ALBERT

All Library Books, journals and Electronic Records Telegrafenberg

X
feed icon rss

Your email was sent successfully. Check your inbox.

An error occurred while sending the email. Please try again.

Proceed reservation?

Export
Filter
  • Polymer and Materials Science  (1,714)
  • 2005-2009
  • 1980-1984  (1,192)
  • 1965-1969  (522)
Collection
Keywords
Publisher
Years
Year
  • 1
    Electronic Resource
    Electronic Resource
    Thermally stimulated depolarization studies of cellulose nitrate (1983)
    Weinheim : Wiley-Blackwell
    Acta Polymerica 34 (1983), S. 16-18 
    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: Die thermisch stimulierte Depolarisation von Cellulosenitrat wurde in Abhängigkeit von der Polarisierungsspannung, der Polarisierungstemperatur, der Aufheizgeschwindigkeit und der Lagerzeit gemessen. Ein Maximum, das auf die polare Estergruppe zurückzuführen ist und dessen Höhe mit der Polarisierungsspannung zunimmt, wird bei etwa 50°C beobachtet. Das Maximum tritt bei niedrigen (≤90°C) und hohen (≥140°C) Polarisierungstemperaturen nicht auf. Im dazwischen liegenden Temperaturbereich nimmt der maximale Strom von 100 bis 120°C ab und steigt danach wieder an. Höhe und Temperaturlage des Maximums nehmen mit der steigenden Aufheizgeschwindigkeit zu und mit der Lagerzeit ab.
    Notes: Thermally stimulated depolarization of cellulose nitrate has been measured as a function of polarizing voltage, electret forming temperature, heating rate and storage time. A single peak due to polar side ester group is observed at approximately 50°C, whose magnitude increases with polarizing voltage. The peak is absent for low (≤90°C) and high (≥140°C) electret forming temperatures. In the intermediate temperature range the value of the peak current decreases with the forming temperature from 100 to 120°C and then increases. The magnitude of the peak current and the peak temperature increase with heating rate and decrease with storage time.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/actp.1983.010340104
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 2
    Electronic Resource
    Electronic Resource
    On the partial mercerization and crimp development in jute fiber (1983)
    New York : Wiley-Blackwell
    Journal of Polymer Science: Polymer Letters Edition 21 (1983), S. 263-270 
    Details
    ISSN: 0360-6384
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1983.130210406
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 3
    Electronic Resource
    Electronic Resource
    Graft copolymerization of poly(vinyl chloride) with styrene. II. Thermal behavior (1980)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 25 (1980), S. 1087-1094 
    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: Thermal behavior of graft copolymers of polyvinyl chloride with polystyrene prepared by using a cationic initiator (AlCl3) was evaluated by measurement of rates of dehydrochlorination in nitrogen atmosphere. With increase in the extent of grafting the rates were found to decrease. Dynamic thermogravimetric analysis revealed an overall improvement in thermal stability of copolymers. Development of polyene sequences in degraded polymer samples was evaluated by measurement of electronic absorption spectra. In comparison to PVC, graft copolymer samples had fewer conjugated double bonds.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1980.070250611
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 4
    Electronic Resource
    Electronic Resource
    Structure-property relations of carboxylated nitrile rubber (1981)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 26 (1981), S. 4011-4020 
    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 technical properties and the network structure of carboxylated nitrile rubber (XNBR) having a mixed crosslink system of sulfur and metal carboxylate have been studied. XNBR of different carboxyl contents (Krynac 221, Krynac 110C), yielding different concentrations of ionic crosslinks, have been used for this purpose. The amount of ionic crosslinks was also varied by varying the amount of crosslinking agent (zinc peroxide). It has been observed that ionic crosslinks impart high tensile strength, permanent set, and hardness, while sulfur crosslinks introduce high flex crack resistance, elongation at break, and tear strength in the vulcanizate. Heat buildup and resilience could be explained with the help of stress relaxation experiments. Stress decay is more when the amount of ionic crosslinks is higher. Higher stress relaxation gives higher hysteresis. The kinetics of the crosslinking of a mixed crosslink system has also been studied. At overcure times the amount of ionic crosslinks is greater than that of sulfur crosslinks which desulfurizes in this region. The technical properties could be explained on this basis.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1981.070261204
