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  • 1
    Electronic Resource
    Electronic Resource
    Azulene unit fused cyclopentadienide, fulvene and calicene (1984)
    s.l. : American Chemical Society
    Journal of the American Chemical Society 106 (1984), S. 6383-6388 
    Details
    ISSN: 1520-5126
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ja00333a047
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  • 2
    Electronic Resource
    Electronic Resource
    Electronic structure of cyclic bicalicenes (1986)
    s.l. : American Chemical Society
    Journal of the American Chemical Society 108 (1986), S. 7032-7038 
    Details
    ISSN: 1520-5126
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ja00282a031
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  • 3
    Electronic Resource
    Electronic Resource
    Magnetic properties of metal layer deposited by reduction of metal ions contained in polymer with applying magnetic field (2000)
    Springer
    Journal of polymer research 7 (2000), S. 57-61 
    Details
    ISSN: 1572-8935
    Keywords: Metal deposition ; Polyacrylonitrile ; Magnetic field ; Coercivity ; Flux density
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract Metal layer was deposited by the reduction of NiCl2 and CoCl2 in polyacrylonitrile film after applying an external magnetic field in directions parallel and perpendicular to the surface of the film; the magnetic properties of the metal-deposited film were investigated. When the parallel magnetic field was applied, the values of coercivity (Hc), remanent flux density (Br) and maximum flux density (Bs) increased regardless of the composition of the metal ions, compared with the case without the application of the magnetic field. From the scanning electron micrographs and X-ray diffraction analyses, it was shown that the growth of crystalline orientation in the deposited metals was enhanced by applying a parallel magnetic field.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s10965-006-0104-1
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  • 4
    Electronic Resource
    Electronic Resource
    Oxidation Property of CoNiCrAlY Coatings Prepared by Various Thermal Spraying Techniques (2006)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 522-523 (Aug. 2006), p. 339-344 
    Details
    ISSN: 1662-9752
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: To protect various gas turbine components against high temperature in the hot sections of powergeneration plants and aircraft engines, thermal barrier coatings (TBC’s) have been developed andwidely used. Conventional TBC’s consist of a MCrAlY (M: Ni, Co, NiCo, etc,) bond coating foroxidation resistance and a ceramic top coating for thermal insulation. High quality coatings ofMCrAlYs have been produced mostly by low pressure plasma spraying but other more economicalprocesses are also used depending on the operating conditions of the component to be coated. Inthis study, CoNiCrAlY powders were deposited on Inconel 718 substrate with three types sprayingsystem, i.e., low pressure plasma spraying, high velocity oxy-fuel spraying, and atmosphere plasmaspraying. Specimens were isothermally tested for up to 100 h in air at 1373 K. Mass gain of thecoatings was measured. Microstructure of the coating cross sections and the surface oxides wereobserved with SEM. To identify the crystal structure of the formed oxides, the specimens wereanalyzed by XRD from the surface
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/13/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.522-523.339.pdf
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  • 5
    Electronic Resource
    Electronic Resource
    Synthesis, properties and crystallization behavior of poly(ether ether ketone)/poly(phenolphthalein ether sulfone) block copolymers (1996)
    Weinheim : Wiley-Blackwell
    Angewandte Makromolekulare Chemie 238 (1996), S. 191-206 
    Details
    ISSN: 0003-3146
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: Poly(etheretherketon) (PEEK)/Poly(phenolphthaleinethersulfon) (PPES)-Blockcopolymere mit PPES-Anteilen zwischen 12 und 44% wurden durch Kondensation von fluorterminierten PEEK-Oligomeren und hydroxyterminierten PPES-Oligomeren hergestellt. Die Abhängigkeit der Copolymereigenschaften von der Zusammensetzung wurde untersucht. Die Copolymeren erwiesen sich als homogen, die Komponenten zeigten gute Verträglichkeit ohne Mikrophasenseparation. Die Copolymeren kristallisierten wie PEEK mit rhombischer Struktur. Der Kristallisationsgrad der Copolymeren was gering und nahm mit steigendem PPES-Gehalt rasch ab. Im Ver-gleich zur Kristallstruktur von PEEK wurden für die Längen der a- und b-Achsen des Copolymer-Kristallgitters - und somit auch für das Zellvolumen - größere Werte gefunden. Die Analyse der isothermen Kristallisationskinetik der Copolymeren ergab für den Avrami-Exponenten einen Wert von 2,0. Mit steigendem PPES-Gehalt der Copolymeren erhöhten sich die Glasübergangstemperaturen stark, die thermische Stabilität nahm jedoch ab. Die PEEK/PPES-Blockcopolymeren ziegten gute mechanische Eigenschaften wie hohe Zugfestigkeiten und Elastizitätsmoduli.
