We have fabricated unilayer electroluminescent devices from soluble poly(p-pyridine) (PPy). The solubility of PPy in weak acids allows direct spin casting of the polymer films. The electroluminescence (EL) spectrum peaks at 2.5 eV (497 nm) corresponding to white light weighted toward the blue end of the spectrum. The photoluminescence (PL) spectrum peaks at 2.35 eV (530 nm). The operating voltages of the devices ranged from 4 to 12 V with current densities of 6 to 8 mA/sq mm. We compare our...
Topics: DTIC Archive, Gebler, D. D., OHIO STATE UNIV COLUMBUS DEPT OF PHYSICS, *ELECTROLUMINESCENCE,...
Preliminary experiments were carried out to determine the feasibility of preparing filaments from each of the five polymers submitted. These preliminary experiments disclosed several unanticipated problems. Although polycaprolactone was easily melt spun into strong fibers, the fibers contained gel particles. The poly (glycolic acid) submitted was not satisfactory because of its low molecular weight. Because of these difficulties, the Institute investigated a commercially available...
Topics: DTIC Archive, Perkins,R B, SOUTHERN RESEARCH INST BIRMINGHAM ALA, *POLYMERS, *SPINNING(INDUSTRIAL...
This report summarizes various techniques for bonding and sealing Teflon(R) 100 FEP resin to itself and to other materials. Techniques included are: (1) bonding to flat surfaces, (2) encapsulation and sealing to metal shapes, and (3) special techniques such as spin welding, film wrapping, hot gas welding, and heat shrinking. Typical applications where a bond or seal is important are discussed. p1
Topics: DTIC Archive, Stecca, E. A., DU PONT DE NEMOURS (E I) AND CO WILMINGTON DE POLYCHEMICALS DEPT,...
Significant progress has been achieved on key research projects that were supported by this grant. The researchers have extended the asymptotic modelling of free surface jets, through an averaging approach, to all orders in perturbation. These higher order theories were then extended to pointwise approximations, which yield more detailed characteristics of the flow. Dynamical ill-posedness of these model equations was discussed. Fully time-dependent model simulations were developed. Practical...
Topics: DTIC Archive, Forest, M G, OHIO STATE UNIV COLUMBUS DEPT OF ENGINEERING MECHANICS, *COMPUTATIONS,...
The initial effort concentrated on using melt spinning as the rapid solidification method for binary, ternary, quaternary and complex alloys. Ribbons were produced and given heat treatments to determine the effect on the microstructure. The ductility of the ribbons was tested in both the as-melt spun and heat treated conditions by bend testing. Four alloys were chosen for scaleup. The scaleup rapid solidification method was atomization. However, sufficient quantities and quality of powder could...
Topics: DTIC Archive, Austin, C M, GE AIRCRAFT ENGINES CINCINNATI OH, *SOLIDIFICATION, *DUCTILITY,...
Spinning water atomization process (SWAP), one of the rapid solidification processes, promised to produce coarse noncombustible magnesium alloy powder 1 4 mm long and have fine alpha-Mg grains and Al2Ca intermetallic compounds. SWAP had economical and safe benefits in producing coarse Mg alloy powders with very fine microstructures in the mass production process due to its extreme high solidification rate compared to the conventional atomization process. AMX602 (Mg-6%Al-0.5%Mn-2%Ca) powders...
Topics: DTIC Archive, OSAKA UNIV IBARAKI (JAPAN), *MAGNESIUM ALLOYS, *MECHANICAL PROPERTIES,...
The properties of the multifilament yarn improved over those achieved in the past. Strand tensile strength of up to 2.30 GPa (approx. 350 Kpsi) was measured on fibers with an elastic modulus of 200 GPa (approx. 30 Mpsi). Tests on flat plate composites with epoxy indicated good translation of properties if corrections were made for insufficient fiber loading. The absolute tensile strength of the thin monofilament did not exceed the levels reported in the previous report, but reliable average...
Topics: DTIC Archive, Didchenko, R, UNION CARBIDE CORP CLEVELAND OH CARBON PRODUCTS DIV, *COMPOSITE...
We gained significant new insights into the role of hydration for silks with our data allowing us to model in considerable detail the interaction between silk molecules and water. Our fibre and feedstock experiments demonstrated that the hierachical morphology in the patterning and mesophase assembly is spatially optimised. Our multiscale model, based on experimental data collected iteratively and focussing on the control of energy storage (strength) and dissipation (toughness) at the molecular...