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 5
    Electronic Resource
    Electronic Resource
    Simulation of three-stage nylon 6 reactors with intermediate mass transfer at finite rates (1982)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 27 (1982), S. 3089-3101 
    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: A three-stage isothermal nylon 6 reactor with a kinetic scheme incorporating ring opening, polycondensation, polyaddition, cyclic dimer formation, and reaction with monofunctional acids has been modeled. In the first and third stages, removal of the condensation by-product, water, is prevented. The second stage of this sequence, however, involves finite rates of diffusion of water to cocurrently flowing inert gas bubbles. the number-average chain length of the polymer obtained in this reactor differs substantially from that obtained assuming instantaneous water removal and is a function of the various design variables. It is observed that several choices of these design variables can be made to obtain the same product, thus emphasizing the need for more comprehensive optimization studies than hitherto carried out.
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1982.070270831
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 6
    Electronic Resource
    Electronic Resource
    Analysis of wiped film reactors using the orthogonal collocation technique (1984)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 29 (1984), S. 3217-3230 
    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: Transport equation for ARB polymerization in wiped film reactors have been written. These have been reduced to the moment generation equations and using a suitable moment closure approximation, the zeroth and the second moments of the polymer have been numerically solved using the finite difference as well as the orthogonal collocation techniques. In the numerical solution by the finite difference technique, it is necessary to divide the dimensionless film thickness into at least 250 grid points to obtain stable results. The use of nine collocation points by the orthogonal collocation technique gives results close to those by the finite difference method and leads to considerable computational saving. The transport equations for the bulk and the film are found to involve four dimensionless parameters, and their effect upon the polymer formed at the end of the reactor has been studied.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1984.070291101
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 7
    Electronic Resource
    Electronic Resource
    Electrophoresis of absorbed RNA (1968)
    New York : Wiley-Blackwell
    Biopolymers 6 (1968), S. 97-104 
    Details
    ISSN: 0006-3525
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The electrophoretic mobilities of adsorbed yeast ribonucleic acid have been measured as functions of pH, ionic strength, and biopolymer concentration and the results so obtained have been critically compared with those for adsorbed DNA. Like DNA, ribonucleic acid has also been found to reverse the positive charge of alumina owing to its adsorption on the solid-liquid interface. The mobilities of adsorbed RNA have been found to be less than those of adsorbed DNA under identical conditions. The observed mobilities of adsorbed heat- and alkali-denatured RNA are significantly less than those of adsorbed native RNA at a given pH and ionic strength of the medium. The electrophoretic mobilities as observed also show the evidence of RNA adsorption on the negatively charged surface of Dowex-50 resin, but practically no adsorption of RNA on the negatively charged glass surface has been predicted.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bip.1968.360060108
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 8
    Electronic Resource
    Electronic Resource
    Polypyromellitimides. Thermally stable materials (1980)
    Weinheim : Wiley-Blackwell
    Angewandte Makromolekulare Chemie 87 (1980), S. 49-62 
    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: Es wurde der Einfluß der Kettenbeweglichkeit auf das thermische Verhalten der Polyimide untersucht. Die Copolyimide wurden aus Pyromellithdianhydrid (PMDA), Benzidin (B), p-Phenylendiamin (P) und p,p′-Diaminodiphenylmethan (D), hergestellt. Lösliche Polyamidsäure wurde durch Ausführen der Reaktion in Dimethylformamid (DMF) bei 0°C erhalten. Die cyclische Dehydrierung von Amidsäuren zu Polyimiden wurde auf chemischem Wege ausgeführt (Acetanhydrid: Pyridin). Es wurden verschiedene Copolyimide durch Veränderung des Ausgangsmonomerenverhältnisses hergestellt.Die Copolyimide wurden durch Bestimmen des Staudinger-Index der Polyamidsäure in DMF bei 30°C charakterisiert. Die Anwesenheit von Amidsäure- und Imidstrukturen im Rückgrat wurde durch IR-Spektren bestätigt. Mit Hilfe der dynamischen Thermogravimetrie wurde das thermische Verhalten der Polymeren in Luft und Stickstoff beurteilt; außerdem sind die insgesamt ermittelte Zersetzungstemperatur und die Aktivierungsenergie des thermischen Abbaus gemessen worden.