    Notes: Poly(ether ether ketone) (PEEK)/poly(phenolphthalein ether sulfone) (PPES) block copolymers were synthesized by a condensation reaction of fluorine-terminated PEEK oligomers and hydroxy-terminated PPES oligomers. The content of PPES in the copolymers was varied from 12 to 44 wt.-%, and the effect of the compositional variation on the properties was investigated. Microphase separation was not observed and the copolymers formed a homogeneous system having good compatibility. The crystal structure of the copolymers is rhombic, equal to PEEK. The degree of crystallinity of the copolymers was low and decreased rapidly with the increase of PPES content. Concerning the cell parameters of the crystalline unit, a- and b-axes are apparently longer and V is, thus, also larger compared with PEEK. Analyses of the isothermal crystallization kinetics of the copolymers provided an Avrami exponent (n) of 2.0. The glass transition temperature (Tg) of the copolymers greatly rose but the thermal stability became much poorer with the increase of PPES content. PEEK/PPES block copolymers possess good mechanical properties such as high strength and modulus.
    Additional Material: 9 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/apmc.1996.052380116
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  • 6
    Electronic Resource
    Electronic Resource
    Metallization of poly(vinylidene fluoride) by reduction of polymer-incorporated metal ions (1997)
    Weinheim : Wiley-Blackwell
    Angewandte Makromolekulare Chemie 253 (1997), S. 183-191 
    Details
    ISSN: 0003-3146
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: Die Metallisierung von Filmen aus Polyvinylidenfluorid (PVdF) durch Reduzieren eingelagerter Metallchloride und -perchlorate mit wässeriger NaBH4-Lösung wurde untersucht. Die Leitfähigkeit der abgeschiedenen Metallschichten nahm bezüglich des Kations und des Anions in der Reihenfolge Cu2+ 〉 Ni2+ 〉 Co2+ 〉 Fe3+ bzw. Cl- 〉 ClO-4 ab. Die hohe Leitfähigkeit der mit CuCl2 erhaltenen Schicht wird damit erklärt, daß bei der Reduktion, im Gegensatz zur Bildung von Metallboriden bei CoCl2 und NiCl2 und Oxidation bei FeCl3, keine Nebenreaktionen ablaufen und die Oberfäche der Cu-Schicht sehr eben ist.
    Notes: The metallization of poly(vinylidene fluoride) (PVdF) films by reduction of polymer-incorporated metal chlorides and perchlorates with an aqueous NaBH4 solution was investigated. The conductivity of the metal layers deposited by reduction decreased in the order Cu2+ 〉 Ni2+ 〉 Co2+ 〉 Fe3+ regarding the metal cation, and in the order of Cl- 〉 ClO-4 regarding the counter anion. The high conductivity of the Cu layer deposited from PVdF containing CuCl2 is thought to be attributed to the facts that no side-reaction occurs during the reduction in contrast to the formation of metal boride in CoCl2 and NiCl2 systems and iron oxides in FeCl3 system, and the surface of the Cu layer is smooth as compared with that obtained with the Cu(ClO4)2 system.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/apmc.1997.052530114
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  • 7
    Electronic Resource
    Electronic Resource
    Synthesis and properties of poly(ether ether ketone)/4,4′-dihydroxydiphenyl sulfone multiblock copolymers (1997)
    Weinheim : Wiley-Blackwell
    Angewandte Makromolekulare Chemie 250 (1997), S. 93-104 
    Details
    ISSN: 0003-3146
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: Poly(etheretherketon) (PEEK)/4,4′-Dihydroxydiphenylsulfon (DHDPS)-Multiblock-Copolymere mit Diphenyloxysulfon(DPOS)-Gehalten zwischen 4,9 und 36,6 Gew.-% wurden aus DHDPS und fluorterminierten PEEK-Oligomeren hergestellt. Das zahlenmittlere Molekulargewicht (Mn) der PEEK-Oligomeren variierte zwischen 470 und 4900. Der Einfluß der Zusammensetzung auf die Eigenschaften der Copolymeren wurde untersucht. Es wurde keine Mikrophasenseparation beobachtet. Die Copolymeren bildeten ein homogenes System mit guter Phasenverträglichkeit. Bei den Copolymeren mit höchstens 23,1 Gew.-% DPOS wurde eine kristalline Struktur beobachtet. Röntgenweit- und Kleinwinkelstreumessungen ergaben eine rhombische Kristallstruktur, wie sie auch bei PEEK gefunden wird. Die Verteilung der Schichtdicken der kristallinen und amorphen Regionen ist relativbreit. Mit Zunahme des DPOS-Gehalts (oder der Abnahme des zahlenmittleren Molekulargewichts der PEEK-Segmente) nahmen der Kristallinitatsgrad und der Schmelzpunkt der Copolymeren ab, und die Glastemperatur (Tg) nahm schrittweisezu.
