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  • 1
    facet.materialart.
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    Plasma-assisted transformation of iron surfaces into magnetite (1999)
    Elsevier
    Details
    Publication Date: 1999-09-01
    Print ISSN: 0257-8972
    Electronic ISSN: 1879-3347
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Published by Elsevier
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  • 2
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    Untersuchungen zur Reaktivität von Vinyl- und Methacrylatsilan in Polyäthylen-Modellsystemen (1976)
    Springer
    Details
    Publication Date: 1976-08-01
    Print ISSN: 0372-820X
    Electronic ISSN: 1435-1536
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Published by Springer
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  • 3
    Electronic Resource
    Electronic Resource
    Untersuchungen zur Reaktivität von Vinyl- und Methacrylatsilan in Polyäthylen-Modellsystemen (1976)
    Springer
    Colloid & polymer science 254 (1976), S. 772-772 
    Details
    ISSN: 1435-1536
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01643943
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  • 4
    Electronic Resource
    Electronic Resource
    Segmented polyurethanes with 4,4′-bis-(6-hydroxyhexoxy)biphenyl as chain extender. Part 2. Synthesis and properties of MDI-polyurethanes in comparison with 2,4-TDI-polyurethanes (1996)
    Bognor Regis [u.a.] : Wiley-Blackwell
    Journal of Polymer Science Part A: Polymer Chemistry 34 (1996), S. 33-44 
    Details
    ISSN: 0887-624X
    Keywords: main-chain liquid crystal polymers ; segmented liquid crystal polymers ; synthesis ; characterization ; Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Linear segmented polyurethanes based on poly(butylene adipate)s (PBA) of different molecular weight (Mn 2000, 1000, and 600), 4,4′-diphenylmethane diisocyanate (MDI) and the mesogenic diol 4,4′-bis-(6-hydroxyhexoxy)biphenyl (BHHBP) as well as the unsegmented polyurethane consisting of MDI/BHHBP units have been synthesized and characterized by elemental analysis, 13C-NMR and SEC. The thermal behavior and the morphology were studied by DSC, polarizing microscopy, and DMA. The properties of the MDI-polyurethanes were discussed in relation to the BHHBP chain extended 2,4-TDI-polyurethanes and common 1,4-butanediol chain-extended MDI products. MDI polyurethanes based on PBA (Mn 2000) exhibit a glass transition temperature Tg of about -40°C independent of the hard segment content up to ∼50% hard segments. At higher hard segment contents increasing Tgs were observed. Polyurethanes, based on the shorter polyester soft segments PBA (Mn 1000 or 600), reveal an increase in the glass transition temperatures with growing hard segment content. The thermal transitions caused by melting of the MDI/BHHBP hard segment domains are found at 50 K higher temperatures in comparison with the analogous TDI products with mesogenic BHHBP/TDI hard segments. Shortening of the PBA chain length causes a shift of the thermal transitions to lower temperatures. Polarizing microscopy experiments indicate that liquid crystalline behavior is influenced by both the content of mesogenic hard segments and the chain length of the polyester. © 1996 John Wiley & Sons, Inc.
    Additional Material: 12 Ill.
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    Segmented polyurethanes with 4,4′-bis-(6-hydroxyhexoxy) biphenyl as chain extender. I. Synthesis and characterization of 2,4-tdi-polyurethanes (1995)
    Bognor Regis [u.a.] : Wiley-Blackwell
    Journal of Polymer Science Part A: Polymer Chemistry 33 (1995), S. 1523-1536 
    Details
    ISSN: 0887-624X
    Keywords: main-chain liquid crystalline polymers ; segmented liquid crystalline polyure-thanes ; synthesis ; characterization ; Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Polyurethanes composed of 2,4-toluene diisocyanate (TDI), poly (butylene adipate) diols (PBA) of different molecular weights, and 4,4′-bis-(6-hydroxyhexoxy) biphenyl (BHHBP) were prepared by a two-step solution polymerization process. The polyurethanes were char-acterized by elemental analysis, NMR, and SEC. The thermal properties were investigated by DSC, DMA, and optical polarizing microscopy. Dependent on the molecular weight of the PBA, a shift in the glass transition temperature Tg of the polyurethanes has been observed by DSC and DMA. Polyurethanes based on poly (butylene adipate)s of Mn ∼ 2000 exhibited a Tg nearly independent on the hard-segment content up to 50% LC hard segments, indicating the existence of mainly phase separated soft and hard segments. By shortening the PBA chain length up to 1,000 and further to 600, the Tg of the polyester soft-segment phase increases with growing hard-segment content, a consequence of enhanced interaction between the hard and soft segments. This tendency is observed to the greatest extent at polyurethanes with the shortest, polyester diol and can be interpreted as a partial miscibility or compatibility of hard and soft segments. Although in polyurethanes with PBA 2000 the mesophase can be proven at a hard-segment content of ∼ 40%, its appearance in polyure-thances prepared with PBA 1000 or PBA 600 requires a hard-segment content 〉 60%. © 1995 John Wiley & Sons, Inc.
