Library

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
    Polymerization and copolymerization of vinyl chloroformate (1981)
    Springer
    Polymer bulletin 4 (1981), S. 699-704 
    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 Use of peroxydicarbonates as free-radical initiators for the polymerization of vinyl chloroformate (VOCC1), in bulk and in solution, leads to high molecular weight polymers. Copolymerization parameters of VOCC1 with vinyl acetate have been determined in methylene chloride, at 35°C, with dicyclohexyl peroxydicarbonate as initiator
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00285136
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 2
    Electronic Resource
    Electronic Resource
    Polymerization and copolymerization of vinyl carbamates and vinyl carbonates (1981)
    Springer
    Polymer bulletin 4 (1981), S. 705-710 
    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 Poly(vinyl carbamates) and poly(vinyl carbonates) of high molecular weight have been obtained by polymerization of the corresponding monomers prepared from vinyl chloroformate. Poly(vinyl carbonates) can also be prepared by chemical modification of poly(vinyl chloroformate) with alcohols and phenols. Copolymerization parameters of phenyl vinyl carbonate with vinyl acetate have been determined in methylene chloride, at 35°C, with dicyclohexyl peroxydicarbonate as initiator.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00285137
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 3
    Electronic Resource
    Electronic Resource
    Poly(vinyl) chloroformate and derivatives (1979)
    Springer
    Polymer bulletin 1 (1979), S. 809-815 
    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 Poly(vinyl chloroformates) of high molecular weight have been successfully modified by amines and by KCN. Poly (vinyl carbonates) have been prepared by polymerization of phenyl vinyl carbonate.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00283213
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 4
    Electronic Resource
    Electronic Resource
    Conductance of some tetraphenylborides with cryptates as counter-ions in tetrahydrofuran (1975)
    Springer
    Journal of solution chemistry 4 (1975), S. 873-891 
    Details
    ISSN: 1572-8927
    Keywords: Cryptates ; tetraphenylborides ; conductivity ; associations ; ion pairs ; ionic radii ; THF-enthalpy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract The conductance behavior of potassium tetraphenylboride and of sodium and potassium tetraphenylborides complexed by macroheterobicycles was studied in tetrahydrofuran over a temperature range of −70 to +20°C. Stokes' radii of potassium and of alkaline cryptates were compared with ionic radii. The conductance data were analyzed by a more careful method than that usually used for this solvent. This leads to an interpretation of the physical meaning of the distance parameter in agreement with Bjerrum's concept for the distinction between short- and long-range electrostatic interactions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00649879
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 5
    Electronic Resource
    Electronic Resource
    Chemical modification of poly(vinyl chloroformate) and of its copolymers using phase transfer catalysis (1983)
    Springer
    Polymer bulletin 9 (1983), S. 114-120 
    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 The chemical modification of poly(vinyl chloroformate) and of its copolymers with compounds containing labile hydrogen atoms like amines, phenols, alcohols and 2-oxazolidone as well as with potassium cyanide and potassium fluoride has been investigated. Phase transfer catalysis conditions lead to soluble modified polymers with good substitution yields.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00275577
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 6
    Electronic Resource
    Electronic Resource
    Enantiospecific enzymatic preparation of (2S,3S)-3-alkylaspartic acids of current interest in the synthesis of stereoregular poly[β-(2S,3S)-3-alkylmalic acids] as new optically active functional polyesters (1996)
    New York, NY [u.a.] : Wiley-Blackwell
    Chirality 8 (1996), S. 300-304 
    Details
    ISSN: 0899-0042
