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  • Chemistry  (11)
  • 68.70  (1)
  • Polymers  (1)
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  • 1
    Electronic Resource
    Electronic Resource
    Silicon fibers produced by high-pressure LCVD (1993)
    Springer
    Applied physics 57 (1993), S. 97-100 
    Details
    ISSN: 1432-0630
    Keywords: 61.40 ; 68.70 ; 81.10 ; 82.40
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract Using a unique fiber-growth control mechanism and high-reaction pressures (〉1 bar), silicon fibers were grown by laser-assisted chemical vapor deposition (LCVD) from silane near the focal point of a cw Nd:YAG laser beam. Fiber-growth rates ranged from 〈1 to 500 μm/s and fiber tip temperatures from 525 to 1412° C. At low fibertip temperatures (〈600° C) silicon fibers yielding glassy fracture were obtained. Some crystallinity was observed by X-ray diffraction. Polycrystalline silicon fibers were formed at intermediate temperatures, single-crystal silicon fibers at high-laser intensities and high-tip temperatures. The single crystal LCVD silicon fibers were formed by a vapor-liquid-solid (VLS) mechanism. Single-crystal VLS-LCVD silicon fibers were also obtained from liquid silicon-metal alloys by initiating fiber growth from the end of thin palladium, gold and platinum wires.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00331224
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  • 2
    Electronic Resource
    Electronic Resource
    Polymer structures and properties of new heat resistant films and fibers (1966)
    Stamford, Conn. [u.a.] : Wiley-Blackwell
    Polymer Engineering and Science 6 (1966), S. 369-372 
    Details
    ISSN: 0032-3888
    Keywords: Chemistry ; Chemical Engineering
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Commercial films, elastomers, and fibers have valuable in-use properties below 300°C. Astronautic requirements, however, may evaentually call for materials that withstand 500 hrs at 300°C or 100 hrs at 500°C while fully retaining their useful properties. The most significant advances in the synthesis and preparation of heat resistant polymer have been made since 1959 with new synthetic methods such as interfacial polymerization, cyclopolymerization, and intramolecular polymer post-cyclopolymerization, and intramolecular olymer post-cyclization reactions. It is the purpose of this paper to discuss the structural relationships among those heat resistant, orgainc polymers that were reported to give strong films and fibers. Those heat resistant polymers, which have not yet been fabricated into films and fibers are not included in this review.
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pen.760060415
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  • 3
    Electronic Resource
    Electronic Resource
    Die Chemie neuer hitzebeständiger Filme und Fasern (1964)
    Weinheim : Wiley-Blackwell
    Zeitschrift für die chemische Industrie 76 (1964), S. 484-494 
    Details
    ISSN: 0044-8249
    Keywords: Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Diese Übersicht befaßt sich vorwiegend mit den seit 1959 veröffentlichten Arbeiten über Filme polymerer Kohlenwasserstoffe, aliphatische Polyterephthalamid-Fasern, Poly-(hydroxybenzoesäure)-Filme, Polyoxadiazol-Fasern, Polybenzimidazol-Filme, Poly-(phenyltriazol)-Filme, Polypyromellitimid-Filme und schwarze Fasern aus cyclisiertem Polyacrylnitril. Alle diese Stoffe haben extrem hohe Schmelzpunkte und befriedigende Gebrauchseigenschaften bei hohen Temperaturen.
    Additional Material: 9 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/ange.19640761106
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  • 4
    Electronic Resource
    Electronic Resource
    Umsetzung von 4-Aminoantipyrin mit Derivaten des 2.2-Di-(p-hydroxyphenyl)-propans (1963)
    Weinheim : Wiley-Blackwell
    Zeitschrift für die chemische Industrie 75 (1963), S. 247-247 
    Details
    ISSN: 0044-8249
    Keywords: Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/ange.19630750506
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  • 5
    Electronic Resource
    Electronic Resource
    Aromatic polyhydrazides: A new class of highly bonded, stiff polymers (1964)
    New York : Wiley-Blackwell
    Journal of Polymer Science Part A: General Papers 2 (1964), S. 1147-1156 
    Details
    ISSN: 0449-2951
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: High-molecular weight aromatic polyhydrazides have been prepared by using isophthalic, terephthalic, isocinchomeronic, dipicolinic, 5-chloroisophthalic, 2,5-dichloroterephthalic, 5-tert-butylisophthalic, phenyl ether-4,4′-dicarboxylic, pyrazine-2,5-dicarboxylic, and thiophene-2,5-dicarboxylic acid as polymer intermediates. The polyhydrazides were prepared from equimolar amounts of diacid chloride and dihydrazide (or hydrazine) in hexamethylphosphoramide at room temperature. By contrast to aliphatic polyhydrazides, aromatic polyhydrazides were soluble in dimethyl sulfoxide and with few exceptions had polymer melt temperatures in the range of 350-400°C. Inherent viscosities ranged from 0.30 to 1.00 (in dimethyl sulfoxide). Tough films and strong fibers of these polymers could be fabricated.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1964.100020312
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  • 6
    Electronic Resource
    Electronic Resource
    Poly(1,3,4-oxadiazolidine) (1964)
