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  • 1
    Electronic Resource
    Electronic Resource
    Ultra-high strength and ultra-high modulus fibers from polyethylene (1984)
    Springer
    Polymer bulletin 12 (1984), S. 287-292 
    Details
    ISSN: 1436-2449
    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: Summary Using the method of hot drawing developed earlier, an attempt has been made to obtain ultra-high modulus and ultrahigh strength PE filaments from original filaments produced by the “surface growth” technique. The average tensile strength of the drawn fibers reaches 5.5 GPa and the value of modulus measured in a dead loading creep experiment is estimated to be 44 GPa. 13 % of the drawn specimens had extremely high tensile strength close to theoretical estimates. The great scatter of the tensile strength data is attributed to the kink-band formation in the specimens due to their bending during preparation or during drawing.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00263140
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  • 2
    Electronic Resource
    Electronic Resource
    Thermoreversible gelation of polyacrylonitrile/dimethylformamide-solution (1993)
    Springer
    Colloid & polymer science 271 (1993), S. 436-445 
    Details
    ISSN: 1435-1536
    Keywords: Polyacrylnitrile ; dimethylformamide ; gelation ; critical gel concentration ; junction zones
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract The thermoreversible gelation of semi-diluted atactic polyacrylnitrile (PAN)/dimethylformamide (DMF)-solutions has been studied. The structural features of PAN/DMF-gels, formed by supercooling have been investigated by DSC-, x-ray- and swelling measurements. A new structural model has been introduced to describe the morphology of the junction zones of PAN/DMF-gels and to also explain the gelation behavior of PAN/DMF-solutions as the structural features of PAN/DMF-gels. The junction zones of a PAN/DMF-gel have been defined as “ordered junction zones”. A gelation enthalpy of about 〈ΔH〉=−6 kJ/mol supports the idea that an ordered junction zone is formed by intermolecularly neighboring stereoregular parts of atactic PAN chains due to a nucleation process in the solution. It can be defined as a strongly distributed fringed micelle.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00657387
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  • 3
    Electronic Resource
    Electronic Resource
    Direct electron microscope investigation of the morphology of surface-growth polyethylene filaments before and after zone-drawing (1987)
    Springer
    Journal of materials science 6 (1987), S. 1336-1338 
    Details
    ISSN: 1573-4811
    Source: Springer Online Journal Archives 1860-2000
    Topics: 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/BF01794610
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  • 4
    Electronic Resource
    Electronic Resource
    DSC investigation of high-strength and high-modulus polyethylene fibers (1988)
    Springer
    Journal of thermal analysis and calorimetry 33 (1988), S. 1171-1176 
    Details
    ISSN: 1572-8943
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung Durch strömungsinduzierte Kristallisation wurden Fasern aus zwei kommerziellen linearen Polyethylenen (PE) unterschiedlichen Molekulargewichts dargestellt. DSC-Messungen mit einem Temper- und Schmelzprogramm zeigten 4 Schmelzpeaks. Der erste — bei der niedrigsten Temperatur — entspricht dem Schmelzen von lamellar kristallisiertem PE. Peak 2 zeigt das Schmelzen des kristallinen Hauptanteils der Fasern, Peak 3 und 4 das Schmelzen der erzwungenen kristallinen Bereiche. Die Schmelztemperaturen hängen vom Molekulargewicht des Fasermaterials und seinem Verstreckungsgrad ab.
