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  • 1980-1984  (48)
  • Polymer and Materials Science  (41)
  • Life and Medical Sciences  (4)
  • Analytical Chemistry and Spectroscopy  (3)
  • [abr] BSA; bovine serum albumin
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Material
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  • 1
    Electronic Resource
    Electronic Resource
    Polymerization of 1,3-cycloheptadiene and the structure of poly(1,3-cycloheptadiene)s obtained by ionic initiators (1981)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 182 (1981), S. 215-217 
    Details
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1981.021820123
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    On the salt-linkage formations of porous and nonporous silica particles with trimethylammonium glycol chitosan iodide (1981)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 182 (1981), S. 1715-1724 
    Details
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: The stoichiometry of the salt-linkage formations of nonporous and porous silica particles with trimethylammonium glycol chitosan iodide (TGCI) was investigated by comparing the results of colloid titration and adsorption experiments with those of potentiometric titrations. The surface charge (Q) of colloidal silica as function of pH was evaluated by means of the colloid titration with TGCI. On the other hand, the density (D) of ≡ SiO⊖ groups of silica gel at different pH was also evaluated by the adsorption experiment of TGCI. These results obtained were compared with the Q vs. pH and D vs. pH curves which were obtained by the potentiometric titrations at various ionic strengths for colloidal silica and silica gel, respectively. It was concluded that the ≡ SiO⊖ groups on the surface of nonporous colloid silica form the salt-linkages stoichiometrically with ⊕N(CH3)3-groups in TGCI, whereas the salt-linkage formation between ⊕N(CH3)3-groups in TGCI and ≡ SiO⊖ groups of silica gel does not follow the stoichiometric relationship, since the salt-linkages of the ≡ SiOominus; groups in the pores of the silica gel could be affected by the steric hindrance of the TGCI chain.
    Additional Material: 9 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1981.021820612
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  • 3
    Electronic Resource
    Electronic Resource
    Preparations and asymmetric, reducing abilities of chiral polymeric amine-boranes (1980)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 181 (1980), S. 2563-2569 
    Details
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Polymeric amine-boranes 2b, 4b, and 8c and their corresponding low-molecular-weight model compounds 3b, 5b, and 6b were obtained by reaction of chiral amines with diborane; these amines were poly(pyrrolidine-1,2-diylmethylene) (2a), poly(imino-1-isobutylethylene) (4a), poly{[1,2-bis(4-vinylphenyl)ethyl]amine} (8b), 1-methylpyrrolidin-2-yl-1-pyrrolidinyl-methane (3a), N1-isopentyl-N2-methyl-4-methyl-1,2-pentanediamine (5a), and α-phenylphenethylamine (6a). The polymeric amine-boranes are white powders, stable to be kept for several weeks at room temperature, whereas the low-molecular-weight model compounds are less stable syrup-like materials. The reduction of acetophenone to optically active 1-phenylethanol was carried out with the chiral amine-boranes in the presence of boron trifluoride etherate at various reaction temperatures. The product resulting from the reduction with 8c can easily be separated from the reaction mixture by filtration. The optical yield of the product obtained with 8c was 8,9% at -40°C. The highest optical yield (25,3%) was obtained with α-phenylphenethylamineborane 6b at 0°C.
    Additional Material: 1 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1980.021811213
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  • 4
    Electronic Resource
    Electronic Resource
    Preparation of poly[(3S)-1,2,3,4-tetrahydroisoquinoline-2,3-diylmethylene] and its use as chiral catalyst in the addition of arenethiols to 2-cyclohexen-1-one (1983)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 184 (1983), S. 675-679 
    Details
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Poly[(3S)-1,2,3,4-tetrahydroisoquinoline-2,3-diylmethylene] (4) and (3S)-3-(1,2,3,4-tetrahydroisoquinolin-2-ylmethyl)-2-methyl-1,2,3,4-tetrahydroisoquinoline (7) were prepared using (3S)-1,2,3,4-tetrahydro-3-isoquinolinecarboxylic acid (1) as starting material. The optically active amines 4 and 7 were used as asymmetric catalysts for the addition of thiophenol (8a), 4-tert-butylthiophenol (8b), or 4-chlorothiophenol (8c) to 2-cyclohexen-1-one (9). 4 yielded 3-phenylthiocyclohexanone (10a) with the highest optical yield of 24% at -25°C, showing a marked polymer effect with respect to enantiomeric excess.
