GLORIA

GEOMAR Library Ocean Research Information Access

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
    Enzyme-catalyzed syntheses of poly(1,6-hexanediyl isophthalate) and poly(1,6-hexanediyl terephthalate) in organic medium (1996)
    Springer
    Polymer bulletin 36 (1996), S. 541-548 
    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 enzyme-catalyzed synthesis of poly(1,6-hexanediyl terephthalate) and poly(1,6-hexanediyl isophthalate) is described. An unsuccessfull attempt to synthesize poly(1,6-hexanediyl o-phthalate) is also presented and the reactivity of those three monomers is discussed according to the enzymatic nature of the catalyst. The crude polyesters are characterized by 1H and 13C NMR spectroscopy and by differential scanning calorimetry. Macrocycles are isolated from poly(1,6-hexanediyl isophthalate) and characterized by steric exclusion chromatography and by mass spectrometry. The number-average molar masses and the thermal properties of the crude, linear and cyclic polyesters are also reported.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00342444
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 2
    Electronic Resource
    Electronic Resource
    Dimerization of 1-isopropenyl anthracene by TiCl4 (1979)
    Springer
    Polymer bulletin 1 (1979), S. 469-473 
    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 1-isopropenyl anthracene was dimerized by reaction with TiCl4 in CH2Cl2 and the structure of the dimer studied by 1H NMR spectroscopy. The spectrum was assigned and is in agreement with simulation. The structure results from the attack of carbocation on carbon 9.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00255710
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 3
    Electronic Resource
    Electronic Resource
    Dimerization of 9-isopropenyl phenanthrene by TiCl4 (1979)
    Springer
    Polymer bulletin 1 (1979), S. 475-479 
    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 9-isopropenyl phenanthrene was dimerized by reaction with TiCl4, in CH2Cl2 and the structure of the dimer studied by 1H NMR spectroscopy. The structure results from the attack of carbocation on carbon 9.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00255711
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 4
    Electronic Resource
    Electronic Resource
    Evidence of isomerization of 5-methylenebicyclo[2.2.1] hept-2-ene cation by13C NMR spectroscopy (1981)
    Springer
    Polymer bulletin 4 (1981), S. 45-52 
    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 Cations obtained by reaction of various protonic acids with 5-Methylenebicyclo [2.2.1] hept-2-ene (5-methylene-2-norbornene) have been studied by C NMR spectroscopy. The isomerization of initial carbocation has been pointed out. A correlation of these results with the structure of the corresponding polymers has been established The cationic polymerization of 5-Methylenebicyclo [2.2.1] hept2-ene (5-methylene-2-norbornene) has been investigated several times and KENNEDY (1974) published a review on this topic. A structure of the polymer obtained by classical cationic initiation has been suggested; this results from infrared and X.R. diffraction studies. In a recent work IVIN et al. (1980) reported the13C NMR spectrum of a poly[5-methylenebicyclo [2.2.1] hept-2-ene] resulting from a Ziegler-Natta initiation. We obtained the same13C NMR spectrum as IVIN et al. when the initiator were TiCl4, CF3 COOH, CCl3COOH and concentrated H2SO4 (see fig.1). Chemical shifts and coupling constants $$J_{13_{C - H} } $$ fit with the generally accepted structure of the polymers: KENNEDY and MAKOWSKY (1967) suggested an isomerization of the active species:
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01045239
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 5
    Electronic Resource
    Electronic Resource
    Cationic polymerization of various isopropenyl aromatic monomers (1979)
    Springer
    Polymer bulletin 1 (1979), S. 465-468 
    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 preparations of 9-and 3-isopropenyl phenanthrene are reported. The cationic polymerization of various isopropenyl aromatic monomers is described. 2-isopropenyl naphthalene, 3-isopropenyl phenanthrene, 2-isopropenyl anthracene give low polymers; 1-isopropenyl naphthalene, 9-isopropenyl phenanthrene, 1-isopropenyl anthracene give only dimers; 9-isopropenyl anthracene does not polymerize. The results are discussed with respect to steric interferences.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00255709
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 6
    Electronic Resource
    Electronic Resource
    Lipozyme-catalyzed transesterification of oligo(methylacrylate)s (1991)
    Springer
    Polymer bulletin 26 (1991), S. 55-62 
    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 Oligo(methylacrylate)s with ester end-group are transesterified by allyl alcohol in the presence of lipozyme as catalyst. The transesterification is regioselective: only end-group is modified. The structure of the modified oligomers is studied by 13C NMR spectroscopy.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00299348
