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  • Polymer and Materials Science  (15)
  • 2025-2025
  • 1980-1984  (15)
  • 1
    Electronic Resource
    Electronic Resource
    Verbrauchssenkung für großtechnische NH3-Anlagen durch Wärmerückgewinnung im Abhitzesystem (1984)
    Weinheim : Wiley-Blackwell
    Chemie Ingenieur Technik - CIT 56 (1984), S. 356-360 
    Details
    ISSN: 0009-286X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Energy savings in industrial NH3 plant by heat recovery in the waste heat system. Minimization of energy consumption is nowadays a primary goal in the design of NH3 plant. In this context two aspects are particularly important: first, the process steps and their combination must be selected in such a way that the level of energy that has to be supplied to the plant is kept low from the very beginning; second, heat recovery must be optimized by the choice of process conditions and use of appropriate equipment. An industrial NH3 plant built according to these principles can operate at a consumption of as low as 29.5 GJ/t NH3, using proven processes and equipment. The first plant of this new generation with a capacity of 1120 t/d is currently under construction for Canadian Industries Ltd. (CIL) in Canada.
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cite.330560504
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  • 2
    Electronic Resource
    Electronic Resource
    Herstellen von Hochmodulfäden aus PolyethylenVorgetragen auf dem Hamburger Makromolekularen Symposium 16. - 18. September 1980. (1981)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 182 (1981), S. 637-642 
    Details
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1981.021820232
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  • 3
    Electronic Resource
    Electronic Resource
    Photoinitiators and photoinitiation, 3Part 2: H. J. Hageman, Makromol. Chem., Rapid Commun. 2, 517 (1981). Comparison of the photodecompositions of α-methoxy- and α,α-dimethoxydeoxybenzoin in 1,1-diphenylethylene as model substrate (1982)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 183 (1982), S. 281-292 
    Details
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: The photodecomposition of α-methoxydeoxybenzoin (1) and α,α-dimethoxydeoxybenzoin (2) was investigated both in the absence and in the presence of 1,1-diphenylethylene. The resulting products indicate that benzoyl radicals add to the olefinic double bond (initiation of polymerization), whereas the α-methoxybenzyl radicals generated from 1 do not add to the olefinic double bond (no initiation), but preferentially combine with other radicals (termination of polymerization). This reaction is largely suppressed in the case of α,α-dimethoxybenzyl radicals generated from 2 owing to sequential fragmentation into inactive methylbenzoate and highly reactive methyl radicals which add to the olefinic double bond and thus contribute to the initiation.
    Additional Material: 5 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1982.021830202
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  • 4
    Electronic Resource
    Electronic Resource
    29Si NMR-untersuchungen an polykieselsäureestern (1983)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 184 (1983), S. 1817-1822 
    Details
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Linear and branched siloxanes were prepared by partial hydrolysis of silicon tetrachloride and by esterification of the products of hydrolysation with methyl and ethyl nitrite. 29Si NMR spectra made it possible to distinguish between the isomers of each oligomer up to the heptamer. Linear relationships between the 29Si chemical shifts of the ethyl and the methyl esters on one hand and between the ethyl esters and the poly(silicic acid)s on the other hand were observed. However, due to the different effect of neighboring building units, there are only poor relationships between the 29Si data of the esters and the chloro derivatives.