    Additional Material: 1 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1983.021840401
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  • 5
    Electronic Resource
    Electronic Resource
    Stoichiometric salt-linkage formation of trimethylammonium glycol chitosan iodide with a carboxylic type ion exchanger (1982)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 183 (1982), S. 1233-1238 
    Details
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: The adsorption of trimethylammonium glycol chitosan iodide (TGCI) on Dowex CCR-2 resin was investigated at different pH values and resin weights. The concentration of Na+ or Ca2+ ions, released by the ion exchange reaction with TGCI, was measured by inductively coupled plasma spectroscopy. It was found that the amount of the released ions is comparable to that of the absorbed TGCI. This indicates that the salt-linkage formation of carboxylate ions of the exchanger with ⊕N(CH3)3-groups in TGCI follows a stoichiometric relationship. This result is discussed in connection with the form of the polymer layer adsorbed on the solid surface.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1982.021830517
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  • 6
    Electronic Resource
    Electronic Resource
    Formaldehyde polymers, 30Part 29: cf.1.. Preparation of 5-hydroxy-4-chromanones and 8-hydroxy-1-tetralon and their properties as UV-absorbers (1982)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 183 (1982), S. 1969-1977 
    Details
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: 5-Hydroxy-6,8-dimethyl-4-chromanone (4a) and 8-hydroxy-5,7-dimethyl-1-tetralon (4b) were synthesized from 6,8-dimethyl-4 chromanone (1a) and 5,7-dimethyl-1-tetralon (1b), respectively. 5-Hydroxy-7-methody-2,2-dimethyl-4-chromanone (6) was prepared from 5,7-dihydroxy-2,2-dimethyl-4-chromanone (5). Cyclohexane solutions of 1a, 1b, 4a, 4b, 6, 5-hydroxymethyl-6,8-dimethyl-4-chromanone (7), 3-hydroxy-2,6-dimethyl-4-chromanone (8), and 2-hydroxy-4-octyloxybenzonphenone (9) were irradiated. The photostability of these compounds was found to decrease in the following order: 4b 〉 4a, 6 〉 9 〉 1a, 1b. 7, 8. Poly(venyl chloride) films containing 5, 0 wt.-% of 4a, 4b, or 6 were found to be stable against photooxidation.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1982.021830816
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  • 7
    Electronic Resource
    Electronic Resource
    Physical properties and structure of silk. III. The glass transition and conformational changes of tussah silk fibroin (1980)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 25 (1980), S. 1813-1813 
    Details
    ISSN: 0021-8995
    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/app.1980.070250830
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  • 8
    Electronic Resource
    Electronic Resource
    ESR study of radiation-induced polymerization of styrene adsorbed on silica gel (1982)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 27 (1982), S. 1259-1268 
    Details
    ISSN: 0021-8995
    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
    Notes: The effect of the specific surface area of silica gels on the radiation-induced polymerization of styrene adsorbed on silica gel was studied by ESR. The same radicals were generated on the silica gels regardless of the specific surface area, but the stability of the radicals at room temperature depended on the specific surface area. This means that the decay of the radicals proceeded mainly on the surface of the silica gel. Almost all the radicals generated by irradiation were initially in the bulk of the silica gel and migrated from the interior to the surface of the gel. When styrene monomer was adsorbed on the surface of the silica gel, the silica gel radicals interacted with the monomer and initiated polymerization and then generated polymer. The rate of migration of the silica gel radical was rather fast in the case of silica gel with a large specific surface area. Thus, the polymerization behavior of styrene adsorbed on silica gel greatly depended on the specific surface area of the gel.
    Additional Material: 9 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1982.070270415
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  • 9
    Electronic Resource
    Electronic Resource
    Melt viscosity of acrylic copolymers (1984)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 29 (1984), S. 3479-3490 
    Details
    ISSN: 0021-8995
    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
    Notes: The melt flow behavior of methyl methacrylate (MMA) copolymerized with methyl acrylate (MA) was measured and analyzed in terms of the molecular structure of the copolymers. Measurement was done by using a capillary rheometer in the shear rate range from 6 × 100 to 3 × 103 s-1 and in temperatures from 160°C to 280°C. The Newtonian flow pattern appeared in lower shear rate and higher temperature regions. However, with increasing shear rate at lower temperature, viscosity decreased to a constant slope on a logarithmic scale. The melt fracture arose at the critical shearing stress point Sc of 6 × 106 dyn/cm2. A die swell also appeared in the shear rate range larger than 1 × 106 dyn/cm2, and its maximum value was two times larger than that of the capillary diameter. The decrease in viscosity with increasing shear rate is explained in terms of the apparent energy of activation in flow Eα*. Eα* also decreases with increasing shear rate. The exponential relation of Eα* to η is maintained in the higher shear rate. The lowering of viscosity in lower shear rate, however, is attributed to not only the change in Eα* but also the change in the volume of flow unit. The melt viscosity increases in inverse proportion to the MA content in the copolymers which form more flexible chains. Syndiotactic form of MMA has increased viscosity, caused by the rigidifying of segmented chains, rather than the strengthening of intermolecular interaction.
    Additional Material: 12 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1984.070291123
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  • 10
    Electronic Resource
    Electronic Resource
    Dielectric studies of aqueous solutions of poly(L-glutamic acid) (1981)
    New York : Wiley-Blackwell
    Biopolymers 20 (1981), S. 2567-2582 
    Details
    ISSN: 0006-3525
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The dielectric features of poly(L-glutamic acid) are studied by the Fourier synthesized pseudorandom noise method in a time domain combined with a four-electrode cell. Polymer concentration dependence, the effect of the solvent viscosity, salt effects, and pH dependence are studied concomitantly with measurements of CD. A helix-to-coil transition occurs near pH 5.6 for a salt-free solution; at higher pH values, the polymer has an ionized random-coil conformation, and at lower pH, it has a deionized α-helical conformation. When it is in the ionized random-coil conformation, with the usual features of an electrolytic polymer, the solution shows a relaxation spectrum with a large dielectric increment at low frequencies. In the deionized α-helical state, no distinct relaxation curves are obtained, which does not deny the existence of a permanent peptide dipole. The pH dependence of the dielectric increment does not mainly correspond to the conformational change from helix to coil, but rather corresponds to the change of chain expansion on account of a charge-charge interaction under low ionic strength, which is conceived of by a viscosity measurement.
    Additional Material: 10 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bip.1981.360201207
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