Library

X
Language
Preferred search index
Number of Hits per Page
Default Sort Criterion
Default Sort Ordering
Size of Search History
Default Email Address
Default Export Format
Default Export Encoding
Facet list arrangement
Maximum number of values per filter
Auto Completion
Feed Format
Maximum Number of Items per Feed
Permalink If you want to be able to use settings permanently, you must save your settings and then set a Bookmark to the permalink
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
    Compositional control of PbTiO3 thin films by plasma enhanced metalorganic chemical vapor deposition (1993)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 63 (1993), S. 2511-2513 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: PbTiO3 thin films on the Si substrates were prepared by plasma enhanced chemical vapor deposition (PECVD) using Ti(O-i-C3H7)4, Pb(C2H5)4, and oxygen. The composition of PECVD PbTiO3 thin films was intensively influenced by the input flow rate ratio of precursors while it was independent of the deposition temperatures. As-deposited PECVD PbTiO3 thin film showed a uniform distribution of the Pb, Ti, and C component throughout the bulk of film. When an annealing process was performed at 750 °C under the O2 ambient for 1 h, the Pb/(Pb+Ti) ratio of thin films was reduced from 0.567 to 0.509.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.110465
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 2
    Electronic Resource
    Electronic Resource
    Residual Oil Hydrodesulfurization Using Dispersed Catalysts in a Carbon-Packed Trickle Bed Flow Reactor (1995)
    s.l. : American Chemical Society
    Energy & fuels 9 (1995), S. 2-9 
    Details
    ISSN: 1520-5029
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Energy, Environment Protection, Nuclear Power Engineering , Process Engineering, Biotechnology, Nutrition Technology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ef00049a001
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 3
    Electronic Resource
    Electronic Resource
    Ethylene and Propylene Polymerization over Chiral ansa-Dichloro[o-phenylenedimethylenebis(.eta.5-1-indenyl)]zirconium [Zr{C6H4(CH2-1-C9H6)2-1,2}Cl2] (1995)
    s.l. : American Chemical Society
    Macromolecules 28 (1995), S. 4801-4805 
    Details
    ISSN: 1520-5835
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ma00118a003
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 4
    Electronic Resource
    Electronic Resource
    Compatibilizing capability of poly(β-hydroxybutyrate-,co-ε-caprolactone) in the blend of poly(β-hydroxybutyrate) and poly(ε-caprolactone) (1998)
    Springer
    Polymer bulletin 41 (1998), S. 707-712 
    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: Abstract In order to increase the miscibility in the blend of poly(β-hydroxybutyrate) [PHB] and poly(ε-caprolactone) [PCL], PHB/PCL copolyesters were used as compatibilizers. These PHB/PCL copolyesters were synthesized by transesterification in solution phase. The melting point [Tm] depression, which was not observed in PHB/PCL blend without compatibilizer, was observed when PHB/PCL copolyesters as compatibilizers were added to the PHB/PCL blend system. As the amount of compatibilizer added to the blend increased, the crystallization temperature [Tc] of PCL in the blend increased and Tc of PHB in the blend decreased. The difference in Tc between PHB and PCL was gradually reduced. When the sequence length of PHB block and PCL block in the PHB/PCL copolyester increased, the miscibility of the blend increased. This is evidenced by the depression in the Tm of PHB and PCL in the blend and by the decrease in the difference of Tc between PHB and PCL. From the polarizing optical micrographs, the phase separation in PHB/PCL blend was observed. However, in the presence of PHB/PCL copolyester, the spherulite of PHB grows in equilibrium with one phase melt.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s002890050422
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 5
    Electronic Resource
    Electronic Resource
    Polymerization of propylene by highly active catalysts synthesized with Mg(OEt)2/benzoyl chloride/TiCl4 (1990)
    Springer
    Polymer bulletin 23 (1990), S. 35-42 
    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 Active centers have been studied in the polymerization of propylene using highly active Mg(OEt)2/Benzoyl chloride/TiCl4 catalysts activated with AlEt3. The method for the measurement of active centers is based on the inhibiting effect of CO on polymerization. The activity of the present catalysts, which is higher than that of TiCl3 or MgCl2-supported catalyst, is mainly due to the higher concentration of active centers by one order of magnitude. In order to investigate the stability of active centers during polymerization the number of active centers are compared at various polymerization times.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00983961
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 6
    Electronic Resource
    Electronic Resource
    Homo- and co-polymerization of ethylene with highly active Ti/Mg bimetallic complexes (1989)
    Springer
    Polymer bulletin 22 (1989), S. 239-246 
    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 Homo- and co-polymerization of ethylene were performed by using a catalyst system composed of recrystallized MgCl2 TiCl4 THF complex with AlEt3. The effect of crystallization conditions during the catalyst preparation on the chemical composition and physical structure of catalysts was discussed with the help of element analysis, IR spectroscopy, and X-ray powder diffraction. The variation caused by different crystallization conditions had considerable influences on the rate profiles of homo-and co-polymerization of ethylene.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00282847