Topics: DTIC Archive, Vollrath, Fritz, OXFORD UNIV (UNITED KINGDOM), *SPINNING(INDUSTRIAL PROCESSES),...
The objective of the project is to develop high-strength, bioabsorbable materials useful in the treatment and management of maxillofacial injuries. The specific goal for the current contract year has been the attainment of high-strength, high-modulus, biodegradable ceramic fibers for use in the reinforcement of biodegradable polymeric fracture-fixation plates. To meet this goal, we have examined the spinnability and processibility of beta-tricalcium phosphate (whitlockite) and phosphate-free...
Topics: DTIC Archive, Lewis,D H, SOUTHERN RESEARCH INST BIRMINGHAM AL, *Ceramic fibers, *Surgical...
This report describes progress on developing Y-123 wire for an HTSC motor. The wire development involves synthesis of Y-123 powder, spinning polymer-containing 'green fiber', heat treating the fiber to produce metallized superconducting filaments, and characterizing the electrical properties. A melt spinning process was developed for producing 125-micron diameter green fiber containing 50 vol% Y-123. This fiber can be braided for producing transposed multifilamentary wire. A process was...
Topics: DTIC Archive, Holloran, John W, CERAMICS PROCESS SYSTEMS CORP MILFORD MA, *CERAMIC MATERIALS,...
Amorphous alloys of (Fe(1-x)Mn(x)) (73.5) Si(13.5)B(9) Nb(3)Cu(1), where chi = 0, 0.05, 0.10, 0.15, were prepared by vacuum melt-spinning. Anneals performed at or above the crystallization temperature led to the formation of a nanostructure where the primary phase is a body centered cubic or DO(3) FeSi phase embedded within an intergranular amorphous phase. The saturation induction of the chi = 0.05 alloy is 1.19 T, slightly lower than the parent alloy. Prolonged thermal aging led to an...
Topics: DTIC Archive, NAVAL RESEARCH LAB WASHINGTON DC, *MAGNETIC PROPERTIES, *THERMAL PROPERTIES,...
Cellulose acetate (CA) thin, porous membranes were produced by electrospinning precursor polymer solutions in acetone at room temperature. During this process, CA nanofibers were produced when a high electric field of 12 kV was applied to the precursor solution. The diameters of fibers obtained varied from 100 nm to 1.2 micron m while the average diameter was approximately 500 nm. The electrospinning parameters used to control the morphology of the fibers and their membranes are flow rate, the...
Topics: DTIC Archive, Han, Dong, Goldgraben, Sara, Frame, Mary D., Gouma, Pelagia-Irene, STATE UNIV OF NEW...
The cut-and-try method of determining sheet metal formability has long been the standard practice in the aircraft industry. This two-volume report presents methods of determining formability analytically for the twelve most common processes of forming sheet metal. This method is based on utilization of a material's mechanical properties to predict formality. The first volume on development gives the procedure used to arrive at the objective of predicting formability. First, basic limit...
Topics: DTIC Archive, Wood, W W, CHANCE VOUGHT CORP DALLAS TX, *SHEET METAL, *MATERIAL FORMING, MECHANICAL...
We have undertaken the study of cobalt-free alloys for evaluation of their use in permanent magnet fabrication. A two-phase study was carried out. In the first phase, the plasma arc process was employed for the production of fine powder of MnAlC and the second phase was confined mainly with melt spinning. Both of these rapid solidification technology approaches should permit stabilization of metastable phases and offer a unique technique of generating coercivity. The results of our...
Topics: DTIC Archive, Narasimhan,K S V L, COLT INDUSTRIES INC PITTSBURGH PA CRUCIBLE RESEARCH CENTER,...
It has been shown that rapid-solidified (RS) melt-spun fiber/ribbon/foil samples can have very high performance of the metallic actuator/sensor properties. However, as for the applications of these sample materials in smart material systems, the developed rapid-solidified samples are thought to be inevitably too small force to move the machines and structures in the engineering field. The authors propose one novel material processing technique that can produce the bulk type solid-state...
Topics: DTIC Archive, Furuya, Y, TOHOKU UNIV SENDAI (JAPAN), *SOLIDIFICATION, *BULK MATERIALS,...
Tbe purpose of this work was to determine how to obtain the maximum reinforcement from thermotropic liquid crystalline polymers (TLCPs) when blended with other thermoplastics to produce light weight, wholly thermoplastic composites. Towards this goal, the research first focused on the spinning of thermoplastic/TLCP composite strands and fibers using a novel dual extrusion technique developed in our laboratory. It was found that the high degree of extensional deformation achieved in spinning and...