    Notes: Poly(ether ether ketone) (PEEK)/4,4′-dihydroxydiphenyl sulfone (DHDPS) multiblock copolymers with a content of the diphenoxysulfone (DPOS) moiety between 4.9 and 36.6wt.-% were synthesized by the reaction of DHDPS and fluorine-terminated PEEK oligomers. The number-average molecular weight of PEEK oligomers (Mn) was varied from 470 to 4900. The effect of the compositional variation on the properties was investigated. Microphase separation was not observed. The copolymers formed a homogeneous system having good compatibility. The copolymers whose DPOS contents are not exceeding 23.1 wt.-% (Mn of PEEK segment ≥ 865) have crystalline structure.From the measurements of wide- and small-angle X-ray scatterings it was revealed that the crystal structure of the copolymers is rhombic, equal to PEEK, and the distribution of the thickness of the crystalline and amorphous regions is very broad. The degree of crystallinity and the melting point of the copolymers decreased and the glass transition temperature (Tg) gradually rose with the increase of the DPOS content (or the decrease of Mn of the PEEK segment).
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/apmc.1997.052500107
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  • 8
    Electronic Resource
    Electronic Resource
    Relationship between molecular structure and thermal properties of poly(aryl ether ketone)s (1997)
    Weinheim : Wiley-Blackwell
    Macromolecular Rapid Communications 18 (1997), S. 99-105 
    Details
    ISSN: 1022-1336
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Five kinds of poly(aryl ether ketone)s (PAEKs) having para-substituted linear molecular chains were synthesized via nucleophilic substitution reaction of the corresponding difluoro- and dihydroxy-compounds. The glass transition temperature and melting temperature of the PAEKs measured through differential scanning calorimetry in addition to those of other PAEKs reported are approximately proportional to the logarithm of the ratio of the mole fractions of ketone and ether groups in the repeating unit of the PEAKs. On the other hand, this ratio does not affect the crystal structure of the PAEKs.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/marc.1997.030180205
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  • 9
    Electronic Resource
    Electronic Resource
    The molecular structure and polarizabilities of poly(aryl ether ketone)s (1996)
    Weinheim : Wiley-Blackwell
    Macromolecular Theory and Simulations 5 (1996), S. 347-356 
    Details
    ISSN: 1022-1344
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: The molecular structure and polarizabilities of poly(aryl ether ketone)s were investigated with quantum chemical calculations, based on the fully optimized structures of model compounds (S5: ArCOArOArOArCOAr and BS6: ArOArCOArArCOArOAr) for their chain segments. The results showed that the average dihedral angle between their aromatic rings was in the range of 36°-37° relative to the molecular zig-zag plane. Especially, when a biphenyl group was introduced into the molecular chain of this polymer, its two aromatic rings were distorted by 48.0° to each other. Also, the calculation results of refractive indices for pure crystals obtained by using the structural parameters were in good accordance with those reported in the literature.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mats.1996.040050214
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  • 10
    Electronic Resource
    Electronic Resource
    Dynamic mechanical behavior of poly(ether ether ketone)/poly(ether sulfone) block copolymers (1996)
    Weinheim : Wiley-Blackwell
    Macromolecular Chemistry and Physics 197 (1996), S. 1495-1502 
    Details
    ISSN: 1022-1352
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Poly(ether ether ketone) (PEEK)/poly(ether sulfone) (PES) block copolymers were synthesized via condensation reaction between fluorine-terminated PEEK oligomers and hydroxyl-terminated PES oligomers. The dynamic mechanical behavior of a composite sample prepared by compression molding of a glass fibre cloth and the copolymer was investigated by means of a dynamic viscoelastometer. The β relaxation peak and the α′ relaxation peak were observed in the logarithmic decrement curve of the amorphous block copolymer of PEEK/PES. The glass transition temperature (β relaxation peak) is shifted to higher temperature and approaches a constant value as annealing time and degree of crystallinity increase. The glass transition temperature of the copolymer rises more slowly upon annealing with increasing PES content. The α′ relaxation peak becomes smaller upon annealing, and eventually disappears. The α′ relaxation peaks are related to the motion of molecules upon transition from the non-crystalline to the crystalline state. The α′ relaxation occurs for the copolymer with a degree of crystallinity of 0 to 3%.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1996.021970426
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