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
  • 1
    Electronic Resource
    Electronic Resource
    Crosslinked polystyrene with improved mechanical properties (1993)
    Bognor Regis [u.a.] : Wiley-Blackwell
    Journal of Polymer Science Part A: Polymer Chemistry 31 (1993), S. 2305-2311 
    Details
    ISSN: 0887-624X
    Keywords: polystyrene ; bis(vinylphenyl)ethane ; bis(vinylbenzyloxi)alkanes ; mechanical strength ; Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The synthesis of some divinyl monomers - bis(vinylphenyl)ethane (2), bis(vinylbenzyloxy)hexane (3a), and bis(vinylbenzyloxy)dodecane (3b) is reported. Copolymers of the new monomers and styrene were evaluated as an alternative to divinylbenzene-crosslinked polymers for use as matrices and absorbents. The mechanical properties and the amount of residual double bonds in the copolymers were compared. It was found that the new copolymers, unlike the divinylbenzene-crosslinked polymers, retained their mechanical strength even at high crosslinking degrees. Stress at break values of 79, 68, and 18 N/mm2 were found for the polymers crosslinked with 20 mol % of 3a, 2, and divinylbenzene; 5, 25 and 45% of the divinyl units in these polymers were left as pendant double bonds. Porous styrene-2 copolymers were synthesized and shown to have lower surface areas than the corresponding divinylbenzene-crosslinked polymers. The pore size distribution showed that this was due to the absence of the smallest pores which are found in the divinylbenzene-crosslinked polymers in between heavily crosslinked nodules. © 1993 John Wiley & Sons, Inc.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pola.1993.080310913
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 2
    Electronic Resource
    Electronic Resource
    Electrically conductive composite prepared by template polymerization of pyrrole into a complexed polymer (1994)
    Bognor Regis [u.a.] : Wiley-Blackwell
    Journal of Polymer Science Part A: Polymer Chemistry 32 (1994), S. 495-502 
    Details
    ISSN: 0887-624X
    Keywords: polypyrrole ; polymer composites ; template polymerization ; Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Electrically conducting polymer composite films have been synthesized by the exposure of poly(4-vinylpyridine) complexed with cupric ions to pyrrole and water vapor. To immobilize a stoichiometric amount of the oxidant inside the polymer matrix, the ratio of poly(4-vinylpyridine)/cupric ion = 1.8 was chosen. Polypyrrole was formed in this tailored structure by a template polymerization process. Opaque polymer composite films with electrical conductivity up to 60 (Ω cm)-1 have been obtained by this method, However, slightly colored transparent composite thin films with a conductivity as high as 50 (Ω cm)-1 were also produced. The electrically conducting polymer composite films and the metal-polymer complex have been characterized by XPS and IR spectroscopy, elemental analysis, EDX, and scanning electron microscopy. The polymerization process was also followed by use of a quartz crystal microbalance. © 1994 John Wiley & Sons, Inc.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pola.1994.080320311
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 3
    Electronic Resource
    Electronic Resource
    Diffusion of ethylene glycol accompanied by reactions in poly(ethylene terephthalate) melts (1992)
    Bognor Regis [u.a.] : Wiley-Blackwell
    Journal of Polymer Science Part B: Polymer Physics 30 (1992), S. 707-716 
    Details
    ISSN: 0887-6266
    Keywords: poly(ethylene terphthalate), diffusion of ethylene glycol in melts of ; diffusion coefficient of ethylene glycol in PET melts ; diffusion with chemical reaction of ethyleneglycol in PET melts ; Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Diffusion coefficients of ethylene glycol (EG) have been measured in poly(ethylene terephthlate) (PET) melts by a quartz-spring sorption apparatus. A simple mathematical model was developed to investigate the sorption behavior accompanied by chemical reactions of EG and PET at high temperatures. Diffusion coefficients are deduced from experimental data for an asymptotically thin sample in order to minimize the effects of reactions. The diffusion coefficient of EG is strongly dependent on the vapor pressure of EG and temperature but not on the molecular weight of PET in this experimental range (degree of polymerization 80-120). The diffusion coefficient of EG in PET melt at 265°C is 2.58 × 10-7 cm2/s at the limit of zero concentration of EG. The activation energy for diffusion is 38.4 kcal/gmol, and the heat of solution for sorption is -44.9 kcal/gmol. The concentrations of the volatile materials resulting from reactions in PET-EG system were analyzed with gas chromatography. In addition, a fit of the current model to experimental data yields frequency factors for the polymerization reaction (k1) and the acetaldehyde formation reaction (k2) to be 5.84 × 108 cm3/mol ċ min and 3.90 × 1011 min-1, respectively.