Topics: DTIC Archive, Baird, Donald G., VIRGINIA POLYTECHNIC INST AND STATE UNIV BLACKSBURG DEPT OF...
A series of (Co1-xNix)88Zr7B4Cu1 soft magnetic alloys, where X was varied from 0 to 1, were fabricated by a melt spinning process into thin ribbons of the material. This process was followed by an isothermal anneal to produce a nanocomposite alloy, i.e. nanocrystalline grains in a residual amorphous matrix. The alloy series was designed to investigate crystallization kinetics and limits to the compositional regime where a nanocomposite could be formed. The primary and secondary crystallization...
Topics: DTIC Archive, ALABAMA UNIV TUSCALOOSA DEPT OF METALLURGICAL AND MATERIALS ENGINEERING,...
Under Task Assignment No. 6, efforts were directed to develop processing methods to make carbon fiber/thermoplastic fiber preforms that are easy to handle and drapeable, and to consolidate them into low void content laminates. The objectives were attained with the development of the hybrid yarn concept; whereby, thermoplastic fiber can be intimately intermixed with carbon fiber into a hybrid yarn. This has been demonstrated with the intermixing of Celion 3000 with a Celanese liquid crystal...
Topics: DTIC Archive, Ketterer, M. E., CELANESE RESEARCH CO SUMMIT NJ, *LAMINATES, *CARBON FIBERS,...
Electro-spinning is a process by which sub-micron polymer fibers can be produced with an electrostatically driven jet of polymer solution (or polymer melt). Electro-spun fibers are typically collected in the form of non-woven mats, which are of interest for a variety of applications, including semi-permeable membranes, filters, composite reinforcement, and scaffolding used in tissue engineering. A characteristic feature of the electro-spinning process is the onset of a chaotic oscillation of...
Topics: DTIC Archive, Deitzel, J M, ARMY RESEARCH LAB ABERDEEN PROVING GROUND MD WEAPONS AND MATERIALS...
This is the First Quarterly Report of a program to produce practical htsc wires, and build a htsc electric motor using this wire. The htsc ceramic wire will be a flexible composite of many fine ceramic filaments clad with copper or aluminum. The three basic elements of this method are: 1) spinning polymer-containing 'green' fibers; 2) sintering the fibers to make bare superconducting ceramic filaments; and 3) cladding the filaments with copper. Albany International Research Corporation...
Topics: DTIC Archive, Halloran, John W, CERAMICS PROCESS SYSTEMS CORP CAMBRIDGE MA, *ALUMINUM, *ELECTRIC...
Supercritical fluid (SCF) extraction has been investigated for the production of the mesophase pitch used to spin high-performance carbon fibers. A bench-scale, continuous-flow apparatus was designed and constructed for fractionating petroleum pitch with SCF solvents at temperatures and pressures to 400 degC and 350 bar respectively. A heat-soaked, isotropic petroleum pitch has been fractionated with supercritical toluene in a region of liquid-liquid equilibrium at temperatures and pressures...
Topics: DTIC Archive, Thies, Mark C, CLEMSON UNIV SC DEPT OF CHEMICAL ENGINEERING, *FLUIDS, *EXTRACTION,...
The third annual report of the University Research Initiative project at UCSB on High-Temperature, High-Performance Composites consists of sections compiled in a total of six books. The first section in Book 1 is concerned with the properties and structure of bimaterial interfaces and the related problem of coating decohesion and cracking. The second section describes research on the strengths and fracture resistance of brittle matrix composites manufactured with fibers, whiskers and ductile...
Topics: DTIC Archive, CALIFORNIA UNIV SANTA BARBARA DEPT OF MATERIALS, *COMPOSITE MATERIALS, CREEP...
Metastable transition metal alloys, primarily, metallic glasses, were prepared by rapid solidification processing (melt spinning and arc-furnace hammer-and-anvil quenching); appropriate properties of these alloys were investigated. Specifically, glassy alloys containing transition metals such as Ti, Zr, Nb, Ta, Ni, Rh and Ir, as well as metals such as U, Ca and Cu and non-metallic additives such as O were studied; many of these glasses were prepared in this program for the first time....
Topics: DTIC Archive, Giessen,B C, NORTHEASTERN UNIV BOSTON MA BARNETT INST OF CHEMICAL ANALYSIS AND...