    Abstract: РЕжУМЕ МЕтОДОМ кРИстАллИжА цИИ В стРУЕ пОлУЧЕНы ВОлОкНА Иж ДВУх пРОДА жНО ДОстУпНых сОРтОВ лИНЕИНОгО пОл ИЁтИлЕНА с РАжлИЧНыМ МОлЕкУльРНыМ ВЕсОМ. Д ск ИжМЕРЕНИь БылИ пРО ВЕДЕНы В пРОгРАММЕ ОтжИгА И п лАВлЕНИь. УстАНОВлЕН О ЧЕтыРЕ пИкА плАВлЕНИь. пЕРВы И пИк с НАИБОлЕЕ НИжкОИ тЕМпЕРАтУРОИ ИДЕНтИФИцИРОВАН кАк пИк плАВлЕНИь кРИстАллИ ЧЕскОгО пОлИЁтИлЕНА с лАМЕлльРНОИ стРУкт УРОИ. ВтОРОИ пИк сООтВ ЕтстВУЕт плАВлЕНИУ ОсНОВНОИ к РИстАллИЧЕскОИ ФРАкцИИ ВОлОкНА, А тРЕ тИИ И ЧЕтВЕРтыИ пИкИ - п лАВлЕНИУ кРИстАллИЧЕскИ НАпР ьжЕННых ОБлАстЕИ. тЕМпЕРАтУРы плАВлЕН Иь жАВИсьт От МОлЕкУл ьРНОгО ВЕсА пОлИЁтИлЕНОВОгО ВОл ОкНА И стЕпЕНИ ЕгО ВытьНУтОстИ.
    Notes: Abstract Fibers were produced from two commercial grade linear polyethylenes (PE) of different molecular weight by flow-induced crystallization. DSC measurements were carried out with an annealing and melting program lour melting peaks were found. The first peak, at the lowest temperature, can be identified with the melting of lamellar crystallized PE. Peak 2 corresponds to the melting of the main crystalline fraction of the fiber. and peaks 3 and 4 to the melting of constrained crystalline regions. The melting temperature depends on the molecular weight of the fiber material and on the drawing state.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01912746
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  • 5
    Electronic Resource
    Electronic Resource
    Zur übermolekularen Struktur hochmoduliger scherkristallisierter Polyethylen-FädenHerrn Professor Dr. Dr. h. c. Hermann Klare zum 80. Geburtstag gewidmet (1989)
    Weinheim : Wiley-Blackwell
    Acta Polymerica 40 (1989), S. 308-314 
    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 supermolecular structures of polyethylene filaments prepared by crystallization from solution in extensional flow at different crystallization temperatures as well as of annealed and zone-drawn samples have been characterized by means of X-ray diffraction methods. The lattice distortions in the crystallites of such samples are quantitatively determined for the first time. The results show that a direct correlation between the crystallite dimensions and the amount of lattice distortions on the one hand and the axial Young's modulus on the other hand can be excluded. Based on X-ray, mechanical and shrinkage investigations, some parameters of the structure of the non-crystalline regions are estimated. A structure model for the high-modulus polyethylene filaments is discussed.
    Notes: Die übermolekulare Struktur scherkristallisierter PE-Fäden unterschiedlicher Kristallisationstemperatur sowie getemperter und zonengereckter Proben wird mittels Röntgenbeugung charakterisiert. Erstmalig an derartigen Fäden werden die Gitterstörungen in den Kristalliten quantitativ angegeben. Die Ergebnisse zeigen, daß ein direkter Zusammenhang zwischen den Kristallitgrößen und dem Ausmaß der Gitterstörungen einerseits und dem axialen E-Modulandereseits ausgeschlossen werden kann. Auf Basis von Röntgen-, Modul- und Schrumpfmessungen werden Abschätzungen zum Aufbau der ungeordneten Bereiche durchgeführt und daraus Modellvorstellungen zur Struktur hochmoduliger PE-Fäden mitgeteilt.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/actp.1989.010400504
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  • 6
    Electronic Resource
    Electronic Resource
    Untersuchungen zum Schmelzverhalten von hochgeordneten Polymermaterialien als Mittel zur Strukturcharakterisierung. Teil 1. Schmelz- und Rekristallisationsverhalten von oberflächengesponnenem PolyethylenHerrn Professor Dr. habil. Burkart Philipp zum 60. Geburtstag gewidmet (1985)
    Weinheim : Wiley-Blackwell
    Acta Polymerica 36 (1985), S. 110-114 
    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: Under the condition of inhibited shrinking the dynamic melting and recrystallization was investigated by differential scanning calorimetry with polyethylene. The melting of regions having different order was found to be not independent.