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 7
    Electronic Resource
    Electronic Resource
    Propylene polymerization with unbridged rac- or meso-bis[1-(p-toly)indenyl]dichloro zirconium/methylaluminoxane catalyst (1996)
    Springer
    Polymer bulletin 37 (1996), S. 35-41 
    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 A novel unbridged metallocene complex, (1-tol Ind) 2ZrCl2 (Tol=p-C6H4CH3) was prepared. Meso-like (1-Tol Ind) 2ZrCl2 afforded a syndiotactic-dominant polypropylene having a short syndiotactic length at low temperatures (-30°C). This stereosequence is due either to a weakly chain-end controlled or to a syndiotactic site controlled polymerization with site isomerization. Racemic isomer produced a completely atactic pp even at-30°C.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00313816
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 8
    Electronic Resource
    Electronic Resource
    Synthesis of copolyesters containing poly(ethylene terephthalate) and poly(ε-caprolactone) units and their susceptibility toPseudomonas sp. lipase (1994)
    Springer
    Journal of polymers and the environment 2 (1994), S. 9-18 
    Details
    ISSN: 1572-8900
    Keywords: Poly(ethylene terephthalate) ; poly(ε-caprolactone) ; copolyester ; enzymatic degradation ; Pseudomonas sp. lipase
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Energy, Environment Protection, Nuclear Power Engineering , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract Copolyesters containing poly(ethylene terephthalate) (PET) and poly(ε-caprolactone) (PCL) were synthesized from PET and PCL homopolymers by transesterification reaction at 270°C in the presence of catalyst. The copolyesters were characterized by13C-NMR and differential scanning calorimetry (DSC). The degradation behavior of PCL byPseudomonas sp. lipase in buffer solution (pH 7) and tetrahydrofuran (THF) was investigated by gel permeation chromatography (GPC) and1H-NMR. From these experiments, it was found thatPseudomonas sp. lipase acted endoenzymatically on PCL. Using this lipase, degradation tests for PET/PCL copolyesters whose PCL content was below 50% by weight were also performed in buffer solution (pH 7). However, evenPseudomonas sp. lipase with high degradation activity on PCL did not easily degrade the PCL unit in PET/PCL copolyesters.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02073482
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 9
    Electronic Resource
    Electronic Resource
    Selective alkylation of aniline with methanol over metallosilicates (1994)
    Springer
    Catalysis letters 26 (1994), S. 169-180 
    Details
    ISSN: 1572-879X
    Keywords: aniline alkylation ; metallosilicate ; acidity ; NNDMA selectivity
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract The selective alkylation of aniline with methanol was investigated over various metallosilicates synthesized in two different media: alkaline medium (NaOH) and fluorine medium (NH4F). Through the elemental analysis, XRD, and29Si MAS NMR, it was thought that all the metallosilicates had MFI zeolite structure and the metals were incorporated in metallosilicate framework successfully. Temperature programmed desorption (TPD) of NH3 and aniline alkylation suggested that the selectivity for N,N-dimethylaniline (NNDMA) is high when the metallosilicates have a large number of medium acid sites (567–673 K), which means that the medium acid sites play an important role in the production of NNDMA. It was also known that metallosilicates synthesized in fluorine medium have strong acid sites (〉 773 K) and were deactivated more rapidly than those synthesized in alkaline medium.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00824042
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 10
    Electronic Resource
    Electronic Resource
    The role of lanthanum oxide on Pd‐only three‐way catalysts prepared by co‐impregnation and sequential impregnation methods (2000)
    Springer
    Catalysis letters 70 (2000), S. 35-41 
    Details
    ISSN: 1572-879X
    Keywords: Pd‐only three‐way catalyst ; lanthanum oxide ; cerium oxide ; co‐impregnation ; XPS ; XRD ; thermal aging
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract The effect of lanthanum oxides on the catalytic performance and the physicochemical properties of Pd‐only three‐way catalysts prepared by co‐impregnation and sequential impregnation methods was studied by using hydrogen chemisorption, BET surface area, X‐ray diffraction and X‐ray photoelectron spectroscopy. It was found that the roles of La closely depended on the order of La introduction in the preparation of the Pd catalysts. Pd–La/Al2O3 prepared by co‐impregnation of La and Pd, kept its superior activity in spite of the significant loss of surface area of the alumina support after thermal aging at 1273 K, indicating that the primary role of La was a Pd stabilizer through the intimate interaction between La and Pd. However, on Pd/La/Al2O3, in which Pd was consecutively impregnated after the impregnation of La, La preferentially interacted with the alumina support as a form of LaxAlyO2, resulting in the stabilization of the alumina support during thermal aging. XPS results indicated that lanthanum oxide suppressed the formation of PdO interacting with alumina during thermal aging. In the case of Pd/La–Ce/Al2O3, the formation of the solid solution of (CexLa1−x)O2 was not strong enough to maintain the high activity and the good textural property after thermal aging.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1019083704188
    Library Location Call Number Volume/Issue/Year 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...