    Additional Material: 18 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/polb.1992.090300708
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 4
    Electronic Resource
    Electronic Resource
    The MOCVD challenge, Vol. I. By M. Razeghi. Adam Hilger, Bristol 1989. xii, 328 pp., bound, £ 55.00. - ISBN 0-85274-161-8 (1990)
    Weinheim : Wiley-Blackwell
    Advanced Materials 2 (1990), S. 442-442 
    Details
    ISSN: 0935-9648
    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
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/adma.19900020922
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 5
    Electronic Resource
    Electronic Resource
    Synthesis of Gallane-Amine adducts as potential precursors for GaAs and (AlGa)as MOVPE processes and the crystal structure of the {gallane · 1,3-bis(dimethylamino)propane} adduct H3Ga · N(CH3)2(CH2)3N(CH3)2 (1992)
    Weinheim : Wiley-Blackwell
    Advanced Materials 4 (1992), S. 576-579 
    Details
    ISSN: 0935-9648
    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
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/adma.19920040911
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 6
    Electronic Resource
    Electronic Resource
    Korrosion von Stahl vom Typ 03Cr18Ni13Mo2,5 und 02Cr25Ni22Mo2N bei der Harnstoffsynthese (1990)
    Weinheim [u.a.] : Wiley-Blackwell
    Materials and Corrosion/Werkstoffe und Korrosion 41 (1990), S. 124-129 
    Details
    ISSN: 0947-5117
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Description / Table of Contents: Corrosion of steels type 03Cr18Ni13Mo2.5 and 02Cr25Ni22Mo2N in urea processing environmentLong-term corrosion tests with the steel types 03Cr18Ni3Mo2.5 having different chemical compositions and chemical purity, and 02Cr25Ni22Mo2N have been carried out for up to 112517 and 64 699 h, respectively, in the urea manufacture environment. According to the results the first steel is a suitable material of construction for the high pressure parts of urea plant, provided its chromium content is higher than 18%. This quality meets requirements of urea grade steels.The steel 02Cr25Ni22Mo2N is even more corrosion resistant, but its use may be critical because of the high nickel content.A mathematical model has been developed for the weight loss-time-dependence and the results have been extrapolated to up to 1.5 ·105h.
    Notes: Langfristige Korrosionsprüfungen (bis 112 517 h) mit Stählen des Typs 03Cr18Ni13Mo2,5 mit unterschiedlicher chemischer Zusammensetzung und metallurgischer Reinheit und (bis 64 699 h) mit Stählen des Typs 02Cr25Ni22Mo2N unter den Betriebsbedingungen bei der Harnstoffsynthese werden beschrieben. Der erstgenannte Stahltyp mit Chromgehalten über 18% ist geeignet für den Hochdruckteil der Harnstoffsyntheseanlage und erfüllt auch die sonstigen Anforderungen an Stähle von Harnstoffqualität.Der Stahltyp 02Cr25Ni22Mo2N ist noch korrosionsbeständiger und daher ebenfalls bei der Harnstoffsynthese gut verwendbar, allerdings wegen des hohen Nickelgehalts nicht so wirtschaftlich.Die Gewichtsabnahme-Zeit-Kurven wurden bis auf 1,5 ·105h extrapoliert.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/maco.19900410305
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 7
    Electronic Resource
    Electronic Resource
    Korrosionseigenschaften dünner Schichten im System Ti—B—N (1992)
    Weinheim [u.a.] : Wiley-Blackwell
    Materials and Corrosion/Werkstoffe und Korrosion 43 (1992), S. 511-519 
    Details
    ISSN: 0947-5117
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Description / Table of Contents: Corrosion properties of thin coatings in the Ti—B—N systemThin titanium nitride TiN, boride TiB2 and boronitride Ti(B, N) hard coatings were deposited on titanium substrates by the PVD-process Magnetron-Sputter-Ion-Plating (MSIP). They were characterized by X-ray diffractometry, SEM and WDX-analysis. With increasing B-content the Vickers hardness of the coatings increases. Photoelectron spectroscopic measurements show that all coatings are covered in atmosphere by thin oxid layer.Titanium nitride is electrochemically in 1 N sulphuric acid stable up to 1.3 V (SHE), above 1.3 V it becomes oxidized to titanium oxide TiO2 and nitrogen N2. The oxidation products were detected with XPS. Corrosion tests in nitric acid HNO3 show that the corrosion resistance of titanium nitride is lower than the resistance of titanium. The corrosion of titanium boride and titanium boronitride in sulphuric acid is more intensive compared to titanium nitride. The borides cannot be passivated, but dissolve completely by anodic polarization.