This is the first progress report of a five month program to demonstrate the feasibility of manufacturing superconducting wires from YBa2Cu307-x, consisting of a small ceramic core with a copper cladding. The critical current will be enhanced by creating a 010 fiber texture in the ceramic using a combination of green particle orientation and controlled recrystallization. The ceramic core will be manufactured by solution dry- spinning of a mixture of the superconducting ceramic powder with...
Topics: DTIC Archive, Halloran, John W, CERAMICS PROCESS SYSTEMS CORP CAMBRIDGE MA, *CERAMIC MATERIALS,...
A powered back-up roll was designed and built for the purpose of providing auxiliary torque to a veneer bolt. Initial testing indicates that a substantial percentage of the required torque can be supplied by the powered back-up roll. This reduces the likelihood of spin-out occurring and allows a reduction in the final core size when used in conjunction with smaller chucks. (Author)
Topics: DTIC Archive, Fronczak,Frank J, FOREST PRODUCTS LAB MADISON WI, *DRIVES, *ROLLERS, *TORQUE, *BACKUP...
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Topics: Radio Program, Industrial processes
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Topics: Radio Program, Industrial processes
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The program objective was to construct and operate a rapid solidification rate (RSR) processing resource facility based on melt spinning of pilot scale quantities. It consists of a controlled-atmosphere melt spinner with a capacity of 1 lb of ferrous alloy, a 100 g capacity melt spinner (to establish experimental parameters and reduce cross-contamination), and a high-speed ribbon cutter for flake preparation. RSR processed materials were delivered to Government, industrial and academic users.
Topics: DTIC Archive, Giessen, B C, NORTHEASTERN UNIV BOSTON MA BARNETT INST OF CHEMICAL ANALYSIS AND...
Biodegradable polymeric nanofibers are of great interest as scaffolds for tissue engineering and drug delivery due to their extremely high surface area, high aspect ratio and similarity in structure to the extracellular matrix (ECM). Polyphosphazenes due to their synthetic flexibility, wide range of physico-chemical properties, non-toxic and neutral degradation products and excellent biocompatibility are suitable candidates for biomedical applications. The objective of the present study was to...
Topics: DTIC Archive, Bhattacharyya, Subhabrata, Nair, Lakshmi S., Singh, Anurima, Krogman, Nick R.,...
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This book places emphasis on phase formations and special features of eight principal alloy systems (including pure aluminum) of deformed aluminum alloys, the effects of various working methods (e.g. extrusion, rolling, forging, cold-drawing, etc.) on the alloy structures, and the peculiarities and regularities of alloy structures under various kinds of heat treatments (e.g. homogenization, annealing, quenching, ageing, etc.). Diagrams and accompanying explanations are generally included for...
Topics: DTIC Archive, FOREIGN TECHNOLOGY DIV WRIGHT-PATTERSON AFB OHIO, *FOREIGN TECHNOLOGY, *ALUMINUM...
A two-slurry vortex spinning process was developed for spinning a yarn of aligned high modulus core fibers wrapped with helically twisted fibers of the same or lower modulus. Yarn was formed at the entry to the rotating tube of the spinning assembly as the annular fiber suspension twisted around the more viscous core slurry. The rotating tube generated an axial vorticity gradient within the suspension, and the resulting hydrodynamic force twisted the outer fiber layer. Yarn was spun consisting...
Topics: DTIC Archive, Riley, Myrne R, MONSANTO RESEARCH CORP ST LOUIS MO, *COMPOSITE MATERIALS, *SPINNERS,...
The third annual report of the University Research Initiative project at UCSB on High-Temperature, High-Performance Composites consists of sections compiled in a total of six books. The first section in Book 1 is concerned with the properties and structure of bimaterial interfaces and the related problem of coating decohesion and cracking. The second section describes research on the strengths and fracture resistance of brittle matrix composites manufactured with fibers, whiskers and ductile...
Topics: DTIC Archive, Evans, A G, CALIFORNIA UNIV SANTA BARBARA DEPT OF MATERIALS, *COMPOSITE MATERIALS,...
The first section of the progress report is concerned with the development of rapidly solidified Al-8Fe-2Mo-SI alloys for elevated temperature applications. Rapidly solidified Al-8FE-2Mo alloys containing silicon in the range of 0 to 1wt pct were produced by melt spinning. In the second annual report, preliminary results of the effect of Si on the formation of the Sone A microstructure and on subsequent changes of this structure during heat-treatment were described. It was shown that addition...