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 7
    Electronic Resource
    Electronic Resource
    Composés modèles pour étudier la synthèse de polyesters insaturés (1979)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 180 (1979), S. 1149-1158 
    Details
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: In order to study the side reactions occuring during the synthesis of unsaturated polyesters, several 2-hydroxypropyl esters were synthesized by reduction of the corresponding acetylmethyl esters 1a-i. It was found that on heating they are partly isomerized to the 1-methyl-2-hydroxyethyl esters. The extent of isomerization was determined at various temperatures by NMR spectroscopy, both in solution and in bulk. An analysis of the NMR spectra is given and a mechanism of the isomerization is suggested.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1979.021800503
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 8
    Electronic Resource
    Electronic Resource
    Ion aggregation in magnesium-neutralized polyester resins  -  Small angle X-ray scattering study (1990)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 191 (1990), S. 639-650 
    Details
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Evidence for ion aggregation was found in SAXS studies of models of unsaturated polyester resins: magnesium icosanoate, magnesium α,ω-dicarboxylatopoly(ethylene adipate), -poly(1-hexylethylene adipate), -poly(propylene succinate), and -poly(propylene maleate-co-fumarate), swollen by various solvents or in the dry state. The results were compared with those obtained for commercial unsaturated polyester resins after neutralization with MgO, leading to the conclusion that the formation of aggregates is the key phenomenon of the so-called thickening reaction of polyester resins. The existence of high amounts of branched units in the polyester chain does not appear to hinder ion aggregation. The aggregates are small (Guinier radius RG = 4 to 9 Å) and their average distance increases with chain length and swelling.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1990.021910319
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 9
    Electronic Resource
    Electronic Resource
    Synthesis and curing of poly(styrylpyridine)s. Structural study on models and on the resins, 1. Thermal behaviour of low-molecular-weight styrylpyridines (1987)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 188 (1987), S. 47-65 
    Details
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: It could be shown that the structure of poly(styrylpyridine)s (PSP), which are heat resistant thermosetting resins resulting from the polycondensation of 2,4,6-trimethylpyridine (1) with terephtalaldehyde (2), is much more complicated than that expected from this polycondensation. 2-Styrylpyridines were synthesized from benezaldehyde (5) and 2-methylpyridines and the stability of the respective intermediate alcohol was studied. The thermal behaviour of the styrylpyridines alone or in the presence of their precursors was studied by GPC, IR and NMR spectroscopy and by chemical analyses. It could be shown that the methyl group of 2-methylpyridine (4) adds reversibly to the double bond of 2-styrylpyridine (7) to form 2-phenyl-1,3-bis-(2-pyridyl)propane (8). This side reaction takes place also in the case of the condensation of 1 with 5. The structures and the reactivity of the condensation products of 1 with 1,2 or 3 molecules of 5 (compounds 14, 17 and 18) were studied. The condensation product 19, a component of PSP resins, was synthesized from 1 and 2 and its reactivity was studied at 200 and 250°C and compared with the non-methylated derivative 1,4-bis[2-(2-pyridyl)vinyl]benzene (25). The results of a preliminary analysis of the reactions taking place during the PSP thermosetting are reported.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1987.021880105
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 10
    Electronic Resource
    Electronic Resource
    Synthesis and curing of poly(styrylpyridine)s. Structural study on models and on the resins, 2.Part 1: cf.1. 1H and 13C NMR study of the models (1987)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 188 (1987), S. 67-82 
    Details
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: The structures of the compounds, resulting from the condensation of 2-methylpyridine, 2,6-dimethylpyridine and 2,4,6-trimethylpyridine with benzaldehyde and terephtalaldehyde, were confirmed by high field 1H and 13C NMR spectroscopy. Structural assignments were made based on the NMR spectra of the intermediate compounds, 4-[1-hydroxy-2-4,6-dimethyl-2-pyridyl-ethyl]benzaldehyde (5) and 4-[1-hydroxy-2-(6-methyl-2-pyridyl)ethyl]benzaldehyde (6), of the main reaction products 2-styrylpyridine (3) and 1,4-bis[2-(4,6-dimethyl-2-pyridyl)vinyl]-benzene (1), and of the side reaction product 2-phenyl-1,3-bis(2-pyridyl)propane (4) resulting from the addition of the methyl groups of 2-methylpyridine to the double bond of 3.
    Additional Material: 12 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1987.021880106
    Location Call Number Limitation 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...