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  • Polymer and Materials Science  (1.925)
  • Wiley-Blackwell  (1.925)
  • American Geophysical Union
  • Institute of Physics
  • 1975-1979  (977)
  • 1965-1969  (680)
  • 1955-1959  (268)
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Schlagwörter
Verlag/Herausgeber
  • Wiley-Blackwell  (1.925)
  • American Geophysical Union
  • Institute of Physics
Erscheinungszeitraum
Jahr
  • 1
    Digitale Medien
    Digitale Medien
    Polymerization of vinylpyridinium salts. IX. Preparation of monomeric salt pairs (1977)
    New York : Wiley-Blackwell
    Journal of Polymer Science: Polymer Letters Edition 15 (1977), S. 487-491 
    Details
    ISSN: 0360-6384
    Schlagwort(e): Chemistry ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/pol.1977.130150808
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  • 2
    Digitale Medien
    Digitale Medien
    Graft copolymers of starch. III. Copolymerization of gelatinized wheat starch with acrylonitrile. Influence of chain modifiers on copolymer compositionProd. No. 1476 (1967)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 11 (1967), S. 457-463 
    Details
    ISSN: 0021-8995
    Schlagwort(e): Chemistry ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie , Maschinenbau , Physik
    Notizen: A study was made of the influence of selected chain modifiers on both the molecular weight of grafted polyacrylonitrile and the grafting frequency of the starch-polyacrylo-nitrile graft copolymer. Gelatinized wheat starch was used with ceric ammonium nitrate as the initiator. The organic chain modifiers investigated were ethyl mercaptan, 1-dodecanethiol, methyl ethyl ketone, acetaldehyde, and chloroform. Sodium chromate, cupric bromide, cupric nitrate, cupric acetate, and cupric chloride were also tested as chain modifiers. In the presence of cupric chloride, there was a tenfold reduction in the molecular weight of grafted polyacrylonitrile; however, fewer chains were grafted to the starch backbone than were observed without cupric chloride.
    Zusätzliches Material: 4 Tab.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/app.1967.070110312
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  • 3
    Digitale Medien
    Digitale Medien
    Copolymers of starch and polyacrylonitrile: The dilution effect (1969)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 13 (1969), S. 133-140 
    Details
    ISSN: 0021-8995
    Schlagwort(e): Chemistry ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie , Maschinenbau , Physik
    Notizen: In the ceric ammonium nitrate-initiated graft polymerization of acrylonitrile (AN) with starch, grafting frequencies and molecular weights of grafted polyacrylonitrile changed from 600 anhydroglucose units (AGU)/graft and 120000 to 280 AGU/graft and 36000 when concentrations of starch and AN were varied from 0.27 and 1.20 to 0.023 and 0.235 moles/l. of water, respectively. The influence of variety of starch, size of the starch granules, and reaction time was studied, and possible reasons for the influence of reactant concentration on the composition of the copolymer are considered.
    Zusätzliches Material: 4 Tab.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/app.1969.070130114
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  • 4
    Digitale Medien
    Digitale Medien
    Polarographic studies of ion binding, I. Cadmium carboxymethylcellulose (1978)
    Weinheim : Wiley-Blackwell
    Angewandte Makromolekulare Chemie 70 (1978), S. 39-48 
    Details
    ISSN: 0003-3146
    Schlagwort(e): Chemistry ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie , Physik
    Beschreibung / Inhaltsverzeichnis: Die Bindung von Cadmiumionen an Carboxymethylcellulose (CMC) wurde polarographisch untersucht. Zwei CMC-Proben mit dem mittleren Substitutionsgrad von 0,80 und 1,14 wurden dazu ausgewählt. Der Anteil an freien Ionen bleibt über einen großen Konzentrationsbereich der CMC-Lösungen konstant und steigt mit dem Neutralisationsgrad. Die Ergebnisse werden anhand des Zwei-Phasen-Modells von Oosawa interpretiert.
    Notizen: The polarographic method of analysis was applied to study cadmium ion binding in carboxymethyl cellulose (CMC) solutions. Two CMC samples of average degree of substitution 0.80 and 1.14 were selected. The degree of free ions virtually remains constant in wide range of concentrations of CMC solutions and decreases with degree of neutralization. The results are interpreted according to Oosawa's two phase model of polyelectrolytes.
