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  • Artikel  (32.515)
  • Springer  (20.252)
  • Springer Nature  (7.528)
  • Wiley-Blackwell  (3.194)
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  • 1980-1984  (17.181)
  • 1975-1979  (15.334)
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  • Artikel  (32.515)
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  • 1980-1984  (17.181)
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  • 1
    Digitale Medien
    Digitale Medien
    Revisal of the chain equilibration process in strained polymer melts (1982)
    Springer
    Polymer bulletin 6 (1982), S. 541-546 
    Details
    ISSN: 1436-2449
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Chemie und Pharmazie , Maschinenbau , Physik
    Notizen: Summary The retraction of stretched molecules explains the intermediate step of relaxation observed at short times with strained polymer melts instead of a single rubberlike plateau. The stress relaxation following a rapid deformation is derived in this zone of the spectrum from the non linear, quasi elastic response of the transient network formed by the system of entangled chains. This method corrects an approximate calculation of the modulus decline in DOI's original treatment of the molecular equilibration process.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00256376
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  • 2
    Digitale Medien
    Digitale Medien
    Formation of aldonic acid end groups during NO2/O2 treatment and alkali cooking of wood meal (1982)
    Springer
    Polymer bulletin 6 (1982), S. 547-552 
    Details
    ISSN: 1436-2449
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Chemie und Pharmazie , Maschinenbau , Physik
    Notizen: Summary The increased carbohydrate yield after NaOH cooking of wood resulting from NO2/O2 pretreatment is related to the oxidation of reducing sugar end groups to aldonic acid groups during both the pretreatment and the subsequent alkali cook. This leads to a suppressed end-wise degradation during the alkali cook, reflected in a lowered formation of 3-deoxyaldonic and 2-C-methylglyceric acid end groups in competing reactions.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00256377
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  • 3
    Digitale Medien
    Digitale Medien
    Alkali catalysed curing of starch-melamine resin systems (1982)
    Springer
    Polymer bulletin 6 (1982), S. 553-558 
    Details
    ISSN: 1436-2449
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Chemie und Pharmazie , Maschinenbau , Physik
    Notizen: Summary The curing process in starch adhesives modified with melamine resin can take place by co-condensation or self-condensation. A high degree of co-condensation is required to provide a good water resistance of a cured glue joint. This can be attained by using melamine resins with a high concentration of hydroxymethylamino groups. The reduced effect of the adhesive on storage is due to a degradation of the melamine resin through the elimination of formaldehyde.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00256378
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  • 4
    Digitale Medien
    Digitale Medien
    Raman spectrum of the high pressure phase of polyethylene (1982)
    Springer
    Polymer bulletin 6 (1982), S. 559-564 
    Details
    ISSN: 1436-2449
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Chemie und Pharmazie , Maschinenbau , Physik
    Notizen: Summary The Raman spectrum of the hexagonal high pressure phase of polyethylene was measured at 5.2 kbar and 240 °C, using a hydrostatic high pressure cell. The spectrum is largely identical to that obtained for the melt. This result indicates that the conformational short range order in the hexagonal phase remains melt —like and is not modified by the overall straightening of chains.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00256379
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  • 5
    Digitale Medien
    Digitale Medien
    Reactive polymers (1982)
    Springer
    Polymer bulletin 6 (1982), S. 565-570 
    Details
    ISSN: 1436-2449
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Chemie und Pharmazie , Maschinenbau , Physik
    Notizen: Summary It has been found that the three-phase heterogeneous reaction of propane sultone with hydrolyzed macroporous glycidylmethacrylate copolymers in an aqueous alkaline medium proceeds to a higher degree in presence of phase transfer catalyst. The best results were obtained using tetra(n-butyl)ammonium hydroxide. An important finding is the increase in the degree of transformation of the reaction in flow arrangement compared with the batch procedure. The influence of phase transfer catalyst is also more effective. The reaction is discussed with respect to the properties of the products, i.e. of the overall and surface contents of groups introduced into the reaction, of the specific surface area and specific pore volume of sulfopropylated copolymers.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00256380