    New York : Wiley-Blackwell
    Journal of Polymer Science Part A: General Papers 2 (1964), S. 1181-1183 
    Details
    ISSN: 0449-2951
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Poly(3,4-isophthaloyl-1,3,4-oxadiazolidine) was prepared from poly(isophthalic dihydrazide) by treatment by reaction with formic acid in dimethylsulfoxide as high-molecular weight film-forming polymer. Under thermal treatment with the evolution of formaldehyde and water, high yields of chemically pure poly[1,3-phenylene-2,5-(1,3,4-oxadiazole)] were obtained.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1964.100020315
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  • 7
    Electronic Resource
    Electronic Resource
    Poly(1,3,4-oxadiazole) fibers: New fibers with superior high temperature resistance (1964)
    New York : Wiley-Blackwell
    Journal of Polymer Science Part A: General Papers 2 (1964), S. 1171-1179 
    Details
    ISSN: 0449-2951
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: A polyoxidiazole fiber, alt. poly[1,3-/1,4-phenylene-2,5-(1,3,4-oxadiazole)], with excellent thermal stability was prepared from poly(isophthalic-terephthalic hydrazide) fiber by thermal cyclodehydration. Conversion of this polyhydrazide fiber proceeded at 280°C. in a muffle furance under positive nitrogen pressure and was completed in 48-72 hr., as evidenced by elemental analyses. The resulting polyoxadiazole fiber had the following typical fiber properties: T/E/Mi/den. = 2.6/3.1/124/3.1. It was thermally stable when exposed for prolonged periods of time at temperatures of 400°C. During heat treatment between 300 and 400°C. the initial polyoxadiazole fiber undergoes a structural change and final properties were: T/E/Mi/den. ∼ 1.5/1.5/90/3.0. The polyoxadiazole structure was found to degrade severely at 450°C.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1964.100020314
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  • 8
    Electronic Resource
    Electronic Resource
    Aliphatic polyhydrazides: A new low temperature solution polymerization (1964)
    New York : Wiley-Blackwell
    Journal of Polymer Science Part A: General Papers 2 (1964), S. 1137-1145 
    Details
    ISSN: 0449-2951
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: High molecular weight polyhydrazides have been prepared by a new low temperature polymerization technique from equimolar amounts of a dihydrazide and a dicarbonyl chloride in dialkyl amide solvents. All-aliphatic polyhydrazides were insoluble in dimethyl sulfoxide, had polymer melt temperatures ranging from 200 to 300°C. Films could be pressed and fibers could be pulled from the melt. Aliphatic-aromatic and oxalic-aromatic polyhydrazides which undergo dehydration at different rates had polymer melt temperatures ranging from 250 to 300°C. and inherent viscosities ranging from 0.3 to 1.5. They were soluble in dimethyl sulfoxide, a solvent from which tough films could be cast.
    Additional Material: 3 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1964.100020311
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  • 9
    Electronic Resource
    Electronic Resource
    Poly(1,3,4-oxadiazoles): A new class of polymers by cyclodehydration of polyhydrazides (1964)
    New York : Wiley-Blackwell
    Journal of Polymer Science Part A: General Papers 2 (1964), S. 1157-1169 
    Details
    ISSN: 0449-2951
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Thirteen aliphatic and aromatic polyhydrazides have been converted as bulk polymer by a unique polymer by a unique polymer post reaction into high molecular weight poly(1,3,4-oxadiazoles). This reaction proceeds by thermal cyclodehydration at 170-280°C. with elimination of water. The resulting poly(1,3,4-oxadiazoles) have been characterized by microanalysis, inherent viscosity, x-ray diffraction patterns, and by infrared and ultraviolet absorption spectra. Films could be pressed from the melt of polyoxadiazoles melting below 350°C., while very high melting or infusible aromatic polyoxadiazoles could not be manufactures into films and fibers by conventional means. Such polymers are extremely thermally and oxidatively stable and decompose between 450 and 500°C.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1964.100020313
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  • 10
    Electronic Resource
    Electronic Resource
    Metal chelates of polyhydrazides (1964)
    New York : Wiley-Blackwell
    Journal of Polymer Science Part A: General Papers 2 (1964), S. 1825-1832 
    Details
    ISSN: 0449-2951
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Two all-aromatic polyhydrazides have been investigated with respect to their propensity to form metal-chelate bulk polymer, films, and fibers. The aromatic polyhydrazide derived from isophthalic acid was found to give chelate bulk polymer with Ni+2, Ca+2, Ag+1, Hg+2, Pb+2, Zn+2, Cd+2, and Cu+2 which analyze for a 1:1 ratio of hydrazide link:metal ion. Films of the polyhydrazide-metal chelate were prepared by soaking polyhydrazide films in dimethylformamide solutions of metal salts. Tough fibers of the polyhydrazide-metal chelates with such metal ions as Cr+3, Co+2, and Ag+1 were prepared by passing polyhydrazide fiber through dimethylformamide solutions of these metal salts.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1964.100020423
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