    Notes: An oberflächengesponnenem Polyethylen-Fadenmaterial wird unter Bedingungen verhinderten Schrumpfes das dynamische Schmelz- und Rekristallisationsverhalten mittels Differentialkalorimetrie untersucht. Anteile unterschiedlicher Ordnung schmelzen nicht unabhängig voneinander.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/actp.1985.010360212
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  • 7
    Electronic Resource
    Electronic Resource
    Flüssig-kristalline Zustände in Cellulose- und Cellulosederivatlösungen (1984)
    Weinheim : Wiley-Blackwell
    Acta Polymerica 35 (1984), S. 83-88 
    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: A literature review is presented on the methods of characterization of the mesomorphic structures occuring in solutions of cellulose and cellulose derivatives. Experiments performed by the authors with the aim to characterize the liquidcrystalline states in solutions of cellulose derivatives allow the comparative estimation of the validity of current methods and complete the experience gained with these solutions.
    Notes: In einer Literaturübersicht wird der Kenntnisstand zu Fragen der Charakterisierung mesomorpher Strukturen in Cellulose- und Cellulosederivatlösungen zusammengestellt. Eigene experimentelle Untersuchungen zur Charakterisierung des flüssig-kristallinen Zustandes von Cellulosederivatlösungen sollen die Eignung vorhandener Charakterisierungsmethoden demonstrieren und Erfahrungen für den Umgang mit diesen Stoffsystemen vermitteln.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/actp.1984.010350119
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  • 8
    Electronic Resource
    Electronic Resource
    Handbook of multiphase systems. Hg. von G. Hetsroni. Washington/New York/London: Hemisphere Publishing Corporation; New York: Mcgraw-Hill Book Company 1982. XX u. 1505 S., geb. DM 187,10. (1983)
    Weinheim : Wiley-Blackwell
    Acta Polymerica 34 (1983), S. 380-380 
    Details
    ISSN: 0323-7648
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/actp.1983.010340618
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  • 9
    Electronic Resource
    Electronic Resource
    The strength and stiffness of polymers. Hg. von ANAGNOSTIS E. ZACHARIADES und ROGER S. PORTER. Bd. 4 der Reihe „Plastics Engineering“. ISBN 0-8247-1846-1. New York/Basel: Marcel Dekker, Inc. 1983. X. 382 S., geb. SFr 149.- (1985)
    Weinheim : Wiley-Blackwell
    Acta Polymerica 36 (1985), S. 296-296 
    Details
    ISSN: 0323-7648
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/actp.1985.010360521
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  • 10
    Electronic Resource
    Electronic Resource
    Strukturbildung in flexibelkettigen Polymeren zur Erzielung spezieller mechanischer Eigenschaften (1989)
    Weinheim : Wiley-Blackwell
    Acta Polymerica 40 (1989), S. 197-206 
    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: Starting from the fundamental opportunities and regularities to produce high strength/high modulus materials from polymers, results will be presented concerning the mechanical properties and the structure formation of fibres and foils obtained by different methods of preparation as well as aspects of application. The zone-drawing of poly(ethylene terephthalate), the flow-controlled crystallization of polyethylene in solution, and the gel-spinning of ultrahigh molecular weight polyethylene will be described in detail.
    Notes: Ausgehend von den grundsätzlichen Möglichkeiten, die Polymere für die Herstellung hochfester/hochmoduliger Werkstoffe bieten, und auf der Grundlage der Gesetzmäßigkeit polymerer Strukturbildung werden an Beispielen verschiedener Herstellungs- und Modifizierungsverfahren für Fäden und Folien Ergebnisse zu den damit erzielbaren mechanischen Eigenschaften und sich ausbildenden Strukturen sowie zum Einsatz solcher Fäden in Verbunden vorgestellt. Dabei wird insbesondere auf die Möglichkeiten des Zonenreckens von Poly(ethylenterephthalat), auf die Lösungskristallisation gescherter Polyethylenlösungen sowie auf das Gelspinnen ultrahochmolckularen Polyethylens eingegangen.
    Additional Material: 11 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/actp.1989.010400307
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