    Keywords: β-methylaspartase ; alkylfumarates ; (2S,3S)-3-methylaspartic acid ; (2S,3S)-3-isopropylaspartic acid ; bioconversion ; (3S,4R)-benzyl 3-alkylmalolactonates ; poly[benzyl-β-(2S,3S)-3-alkylmalates] ; Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: (2S,3S)-3-methyl- and 3-isopropylaspartic acids were synthesized by bioconversion of the corresponding alkylfumarates (mesaconate and 3-isopropylfumarate) using β-methylaspartase from cell-free extracts of Clostridium tetanomorphum. Optically pure (2S,3S)-3-alkylaspartic acids were transformed in several steps to benzyl (3S,4R)-3-alkylmalolactonates without any racemization of the two chiral centers. These optically active α,β-substituted-β-lactones were polymerized by anionic ring opening polymerization yielding optically active semi-crystalline polyesters. 13C NMR analysis of poly[benzyl β-3-isopropylmalate] in CDCl3 has shown that only the iso-type stereosequence is present in the polymer, indicating that the macromolecular chain is constituted by the only units of benzyl β-(2S,3S)-3-isopropylmalate monomer. The polymerization reaction was done without any racemization of the two stereogenic centers as in the case of benzyl (3S,4R)-3-methylmalolactonate. © 1996 Wiley-Liss, Inc.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
  • 7
    Electronic Resource
    Electronic Resource
    Anionic polymerization of octamethylcyclotetrasiloxane in aqueous emulsion I: Preliminary results and kinetic study (1994)
    New York, NY [u.a.] : Wiley-Blackwell
    Polymer International 35 (1994), S. 179-188 
    Details
    ISSN: 0959-8103
    Keywords: anionic polymerization ; octamethylcyclotetrasiloxane ; emulsion ; α,ω-dihydroxy polydimethylsiloxane ; 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 synthesis of poly(dimethylsiloxane) (PDMS) by anionic polymerization of octamethylcyclotetrasiloxane (D4) in aqueous emulsion using an emulsifying agent acting also as initiator (benzyldimethyldodecylammonium hydroxide) is described. Stable emulsions of α,ω-dihydroxy PDMS with an easily controlled molar mass (up to 15 000), a low polydispersity index and high yields were obtained. The amount of cyclics formed (essentially D4 to D7) is lower than that observed in bulk. Kinetics analysis and computerized simulations are in good agreement with a reaction scheme involving simultaneous polyaddition/polycondensation processes. At high monomer consumption, polycondensation predominates leading to a broadening of the molecular weight distribution (MWD). The apparent rate constants of initiation, propagation and condensation at various temperatures and the corresponding activation energies were determined.
    Additional Material: 10 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pi.1994.210350208
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 8
    Electronic Resource
    Electronic Resource
    Obvious complexity of the anionic polymerization of malolactonic acid esters (1998)
    Springer
    Polymer bulletin 40 (1998), S. 381-387 
    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 The anionic polymerization and copolymerization of butyl and benzyl malolactonates initiated with potassium acetate/dibenzo-18-crown-6 or [222] complex have been studied at 40°C in bulk and in dichloromethane and tetrahydrofuran solutions. Kinetics and polymer molecular weights were followed by SEC. In bulk and for conversion below 30%, molecular weights are close to those calculated for a living process then the conversion increase leads to a significant discrepancy between theoretical and measured molecular weights. In solution, side reactions take place significantly and no evident relationship between molecular weight and initiator concentration can be established, even at low conversion. Same situation was observed in the case of block copolymers synthesis. At last, evidence for transfer reactions has been shown by using model reactions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s002890050266
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 9
    Electronic Resource
    Electronic Resource
    Synthesis of stereoregular poly[(2S,3S)-benzyl β-3-methylmalate] (1996)
    Weinheim : Wiley-Blackwell
    Macromolecular Rapid Communications 17 (1996), S. 209-216 
    Details
    ISSN: 1022-1336
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: The asymmetric lactone (3 S, 4 R)-3-methyl-4-benzyloxycarbonyl-2-oxetanone (6) was anionically polymerized to give an insoluble, crystalline, highly isotactic polymer with (2 S, 3 S)-benzyl β-3-methylmalate repeating units. Solubility was achieved by copolymerization of 6 with the recemic (R, S)-butyl malolactonate (7). The semicrystalline copolymer was characterized (M̄n = 107 000, Tg = 29,6°C, Tm = 161°C, [α] = 1,5 deg · dm-1 · g-1 · cm3) and its stereosequence investigated by 13C NMR.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/marc.1996.030170403
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 10
    Electronic Resource
    Electronic Resource
    Kinetics of the polymerization of isoprene initiated by α, ω-dilithiopolyisoprene in hexane (1990)
    Basel : Wiley-Blackwell
    Die Makromolekulare Chemie, Rapid Communications 11 (1990), S. 329-335 
    Details
    ISSN: 0173-2803
    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/marc.1990.030110705
    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...