Compressive strength of coated rigid-rod polymer fibres

Santhosh, U.; Newman, Ken; Lee, C. Y. C.

doi:10.1007/bf00351628

Cited by 4 publications

(3 citation statements)

References 8 publications

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“…Contrary to nonlinear behavior in tension, with increasing axial compressive stress the compressive modulus decreases, the socalled "modulus softening (or strain softening)" phenomenon. For PBZT fibers, the decrease of compressive modulus could be up to 20% in the bending beam test determined with Raman spectroscopy (213) and up to 8% in the microtensile testing machine (MTM) test (214)(215)(216). It has been observed that under compression, the fiber birefringence decreases, corresponding to a crystal/fibril disorientation away from the fiber axis (191,(208)(209)(210)(211)(212)217,218).…”

Section: Compressive Properties As Listed Inmentioning

confidence: 99%

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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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Section: Compressive Properties As Listed Inmentioning

confidence: 99%

“…(8) PBO composites with imbedded thermoset matrix(18,271,288). (9) PBO fibers coated with stiff ceramic, metal, or metal compounds(2,32,102,133,207,213,289). (10) Preparation of PBO/single-wall-carbon-nanotube composite fibers(290).…”

mentioning

confidence: 99%

Rigid‐Rod Polymers

Wang¹,

Jiang²,

Adams³

2011

Encyclopedia of Polymer Science and Technology

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“…The filament used in this work is a composite of ceramic/metal particles in a polymer matrix. In the literature, buckling of polymers is usually treated using Euler's criterion with the elastic modulus (in the case of elastic buckling) or tangent modulus in case of inelastic buckling (nonlinear region of the stress strain curve) (Odom and Adams, 1994;Timoshenko and Gere, 1961;de Teresa et al, 1985;Rein and Cohen, 1995;Lee and Santhosh, 1993;Santhosh et al, 1995;Swanson, 1992;Lankford, 1995). The magnitude of the calculated buckling stress will vary with the use of tangent or elastic modulus, but a material with a higher elastic modulus than another material can be expected to have a higher tangent modulus as well.…”

Section: Mechanical Propertiesmentioning

confidence: 99%

Feedstock material property – process relationships in fused deposition of ceramics (FDC)

Venkataraman

Rangarajan

Matthewson

et al. 2000

Rapid Prototyping Journal

156

119

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Fused deposition of ceramics (FDC) is a solid freeform fabrication technique based on extrusion of highly loaded polymer systems. The process utilizes particle loaded thermoplastic binder feedstock in the form of a filament. The filament acts as both the piston driving the extrusion and also the feedstock being deposited. Filaments can fail during FDC via buckling, when the extrusion pressure needed is higher than the critical buckling load that the filament can support. Compressive elastic modulus determines the load carrying ability of the filament and the viscosity determines the resistance to extrusion (or extrusion pressure). A methodology for characterizing the compressive mechanical properties of FDC filament feedstocks has been developed. It was found that feedstock materials with a ratio (E/Z a ) greater than a critical value (3610 5 to 5610 5 s -1 ) do not buckle during FDC while those with a ratio less than this range buckle.

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Rigid‐Rod Polymers

Jiang¹,

Eby²,

Adams³

2002

Encyclopedia of Polymer Science and Technology

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The synthesis, structure, properties, and applications of rigid‐rod polymers are described. PBZT and PBZO are selected as the models to be discussed in detail with respect to their fiber, film, and molecular‐composite processing, liquid‐crystal solution behavior, and computer simulations. Emphasis is placed on their ultimate tensile, thermal, chemical, electrical, and optical properties, and how to improve their compressive properties. The current and future usages of rigid‐rod polymers in various scientific, technical, and engineering areas also have been introduced. Many new rigid‐rod polymer materials, such as PPP, PPE, PPV, PTh, and other organometallic polymer systems are included.

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Compressive strength of coated rigid-rod polymer fibres

Cited by 4 publications

References 8 publications

Rigid‐Rod Polymers

Rigid‐Rod Polymers

Feedstock material property – process relationships in fused deposition of ceramics (FDC)

Rigid‐Rod Polymers

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