    Zusätzliches Material: 4 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/apmc.1978.050700104
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  • 5
    Digitale Medien
    Digitale Medien
    Graft copolymers of starch. I. Copolymerization of gelatinized wheat starch with acrylonitrile. Fractionation of copolymer and effect of solvent on copolymer compositionPresented in part at the 149th meeting of the American Chemical Society, Detroit, Michigan, April 1965.Prod. No. 1353 (1966)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 10 (1966), S. 929-937 
    Details
    ISSN: 0021-8995
    Schlagwort(e): Chemistry ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie , Maschinenbau , Physik
    Notizen: The starch-polyacrylonitrile graft copolymer prepared from gelatinized wheat starch with ceric ammoninm nitrate as the initiator has been freed of ungrafted polyacrylonitrile and separated into fractions by extraction with dimethylformamide, γ-butyrolactone, and dimethyl sulfoxide. The copolymer fractions obtained differed appreciably in level of add-on, molecular weights of grafted chains, and grafting frequency. To determiue the molecular weights of grafted chains, the starch part of the copolymer was effectively removed by hydrolysis with α-amylase. It was necessary to dissolve or swell the polymer in dimethyl sulfoxide and freshly precipitate it by addition to water before enzymatic hydrolysis. In studying the effect of reaction medium on copolymer composition, there was less ungrafted homopolymer formed and a higher yield of graft copolymer possessing more frequent grafts with water than with aqueous dimethylformamide or aqueous ethylene glycol. Polymer solubility, the results of control polymerizations of acrylonitrile in the absence of starch, and the detection of glucose endgroups on the polyacrylonitrile liberated from the fractionated polymer by hydrolysis are presented as evidence that the copolymers obtained are true grafts rather thau intimate mixtures.
    Zusätzliches Material: 1 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/app.1966.070100610
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  • 6
    Digitale Medien
    Digitale Medien
    Permeation of water vapor through cellulose triacetate membranes in hollow fiber form (1978)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 22 (1978), S. 2307-2323 
    Details
    ISSN: 0021-8995
    Schlagwort(e): Chemistry ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie , Maschinenbau , Physik
    Notizen: A modification of the carrier gas method for measuring permeability of a hollow fiber to a vapor is described with particular application to water vapor permeation through asymmetric cellulose triacetate in hollow fiber from. Conventional methods are inadequate because the high flux of permeation vapor combined with its low pressure on the permeate side and the small diameter of the fiber lead to an excessive buildup of pressure in the permeate stream - in some cases so great as to render much of the fiber length ineffective. The method described in this paper involves the permeation from the outside to the inside of the fiber of a binary mixture consisting of the water vapor and a fairly highly permeable carrier (helium). There is a significant pressure drop along the fiber, but a theoretical treatment is presented to take this into account and to permit a determination of the vapor permeability. Experiments at 35°C over a range of water vapor pressures up to 1.7 cm Hg gave a water flux of 9 × 10-3 cc(S.T.P.)/cm2-sec-cm Hg, with an apparent slight decrease with increasing pressure. Over the same range of water vapor pressure the helium flux decreased from 2.3 × 10-4 to 1.85 × 10-4 cc(S.T.P.)/cm2-sec-cm Hg.
    Zusätzliches Material: 6 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/app.1978.070220822
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  • 7
    Digitale Medien
    Digitale Medien
    Hyaluronidase-bound membrane as a biomaterial for implantable fuel cells (1976)
    Hoboken, NJ : Wiley-Blackwell
    Journal of Biomedical Materials Research 10 (1976), S. 283-294 
    Details
    ISSN: 0021-9304
    Schlagwort(e): Chemistry ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Medizin , Technik allgemein
    Notizen: A new biomaterial containing covalently bound hyaluronidase was prepared. An application of this enzyme membrane is to improve the performance of an implantable fuel cell. Hyaluronic acid is a contributor to the viscosity of tissue fluids but can be a potential fuel source because of its sugar content. The incorporation of immobilized hyaluronidase would not only contribute to a more available fuel supply by splitting hyaluronic acid but, perhaps more importantly, enhance the rate of mass transport of fuel, O2, and reaction products by reducing the viscosity near the electrode membranes. Hyaluronidase was bound to Sepharose gel and its thermoplastic membrane after activation by cyanogen bromide. Fourteen and 22% of the activities were recovered from the gel and membrane, respectively. The activity of the bound enzyme was stable for six months at 0°C. The addition of hyaluronic acid, 1 mg/ml, to a typical implantable type bioautofuel cell in vitro increased external solution viscosity from 1.1 to 2.5-2.8 cP and reduced voltage output under 10 kΩ by 60% in 3 hr. When the hyaluronidase bound membrane was placed at the anode, viscosity of the glucose-hyaluronic acid solution was lowered to 1.8 cP and the cell output increased to the original level of a glucose-fueled cell in 3 hr. Glucosamine-equivalent released from hyaluronic acid at the electrode was 3.1 mg after 22.5 hr. This represents 90% of the theoretical consumption. Restoration of the cell output was probably a combination of the enhanced transport of fuel, O2 and products, and/or appearance of a new fuel, glucosamine-equivalent.