    Additional Material: 3 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1983.021840906
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  • 5
    Electronic Resource
    Electronic Resource
    Block copolymers by radical polymerization 3Part 2: cf.4.. Block copolymers of styrene, methyl acrylate, n-methyl-n-vinylacetamide, 1-vinyl-2-pyrrolidone (1982)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 183 (1982), S. 1685-1700 
    Details
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: A polyazoinitiator obtained from 2,2′-azoisobutyronitrile (AIBN) and a diol is used to prepare block copolymers according to the Smets procedure. Partial decomposition of the polyazoinitiator in presence of a monomer results in an azogroup-containing prepolymer. Block copolymers are obtained decomposing the remaining azo groups in presence of a second monomer. Examples investigated are styrene/methyl acrylate, styrene/N-methyl-N-vinylacetamide, methyl acrylate/N-methyl-N-vinylacetamide, 1-vinyl-2-pyrrolidone/acrylonitrile. Homopolymers are produced simultaneously. Up to 70% of block copolymers are formed in these reactions. Block copolymers of styrene/methyl acrylate have hard/soft segmented molecules. It is an elastic material with spherical, cylindrical and lamellar, resp. domain structures, depending on the composition.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1982.021830710
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  • 6
    Electronic Resource
    Electronic Resource
    End groups in poly(vinyl chloride) and their influence on the thermal stability (1983)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 184 (1983), S. 2261-2273 
    Details
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: End groups in a low molecular weight fraction of a commercial suspension poly(vinylchloride) were analysed by means of 1H NMR and IR spectroscopy and by size exclusion chromatography. The following groups were identified and quantified: ethoxycarbonyloxy (1), 1,2-dichloroethyl (2), trans- and cis-4-chloro-2-butenyl (3 and 4), 2-chloroethyl (5), and 2-chloroethylidene (6). The influence of these groups on the degradation at 180°C was determined.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1983.021841108
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  • 7
    Electronic Resource
    Electronic Resource
    The effects of thermooxidative aging on the fatigue behavior of a structural adhesiveCorrected proofs received September 19, 1984 (1984)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 29 (1984), S. 3499-3511 
    Details
    ISSN: 0021-8995
    Keywords: Chemistry ; Polymer and Materials Science
    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: The kinetics of autoxidation of FM-73U, a rubber-modified epoxy adhesive, were investigated by Fourier transform infrared analysis. Absorbance spectra for thin samples aged in hot, moist, oxygen-rich environments were used to assess a plausible reaction mechanism; rate constants, Arrhenius plots, and oxidation rates were determined. Concurrently, crack growth rates were measured on specimens which had been exposed to similar environments for periods of up to 8 months. Paris parameters measured in these tests were correlated with the results of the oxidation studies. These correlations were used to predict the crack growth rate of the adhesive after 10 years of aging in ambient conditions. Although the prediction indicates that the adhesive becomes more brittle with age, the changes are not severe.
    Additional Material: 10 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1984.070291125
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  • 8
    Electronic Resource
    Electronic Resource
    Charakterisierung der verbundhaftung in glasfaserverstärktem polycarbonat durch die schallemissionsanalyseHerrn Prof. Dr. Otto Bayer in memoriam gewidmet (1982)
    Weinheim : Wiley-Blackwell
    Angewandte Makromolekulare Chemie 108 (1982), S. 113-121 
    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: The influence of weathering and storage in water on the fracture behaviour of glass fibre reinforced polycarbonates was investigated. It was shown, that the stability of adhesion between polymer matrix and glass fibres can be characterized by a multichannel analysis of accoustic emission during a bending test. The interpretation is based on comparisons between accousting emission data, stress-deformations curves and results of scanning electron microscopy.From the dependence of the accoustic emission data and the viscosity ratios on the time of weathering and water storage follows, that the initial decrease of impact resistance an is caused mainly by embrittlement of the polycarbonate matrix. After prolonged exposition to moisture the reduced interfacial bond strength contributes to decreasing impact resistance and flexural modulus.
