrical, and optical properties is summarized. PBO (Zylon) and PIPD (M5) fibers were successfully commercialized in high strength applications such as body armor, ropes, cables, and recreational equipment in the last 10 years, and we discuss the possible causes of rapid degradation of some PBO fibers. The concepts of molecular composites and nanocomposites provide new applications in antiballistic materials, fire protection, athletic equipment, cables, strings, ropes, cordage, sails, multilayer circuits, and catalyst supports. Recently, rigid‐rod polymer films have drawn attention in the electrooptical fields, especially for phosphoric acid (PA)‐doped PBI membranes (Celtec MEAs) in the applications of high temperature fuel cells. Computer simulation has been employed as a powerful tool to predict the properties of the rigid‐rod polymers.

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“…Fibers prepared from this rodlike polymer belong to the new class of structural materials having low density, superior tensile strength and modulus [1,2]. Due to the exceptionally high specific strength and modulus, excellent thermal and oxidative stability, chemical resistance, cut and abrasion resistance, flame retardance, and long-term retention of these properties at elevated temperatures, PBO fibers provide great potential applications as reinforcements for high-performance composites in aeronautical and astronautical applications, protective garments, personnel ballistic armors and many military applications [3][4][5][6][7][8][9][10][11][12][13]. However, the employing PBO fibers as reinforcements have been limited by poor fiber-matrix interfacial adhesion because of the relatively smooth and chemically inactive fiber surfaces which prevent efficient physical and chemical bonding in the interface [14,15].…”

Section: Introductionmentioning

confidence: 99%

Surface analysis of oxygen plasma treated poly(p-phenylene benzobisoxazole) fibers

Zhang

Chen

Sun

et al. 2008

Applied Surface Science

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Improved interfacial adhesion via chemical coupling of cis-polybenzobisoxazole fibre-polymer systems

Cited by 27 publications

References 4 publications

UV accelerated aging and aging resistance of dihydroxy poly(p‐phenylene benzobisoxazole) fibers

UV accelerated aging and aging resistance of dihydroxy poly(p‐phenylene benzobisoxazole) fibers

Rigid‐Rod Polymers

Surface analysis of oxygen plasma treated poly(p-phenylene benzobisoxazole) fibers

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