    Zusätzliches Material: 4 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/jbm.820100209
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  • 8
    Digitale Medien
    Digitale Medien
    Viscosity of dilute solutions of linear and branched polyvinyl acetateA preliminary account of this work was presented at the Ann Arbor High Polymer Research Conference, July 25, 1955. (1956)
    Hoboken, NJ : Wiley-Blackwell
    Journal of Polymer Science 22 (1956), S. 123-135 
    Details
    ISSN: 0022-3832
    Schlagwort(e): Chemistry ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie , Physik
    Notizen: The dilute solution viscosity properties of fractions of two linear and one branched sample of polyvinyl acetate in benzene and of two linear and one branched fraction in several solvents were measured at 35°C. Values of total slope, b (from plots of ηsp/c vs. c), and intrinsic viscosities were obtained under the requirement that k′ + β = 0.500 ± 0.002. Empirical plots of log b vs. log [η] gave lines which were straight within the limits of accuracy of the data. For the linear fractions in benzene, Huggins' k′ was constant and the slope of the log b vs. log [η] line was 2; for the branched fractions in benzene, k′ increased with [η] and the slope of the log b vs. log [η] line was greater than 2. The log b vs. log [η] plots form the basis for a “one-point” method for determining [η]. Consideration of these data along with results reported in the literature indicates that k′ is measurably sensitive to branching only for fractions possessing a certain minimum combination of size and complexity. However, in some cases where the variations of k′ are inconclusive, use of the slope of the log b vs. log [η] line may provide a reliable indication of branching. It was found that a comparison between the branched and linear series could also be made at constant values of [η] or b. Two linear fractions in different solvents obeyed a type of Huggins relationship in which k′ did not vary with solvent and the slope of the log b vs. log [η] line was 2. For a higher molecular weight branched fraction, however, k′ varied from solvent to solvent and the slope of the log-log plot was about 1.7. These data do not support a reference point concept of “true” intrinsic viscosity based on a simple linear relationship between b and [η]. Preliminary results dealing with the effects of the shear rate indicated that the measured viscosity properties of branched fractions may be more seriously affected by changes in shear rate than those of linear fractions.
    Zusätzliches Material: 5 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/pol.1956.1202210014
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  • 9
    Digitale Medien
    Digitale Medien
    A further interpretation of resonance and electrical factors affecting copolymerization (1959)
    Hoboken, NJ : Wiley-Blackwell
    Journal of Polymer Science 40 (1959), S. 457-468 
    Details
    ISSN: 0022-3832
    Schlagwort(e): Chemistry ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie , Physik
    Notizen: New equations for evaluation of resonance (q) and electrical (∊) factors affecting copolymerization have been derived: \documentclass{article}\pagestyle{empty}\begin{document}$ \begin{array}{*{20}c} {r_1 } \hfill & { = \exp \left\{ { - {{\left( {q_1 - q_2 } \right)} \mathord{\left/ {\vphantom {{\left( {q_1 - q_2 } \right)} {RT}}} \right. \kern-\nulldelimiterspace} {RT}}} \right\}\exp \left\{ { - 7.23 \times 10^{20} \varepsilon _1 {{\left( {\varepsilon _1 - \varepsilon _2 } \right)} \mathord{\left/ {\vphantom {{\left( {\varepsilon _1 - \varepsilon _2 } \right)} {RT}}} \right. \kern-\nulldelimiterspace} {RT}}} \right\}} \hfill \\ {r_2 } \hfill & { = \exp \left\{ { - {{\left( {q_2 - q_1 } \right)} \mathord{\left/ {\vphantom {{\left( {q_2 - q_1 } \right)} {RT}}} \right. \kern-\nulldelimiterspace} {RT}}} \right\}\exp \left\{ { - 7.23 \times 10^{20} \varepsilon _2 {{\left( {\varepsilon _2 - \varepsilon _1 } \right)} \mathord{\left/ {\vphantom {{\left( {\varepsilon _2 - \varepsilon _1 } \right)} {RT}}} \right. \kern-\nulldelimiterspace} {RT}}} \right\}} \hfill \\ {r_1 r_2 } \hfill & { = \exp \left\{ { - 7.23 \times 10^{20} {{\left( {\varepsilon _1 - \varepsilon _2 } \right)^2 } \mathord{\left/ {\vphantom {{\left( {\varepsilon _1 - \varepsilon _2 } \right)^2 } {RT}}} \right. \kern-\nulldelimiterspace} {RT}}} \right\}} \hfill \\ \end{array} $\end{document} The new equations will apply over any temperature range, and will express ∊ in terms of e.s.u. and q in kcal./mole. These factors were determined for an extensive list of monomers and were tabulated. Agreement with Hammett σ values and other kinetic and theoretical considerations were found.
    Zusätzliches Material: 1 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/pol.1959.1204013715
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  • 10
    Digitale Medien
    Digitale Medien
    Graft copolymers of starch. II. Copolymerization of gelatinized wheat starch with acrylonitrile: Influence of reaction conditions on copolymer compositionReported in part at the 149th Meeting, American Chemical Society, Detroit, Michigan, April 1965. (1966)
    New York : Wiley-Blackwell
    Journal of Polymer Science Part B: Polymer Letters 4 (1966), S. 765-769 
    Details
    ISSN: 0449-2986
    Schlagwort(e): Chemistry ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Zusätzliches Material: 2 Tab.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/pol.1966.110041018
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