Topics: DTIC Archive, Fraser,, ILLINOIS UNIV AT URBANA DEPT OF METALLURGY AND MINING ENGINEERING, *ALUMINUM...
The research activities are focused on modeling of polymeric liquid crystal (LCP) flows. We first summarizes our comprehensive studies on the shear and elongational flow with an imposed velocity field. This includes a complete characterization of the orientational equilibrium and their bifurcation behavior as well as the detailed study on the orientation dynamics with respect to both types of flows. In particular, biaxial patterns and their dynamics are treated carefully. We then report on the...
Topics: DTIC Archive, Wang, Qi, INDIANA UNIV FOUNDATION INDIANAPOLIS RESEARCH AND SPONSORED PROGRAMS,...
Arc melted buttons, melt spun ribbons and splat quenched foils of various (TiNb)3Al alloys (up to 30 at. % Nb) have been analyzed in their as-solidified conditions in order to determine the effect of cooling rate on the evolution of non-equilibrium microstructures. For Nb concentrations of 5% and above, the rapidly-quenched structures contained the ordered beta-phase (B2 structure) the volume fraction of which was found to increase significantly with both increasing Nb concentration and...
Topics: DTIC Archive, Kaufman, Michael J, WASHINGTON UNIV SEATTLE DEPT OF MATERIALS SCIENCE AND...
The development of morphology, when solutions of rigid polymers are transformed from the liquid to the solid state, was studied in two particular cases: coagulation of a monodomain nematic solution and gelation of a dilute isotropic solution. Direct observation of the morphology by electron microscopy (E.M.) was augmented by measurements of small-angle X-ray scattering (SAXS). A theoretical framework for the analysis of SAXS measurements from oriented systems using a slit-collimated incident...
Topics: DTIC Archive, Cohen, Yachin, MASSACHUSETTS UNIV AMHERST DEPT OF POLYMER SCIENCE AND ENGINEERING,...
The polymer chains of a novel asymmetric polydiacetylene, namely poly((8-butoxy carbony)methyl urethanyl) 1-(5-pyrimidyl)-octa-1,3-diyne)(BPOD), in the absence of nonlinear optically active chromophores and without recourse to poling assemble in an acentric stable polar organization upon spin coating or solution casting. Asymmetry of the side groups and the spontaneous alignment of the urethane side groups by means of hydrogen bonds appear to be responsible for this organization. An abrupt...
Topics: DTIC Archive, Kim, W H, MASSACHUSETTS UNIV LOWELL DEPT OF CHEMISTRY, *POLYMERS, *FILMS, *BULK...
Poly(3-alkylthiophenes) have been prepared using anhydrous FeCL3 while dry air was bubbled through the reaction mixture. Molecular weight studies via GPC, using polystyrene standards in conjunction with RI and UV detection along with absolute determinations using a multiangle laser light scattering (MALLS) detector, have shown these materials are of high molecular weight(Mw of up to 400,000) and relatively low polydispersity (Mw/Mn 3). Further, the MALLS detector (absolute molecular weights)...
Topics: DTIC Archive, Pomerantz, Martin, TEXAS UNIV AT ARLINGTON CENTER FOR ADVANCED POLYMER RESEARCH,...
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Topics: Radio Program, Industrial processes, Butter
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Methods to measure molecular weight distributions in MP pitches have been developed. Number and weight average molecular weights and their distributions have been deter-mined as a function of P.I. in MP pitches. Significant progress has been achieved during this report period both in the art of spinning very thin MP pitch filaments and in the understanding of structural changes that take place during the conversion of pitch fibers to high- performance carbon fibers.
Topics: DTIC Archive, Didchenko, Rostislav, UNION CARBIDE CORP CLEVELAND OH CARBON PRODUCTS DIV, *CARBON...
The polymer chains of a novel asymmetric polydiacetylene, namely poly((8-butoxy carbonyl) methyl urethanyl) 1-(5-pyrimidyl)-octa-1,3-diyneD), in the absence of nonlinear optically active chromophores and without recourse to poling assemble in an acentric stable polar organization upon spin coating or solution casting. Asymmetry of the side groups and the spontaneous alignment of the urethane side groups by means of hydrogen bonds appear to be responsible for this organization. An abrupt...
Topics: DTIC Archive, Kim, W H, MASSACHUSETTS UNIV LOWELL DEPT OF CHEMISTRY, *POLYMERS, *FILMS, *COATINGS,...