    Additional Material: 11 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pola.1995.080330914
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  • 6
    Electronic Resource
    Electronic Resource
    Untersuchungen zur Plasmaätzung von Polymeren. V. Plasmaätzung von StyrenpolymerenTeil IV: Acta Polymerica 31 (1980) 310-315. (1981)
    Weinheim : Wiley-Blackwell
    Acta Polymerica 32 (1981), S. 48-55 
    Details
    ISSN: 0323-7648
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: Etching rates of polystyrene and caoutchouc are similar in an oxygen plasma of a radio frequency glow discharge (nonthermal plasma). It exists a range of pressure at which the difference of rates is high enough to separate insertions of caoutchouc in polystyrene by etching of the matrix. Electron microscopic patterns of plasma, solvent, chemi-oxidative etched surfaces and break interfaces of caoutchouc and polyethylene filled probes show good agreement. The structure of chalk filled polystyrene can made visible by plasma etching technique advantageously.
    Notes: Die Ätzraten von Polystyren und Kautschuk im Sauerstoffplasma einer Hochfrequenzentladung (nichtthermisches Plasma) differieren nur wenig. In einem bestimmten Druckbereich ist der Unterschied der Ätzraten jedoch groß genug, um Kautschukeinlagerungen in Polystyren durch bevorzugtes Herausätzen der Matrix freilegen zu können. Elektronen mikroskopische Aufnahmen der plasmageätzten, lösungsmittel- und chemisch-oxidativ geätzten Oberflächen sowie von Bruchflächen ergaben bei kautschuk- und polyethylengefüllten Polystyrenproben eine gute Übereinstimmung. Die Struktur kreidegefüllter Polystyrene läßt sich vorteilhaft durch plasmachemisches Ätzen freilegen.
    Additional Material: 16 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/actp.1981.010320111
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  • 7
    Electronic Resource
    Electronic Resource
    Imprägnierung von Papieren mit Phenolharzlösungen. Teil III. Modelluntersuchungen zum Imprägnierprozeß an CellulosehohlfasernTeil II: Acta Polymerica 33 (1982) 561-566. (1982)
    Weinheim : Wiley-Blackwell
    Acta Polymerica 33 (1982), S. 667-671 
    Details
    ISSN: 0323-7648
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: The impregnation of cellulose fibres with phenolic resins are influenced by viscosity (degree of condensation and concentration of solution), surface tension and diameter of capillaries qualitatively (laws of HAGEN POISEUILLE and capillaries). After drying the cellulose fibres involve pores. The film of resins at the walls of fibres is not homogeneous. It is possible that during the impregnation the polymers and the solvent are separated.
    Notes: Der Imprägnierprozeß von Hohlen Cellulosefasern mit Phenolharzlösung wird qualitativ von der Viskosität (vom Kondensationsgrad bzw. vom Molgewicht und von der Konzentration der Lösung), der Oberflächenspannung sowie dem verwendeten Kapillarradius (HAGEN-POISEUILLESCHES Gesetz, Kapillargesetz) beeinfulßt. Nach dem Trocknen verbleibt im Inneren der Cellulosehohlfasern ein Hohlraum. Die Wandbeschichtung mit Harz ist nicht homoge. Während des Imprägnierozesses tritt vermutlich eine Auftrennung in Harz und Lösungsmittel ein.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/actp.1982.010331111
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  • 8
    Electronic Resource
    Electronic Resource
    Untersuchungen zur Plasmaätzung von Polymeren. Teil II. Einfluß der Plasmaparameter auf die Abbaugeschwindigkeit und die Freilegung übermolekularer PolymerstrukturenTeil I siehe [10] (1980)
    Weinheim : Wiley-Blackwell
    Acta Polymerica 31 (1980), S. 52-58 
    Details
    ISSN: 0323-7648
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: An unmodified uncovering of structural inhomogeneities in polymers depends essentially on the selectivity of plasma etching by which weakly bound regions can be etched off. To a certain degree the selectivity of degradation can be controlled by plasma parameters. Further, the structural changes caused by plasma UV radiation (crosslinking, formation of radicals and double bonds) can be reduced by appropriate etching techniques. Considering these facts the plasma etching method can be applied for preparing highly characteristic etching patterns of the polymer structure.