    Notes: An glasfaserverstakten Polycarbonaten wurde der EinfluR einer Klima- und Was-serlagerung auf das Bruchverhalten untersucht. Dabei wurde nachgewiesen, daf3 sich durch eine Vielkanalanalyse der wahrend eines langsamen Biegeversuchs registrierten Schallemission die Festigkeit der Verbundhaftung zwischen Glasfasern und Polycar-bonatmatrix charakterisieren 1Mt. Die Interpretation stiitzt sich auf einen Vergleich der gemessenen Schallemission mit dem Verlauf der Kraft-Verformungs-Kurven und rasterelektronenmikroskopischen Aufnahmen sowie auf den EinfluB einer Glasfaser-beschlichtung auf die experimentellen Befunde.Aus der Abhangigkeit der Schallemissionswerte und der LOsungsviskositat von der Dauer der Klima- bzw. Wasserlagerung folgt, daR der anfangliche Abfall der Schlag-zahigkeit a,, ubenviegend durch eine Versprodung der Polycarbonatmatrix verursacht wird. Bei langer anhaltender Feuchteeinwirkung tragt dann auch die Lockerung der Verbundhaftung zur Abnahme der Schlagzahigkeit und der Biegefestigkeit bei.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/apmc.1982.051080107
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  • 9
    Electronic Resource
    Electronic Resource
    Thermoelektrische analyse (TEA), eine neue Methode zum gleichzeitigen Studium elektrischer und thermischer Eigenschaften von Polymeren (1980)
    Weinheim : Wiley-Blackwell
    Angewandte Makromolekulare Chemie 86 (1980), S. 215-224 
    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: A new method for the simultaneous study of electrical and thermal properties of polymers is proposed. The thermal electrical analysis (TEA) combines the existing techniques of DSC (or DTA) with the electrical method of thermally stimulated discharge (TSD). TEA measurements were carried out with copolymers of methyl methacrylate (PMMA). The molecular origin of the TSD-current at the lower temperature side of the α1-relaxation process (glass transition Tg of the PMMA) is related to the disorientation of small polar segments of the comonomer (α2-relaxation) in the main chain of the PMMA. It can be shown that the TSD-current of the α2-relaxation (T 〉 80°C) increases with increasing comonomer content. This supports the molecular interpretation of the α2-process which is not reflected in the DSC. At higher temperatures frozen in dipoles regain their mobility and show a TSD peak at that temperature which corresponds to the Tg of the PMMA. The TSD ρ-peak at T〉Tg can be attributed to trapped space charges which regain their freedom of motion. The results demonstrate the high resolution and resolving power of the TEA-method. TEA is recommended as an analyzing tool to investigate the relationship between the depolarization of dipoles, carrier transport, trapping of real charges and thermal transitions of polymers.
    Notes: Es wird eine neue Untersuchungsmethode für die gleichzeitige Beobachtung elektrischer und thermischer Eigenschaften von Polymeren dargestellt. Die thermoelektrische Analyse (TEA) verknüpft die bestehenden Techniken der DSC (oder DTA) mit der elektrischen Methode der thermisch stimulierten Entladung (TSD). TEA-Untersuchungen wurden an Copolymeren von Methylmethacrylat (PMMA) oberhalb von Raumtemperatur durchgeführt. Während im DSC-Signal unterhalb der Glastemperatur Tg des PMMA keine Veränderung zu beobachten ist, erkennt man im TSD-Strom bei etwa 80°C das Aufterten einer Schulter (α2-Relaxationsprozeß) auf der Tieftemperaturseite des α1-Maximums (Tg). Da der TSD-Strom linear mit dem Comonomergehalt im Bereich des α2 Relaxationsprozesses ansteigt, wird dieser der Desorientierung von kleinen, polaren Segmenten des Comonomeren in der Hauptkette des PMMA zugeschrieben. Das TSD ρ-Maximum bei T〉Tg kann auf in Haftstellen eingefangene Ladungsträger zurückgeführt werden. Die Ergebnisse lassen erkennen, daß die TEA-Technik eine hohe Empfindlichkeit und Auflösung besitzt und durch ihre gleichzeitige Zuordnung thermischer und elektrischer Größen zu einer Vertiefung der Kenntnisse des elektrischen Leitungsmechanismus und zum Erkennen und Deuten von Relaxationserscheinungen in Hochpolymeren beiträgt.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/apmc.1980.050860116
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  • 10
    Electronic Resource
    Electronic Resource
    Entwicklungsstand und Entwicklungsrichtungen von Flow-Sheeting-ComputerprogrammenVortrag von Kl.-K. Neumann auf dem Jahrestreffen der Verfahrens-Ingenieure, 28. bis 30. Sept. 1983 in Nürnberg. (1983)
    Weinheim : Wiley-Blackwell
    Chemie Ingenieur Technik - CIT 55 (1983), S. 980-981 
    Details
    ISSN: 0009-286X
    Keywords: Computer ; Flow-Sheeting-Programme ; Anlagenplanung ; Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cite.330551223
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