    Notes: The effect of backbone flexibility on the thermal behaviour of the polyimides was investigated by synthesizing copolyimides based on pyromellitic dianhydride (PMDA) and benzidine (B), p-phenylene diamine (P), and p,p′-diamino diphenyl methane (D). Soluble polyamic acids were obtained by carrying the reaction in dimethyl formamide (DMF) at 0°C. The cyclodehydration of amic acid to polyimides was carried out by chemical means (acetic anhydride : pyridine). Several copolyimides were prepared by changing the molar ratios of diamines in initial monomer feed. These were characterized by evaluation of intrinsic viscosity of polyamic acid in DMF at 30°C. The presence of amic acid and imide structures in the backbone was confirmed by IR spectra. Thermal behaviour of the polymers in air and nitrogen atmosphere was evaluated by dynamic thermogravimetry. The integral procedural decomposition temperature and activation energy of thermal degradation has been evaluated.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/apmc.1980.050870103
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 9
    Electronic Resource
    Electronic Resource
    Effect of heat treatment on the dielectric relaxation of polyacrylonitrile. II. Heat treatment under vacuum and in air (1982)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 27 (1982), S. 4101-4114 
    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: Dielectric relaxation, infrared spectra, and X-ray diffraction data of polyacrylonitrile (PAN) heat treated at 120°C in air and under vacuum and of the untreated PAN are reported. The heat treatment resulted in (1) lowering of dielectric constant increment, dielectric dissipation factor, and increase in relaxation temperature and glass transition temperature; (2) lowering of the intensity of —C≡N stretching band in the infrared spectra; and (3) increase in degree of order of the X-ray diffraction results. The changes produced by heat treatment under vacuum are found greater than those produced by heat treatment in air, which suggests that the observed effect is not caused by chemical changes in the PAN molecule under heat treatment. Interpretation of these results is attempted on the basis of the difference in the degree of bound nitrille group pairs (bound through intermolecular dipole-dipole interactions) in the structure of PAN heat treated under the different conditions.
    Additional Material: 9 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1982.070271103
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 10
    Electronic Resource
    Electronic Resource
    Studies on moisture sorption in coir fibers (cocos nucifera L) (1983)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 28 (1983), S. 625-632 
    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: Moisture desorption characteristics in coir fibers have been studied at several temperatures (53°C, 68°C, 86°C, and 105°C) as a function of time. Moisture absorption at room temperature after heating to 53°C, 68°C, 86°C, and 105°C are also reported. The results indicate that the relation between percentage moisture loss (A) (moisture loss is the ratio of the difference between initial moisture and final moisture to initial moisture) and temperature (T°K) is of the type A = Aoe-B/T in the range of intervals studied. The constants Ao and B are dependent on time, and they decrease with time. The fraction moisture loss/gain (w) is related to time (t) by the equation w = m/t + b0 at all temperatures investigated. The constant m decreases with temperature while b0 increases with temperature. The equilibrium moisture content (the condition reached by the sample when it no longer takes up moisture from or gives up moisture to the surrounding atmosphere) increases with increase in relative pressure and decrease in temperatures. As the moisture content in the fiber increases, the tensile strength (tenacity) decreases and the % elongation increases. The observed results are explained on the basis of structural rearrangement on heating/cooling of lignocellulosic material.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1983.070280218
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
Close ⊗
This website uses cookies and the analysis tool Matomo. More information can be found here...