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  • 6
    Digitale Medien
    Digitale Medien
    The polymerization of isobutylene with VCl4 and ammonia (1982)
    Springer
    Polymer bulletin 6 (1982), S. 571-576 
    Details
    ISSN: 1436-2449
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Chemie und Pharmazie , Maschinenbau , Physik
    Notizen: Summary The initiation effect of ammonia on the polymerization of isobutylene in the presence of VCl4 has been revealed. The polymerizations were carried out in the dark without solvent and in heptane solution in the temperature range between 263 and 198 K, where the molecular weight of the polymer increased linearly with decreasing temperature (log Mη against 1/T). The polymer yield depended on the molar ratio of ammonia to VCl4 and was highest at 1∶1, but the polymerizations proceeded also at a molar ratio higher than 1. At NH3/VCl4 = 1 the polymerization rate increased with VCl4 concentration and with decreasing temperature.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00255157
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  • 7
    Digitale Medien
    Digitale Medien
    Coordination polymers (1982)
    Springer
    Polymer bulletin 6 (1982), S. 243-249 
    Details
    ISSN: 1436-2449
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Chemie und Pharmazie , Maschinenbau , Physik
    Notizen: Summary Chelate polymers obtained from bis(2,4-dihydroxybenzaldehyde) M2+ (M = Fe2+, Co2+, Ni2+, Zn2+) with organic acid chlorides were synthesized and characterized by elemental a-nalysis, magnetic and electric measurements, spectral and thermogravimetric studies.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00255393
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  • 8
    Digitale Medien
    Digitale Medien
    Macromer copolymerization reactivity ratio determined by GPC analysis (1982)
    Springer
    Polymer bulletin 6 (1982), S. 235-241 
    Details
    ISSN: 1436-2449
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Chemie und Pharmazie , Maschinenbau , Physik
    Notizen: Summary In this paper is decribed a new method for determining copolymerization reactivity ratios r by using high resolution gel permation chromatography. The system of monomers is a new one involving a macromer. Separation of each monomer, copolymer and solvent allows calculation of concentration of reactants and products, so as the copolymer molecular weight distribution. Three different methods were used to interprete copolymerization experiments, at various feed compositions, and in function of conversion, in minimizing errors on peak surface area. The conventional methods were used to calculate r and evaluate their accuracies.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00255392
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  • 9
    Digitale Medien
    Digitale Medien
    Synthesis of statistical polydiene networks by reaction of liquid polyenes with telechelic siloxanes (1982)
    Springer
    Polymer bulletin 6 (1982), S. 251-257 
    Details
    ISSN: 1436-2449
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Chemie und Pharmazie , Maschinenbau , Physik
    Notizen: Abstract The present investigation concerns the synthesis of statistical networks similar to vulcanized rubber. We have used liquid precursor polymers: polybutadiene (PB) and polyisoprene (PI) with telechelic siloxanes. The reactivity of the polydienes can be classified as follows: PB units 1,2 ⋙ PI units 3,4 ⋙ PI units 1,4 ≃ 0. The network formation is a function of the ratio R = nb, of pendent double bonds/nb. of ≃ SiH. For R ≃ 1 the networks are rather hard and brittle, for 8 ⩽ R ⩽ 10 they are soft and elastic, whereas for R ≃ 16 the gels obtained are very soft and sticky.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00255394
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  • 10
    Digitale Medien
    Digitale Medien
    Disodium tetracarbonylferrate (1982)
    Springer
    Polymer bulletin 6 (1982), S. 299-303 
    Details
    ISSN: 1436-2449
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Chemie und Pharmazie , Maschinenbau , Physik
    Notizen: Summary The replacement of the chlorine atoms of chloromethylated polystyrenes by carboxyl groups via reaction with disodium tetracarbonylferrate and subsequent treatment with an oxidizing agent is described.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00255401
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