    Notes: Dünne metallische Hartstoffschichten aus TiN, TiBN, TiB2 wurden durch die PVD-Technik des reaktiven Hochleistungskathodenzerstäubens auf Titangrundwerkstoff abgeschieden und durch Röntgenstrukturanalyse und Elektronenrasteraufnahmen charakterisiert. Die Härte der Schichten wächst mit zunehmendem Borgehalt. Photoelektronenspektroskopische Untersuchungen belegen, daß alle Schichten an Luft mit einer dünnen Oxidschicht bedeckt sind. Elektrochemisch ist TiN in 1 N H2SO4 bis 1,3 V (SHE) stabil, oberhalb 1,3 Verfolgt Oxidation zu TiO2 und N2. Die Oxidationsprodukte lassen sich mit XPS nachweisen. Korrosionstests in HNO3 zeigen, daß die Korrosionsstabilität von TiN deutlich geringer als von Ti ist. Die Korrosion von TiBN und TiB2 ist bei der Oxidation von H2SO4 wesentlich größer als bei TiN. TiB2 läßt sich nicht passivieren, sondern löst sich anodisch vollständig auf.
    Additional Material: 16 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/maco.19920431102
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 8
    Electronic Resource
    Electronic Resource
    Mikrobielle Werkstoffzerstörung - Schadensfälle und Gegenmaßnahmen: Umweltrechtliche Belange (1994)
    Weinheim [u.a.] : Wiley-Blackwell
    Materials and Corrosion/Werkstoffe und Korrosion 45 (1994), S. 203-205 
    Details
    ISSN: 0947-5117
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Description / Table of Contents: Microbial deterioration of materials - case histories and countermeasures: Legal aspects of environmental protectionBiofouling is a natural process. Usually, it does not cause too much harm if taken care of properly. If biofouling is fought by special means, problems may arise. The waste water does not meet the due standards. Sometimes the recipe of the treatment agent is not known. If the treatment causes more problems than it can solve help is needed quickly. Yet, it is advisable to keep one's mind clear. Wrong help can become very expensive. In addition, legal punishment will follow, if environmental legislation is hurt. Damages of the environment will be payed by an insurance company only, if the risk is covered by the insurance contract in advance.The best way to be sure is to have a good lawyer, a good expert in environmental techniques and environmental legislation, a good insurance, and to anticipate possible risks.
    Notes: Biofouling ist etwas Alltägliches. Normalerweise verursacht es keine unvorhersehbaren Probleme, wenn man stets ein Auge darauf hat. Wenn Biofouling aber mit Spezialmitteln bekämpft wird, können plötzlich Probleme auftauchen. Das Abwasser hält nicht mehr die im Bescheid geforderten Werte ein. Manchmal ist die Zusammensetzung des Behandlungsmittels nicht bekannt. Wenn die Behandlung mehr Probleme aufwirft, als sie löst, ist rasche Hilfe gefragt. Trotzdem heißt es, einen klaren Kopf zu behalten. Falsche Hilfe kann teuer werden. Zusätzlich drohen Bußgelder und Strafen bei Verstößen gegen die Umweltschutzbestimmungen. Umweltschäden werden von der Versicherung nur getragen, wenn das Risiko im Vertrag auch abgedeckt ist. Um sicher zu gehen, braucht man einen guten Rechtsanwalt, einen guten Fachmann für Umweltschutztechniken und Umweltschutzrechtsfragen in einer Person, eine gute Versicherung und eine weise Vorsicht.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/maco.19940450316
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 9
    Electronic Resource
    Electronic Resource
    Corrosion behaviour of Ni3Al alloys in SO2-containing combustion gases (1990)
    Weinheim [u.a.] : Wiley-Blackwell
    Materials and Corrosion/Werkstoffe und Korrosion 41 (1990), S. 692-700 
    Details
    ISSN: 0947-5117
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Description / Table of Contents: Korrosionsverhalten von Ni3Al-Legierungen in Schwefeldioxid enthaltenden VerbrennungsgasenDas Verhalten von einigen mit Zirkonium oder Hafnium legierten Nickelaluminiden unter den Bedingungen der Hochtemperaturkorrosion wird anhand der Ergebnisse behandelt, die bei Temperaturen zwischen 920 und 1010°C in Luft und in Schwefeldioxide enthaltenden Atmosphären mit Hilfe einer Thermowaage erhalten wurden. Die in Luft erhaltenen Ergebnisse zeigen, daß alle Nickelaluminide bis 920°C gut korrosionsbeständig sind. Dabei ist mit Hafnium legiertes Nickelaluminid beständiger als das mit Zirkonium legierte. Die in Luft entstandene Oxidschicht ist immer sehr dünn und sehr wenig porös und besteht vorwiegend aus Aluminiumoxid. In Schwefeldioxid enthaltenden Atmosphären werden diese Legierungen, wenn sie nicht voroxidiert wurden, stark angegriffen. Die Voroxidation in Wasserdampf und Wasserstoff enthaltenden Gasgemischen verbessert die Korrosionsbeständigkeit der Legierungen beträchtlich. Dabei wird das Nickelaluminid selektiv oxidiert, und es entsteht eine hauptsächlich aus Aluminiumoxid bestehende schützende Schicht, welche den Grundwerkstoff auch in Schwefeldioxid enthaltenden Atmosphären schützt.