    Notes: Eine wirklichkeitsgetreue Freilegung von Strukturinhomogenitäten in Polymeren hängt stark von der Selektivität der Plasmaätzung ab, mit der schwächer gebundene Polymerbereiche herausgeätzt werden können. In gewissem Umfang kann durch die Wahl der Plasmaparameter die Selektivität des Abbaus gesteuert werden. In gleicher Weise lassen sich auch die strukturverändernden Wirkungen der Plasma-UV-Strahlung (Vernetzung, Radikalbildung, Bildung von Doppelbindungen usw.) durch geeignete Ätzbedingungen verringern. Bei Beachtung dieser Gesichtspunkte liefert die Plasmaätzmethode sehr charakteristische Ätzreliefs der Polymerstruktur.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/actp.1980.010310110
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  • 9
    Electronic Resource
    Electronic Resource
    Imprägnierung von Papieren mit Phenolharzlösungen. Teil II: Rasterelektronenmikroskopische Untersuchungen zum Gehalt und zur Verteilung des Harzes im Prepreg (1982)
    Weinheim : Wiley-Blackwell
    Acta Polymerica 33 (1982), S. 561-566 
    Details
    ISSN: 0323-7648
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: The distribution of phenol formaldehyde resins in cellulose papers (cotton linter s90 g/m2) was studied by light- and scanning electronmicroscopy using plasma etching as preparation method. With increasing viscosity of the solutions of resins the wetting of the pores in the paper and fibres arises. Phenol formaldehyde resins of high viscosity also penetrate the paper completely.
    Notes: Die Phenol-Formaldehydharzverteilung im Cellulosepapier (Baumwollinters 90 g/m2) wurde mittels Licht-und Rasterelektronenmikroskopie im Zusammenhang mit der Plasmaätztechnik untersucht. Mit steigender Viskosität der Harzlösungen nimmt im untersuchten Meßbereich die Ausfüllung der Faserzwischenräume und der Hohlräume in den Fasern des Papieres zu. Auch hochviskose Phenol-Formaldehydharze durchdringen das Papier.
    Additional Material: 12 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/actp.1982.010330912
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  • 10
    Electronic Resource
    Electronic Resource
    Untersuchungen zur Plasmaätzung von Polymeren. Teil I: Strukturänderungen von Polymeren nach Plasmaätzung (1979)
    Weinheim : Wiley-Blackwell
    Acta Polymerica 30 (1979), S. 470-477 
    Details
    ISSN: 0323-7648
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: In the plasma of electrical discharges polymer samples are subjected to oxidation causing reactive sites or to degradation. Further, a significant volume (depth) effect in a 5 to 10 μm surface layer was observed which was caused by plasma UV radiation. These photolytical effects result in changes of the polymer structure, as crosslinking, change of crystallinity, radical formation etc. Therefore, the etching patterns reflect the features of secondary structures formed by these processes.
    Notes: Polymere werden im Plasma einer elektrischen Entladung an der Oberfläche funktionalisiert (oxydiert) bzw. abgebaut. Daneben wurde jeweils ein signifikanter, auf eine 5 bis 10 μm starke Schicht an der Oberfläche beschränkter Volumeneffekt („Tiefeneffekt“) beobachtet, der durch die Plasma-UV-Strahlung verursacht wird. Diese photolytischen Erscheinungen führen zu Änderungen im Polymergefüge wie Vernetzung, Veränderung der Kristallinität, Radikalbildung usw. Abbildungen von Polymerätzstrukturen spiegeln deshalb in gewissem Umfang die solchermaßen veränderte Sekundärstruktur wider.
    Additional Material: 10 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/actp.1979.010300802
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