    Notes: The high temperature corrosion behaviour of some nickel aluminides alloyed with zirconium or hafnium is presented. The corrosion tests were carried out in the temperature range 920 to 1010°C, both in air and in atmospheres containing sulphur dioxide, using a thermobalance. The results obtained in air show that all the nickel aluminides display sufficient corrosion resistance up to 920°C. Nickel aluminide alloyed with hafnium is more resistant than the aluminide alloyed with zirconium. The oxide layer on the specimens tested in air is always very thin, exhibits low porosity and consists mainly of Al2O3. Without controlled preoxidation these materials are rather susceptible to corrosion in atmospheres containing sulphur dioxide. The preoxidation in gas mixture containing water vapor and hydrogen markedly improves the corrosion resistance of these alloys. The corrosion implies the selective oxidation of nickel aluminides. The protective layer consists mainly of aluminium oxide and protects the base material also in atmospheres containing sulphur dioxide.
    Additional Material: 19 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/maco.19900411209
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 10
    Electronic Resource
    Electronic Resource
    Breakdown of cadmium passivity in alkaline solution (1992)
    Weinheim [u.a.] : Wiley-Blackwell
    Materials and Corrosion/Werkstoffe und Korrosion 43 (1992), S. 63-68 
    Details
    ISSN: 0947-5117
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Description / Table of Contents: Zerstörung der Passivität von Cadmium in alkalischer LösungDas elektrochemische Verhalten einer Cd-Anode wurde in 0,05 bis 2 M NaOH potentiodynamisch untersucht. Die Polarisationskurven zeigen vor der Sauerstoffentwicklung Aktiv-Passiv-Übergang. Das Schwellenpotential der aktiven Auflösung liegt sehr nahe am reversiblen Potential des Systems Cd/Cd(OH)2. Röntgenbeugung und XPS-Analyse zeigen, daß die Passivschicht aus sowohl CdO als auch Cd(OH)2 besteht. Der Einfluß steigender Mengen von Chlor-, Brom- und Jodionen auf das anodische Verhalten von Cd in NaOH wurde untersucht. Die Halidionen stimulieren danach die anodische Auflösung im aktiven Bereich und durchbrechen die Passivschicht im passiven Bereich, so daß Lochkorrosion auftritt. Das Lochkorrosionspotential verschiebt sich mit zunehmender Halidionekonzentration nach negativeren. mit zunehmender Alkalikonzentration jedoch nach positiveren Werten.
    Notes: The electrochemical behaviour of a Cd anode was investigated in 0.05-2 M NaOH solutions by the potentiodynamic technique. The polarization curves exhibit active to passive transition prior to oxygen evolution. The threshold potential of the active dissolution is very close to the reversible potential of the system Cd/Cd(OH)2. X-Ray diffraction and XPS measurements reveal that the passive layer is composed of both Cd(OH)2 and CdO. The influence of increasing amounts of Cl-, Br- or I- ions on the anodic behaviour of Cd in NaOH solution has been investigated. The halides stimulate the anodic dissolution in the active region and tend to break-down the passive layer in the passive region, leading to pitting attack. The pitting potential shifts to more negative values with increasing halide ion concentration but to the reverse direction with increasing alkali concentration.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/maco.19920430205
    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...