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  • Digitale Medien  (8)
  • 1970-1974  (4)
  • 1960-1964  (4)
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Materialart
  • Digitale Medien  (8)
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  • 1
    Digitale Medien
    Digitale Medien
    Characterization of polymers in large deformation by repeated chemical stress relaxation of vulcanized rubbers (1974)
    Springer
    Rheologica acta 13 (1974), S. 127-134 
    Details
    ISSN: 1435-1528
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Chemie und Pharmazie , Physik
    Notizen: Summary In this investigation, the repeated chemical stress relaxation measurements were carried out to observe the relaxation behaviors at large deformation. It was found that the repeated chemical stress relaxation curves were affected by both temperature measured and extension ratio of rubber. It was suggested from the results obtained that temperature and mechanical stimulus have a similar effect on the stress relaxation curves. Thus we propose the followingArrhenius type eq. [1] for high extension ratios. $${{f(t)} \mathord{\left/ {\vphantom {{f(t)} {f(0)}}} \right. \kern-\nulldelimiterspace} {f(0)}} = \exp (A \cdot e^{\frac{{E_f }}{\alpha }} \cdot t).[1]$$ Where,α is the extension ratio, andA, andE f are the constants determined experimentally. On the other hand, from eq. [1] and usualArrhenius equation, the universal eq. [2] for the extension ratio and the temperature in large deformation was derived as follows, $$\begin{gathered} \ln \{ (\ln f(0)/f(t))/t\} - E/R(1/T_0 - 1/T) \hfill \\ = \ln A - E_f /\alpha [2] \hfill \\ \end{gathered} $$ where,T 0 is adequate temperature. The curves obtained for different temperatures and extensions were very well consistent with those by eq. [2] in large deformation.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01520865
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  • 2
    Digitale Medien
    Digitale Medien
    Effect of polydispersity in polystyrene on stress relaxation (1960)
    Hoboken, NJ : Wiley-Blackwell
    Journal of Polymer Science 47 (1960), S. 55-64 
    Details
    ISSN: 0022-3832
    Schlagwort(e): Chemistry ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie , Physik
    Notizen: Stress relaxation master curves are presented for twenty-three polystyrene samples whose weight-average molecular weights Mw varied from 20,800 to 310,000 and whose heterogeneity indices varied from 1.0 to 15.92. The maximum relaxation times τm, the associated partial modulus Em, and the flow viscosity η were determined for these samples at 115°C. It is shown that at 115°C. the relation log τm (minutes) = -15.10 + 3.4 Mw is obeyed. It is also shown that the quantity αB = τmEm/η correlates with the heterogeneity index of the sample. It is concluded that stress relaxation studies can be used to obtain weight-average molecular weights and also to provide a qualitative measure of the heterogeneity index.
    Zusätzliches Material: 10 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/pol.1960.1204714906
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  • 3
    Digitale Medien
    Digitale Medien
    Einfluß der Mastikation auf die Gistallinität von Gummi. I. Über die röntgenographisch bestimmte Kristallinität von Naturkautschuk (1964)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 76 (1964), S. 232-232 
    Details
    ISSN: 0025-116X
    Schlagwort(e): Chemistry ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie , Physik
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/macp.1964.020760121
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  • 4
    Digitale Medien
    Digitale Medien
    Criterion of polydispersity from the relaxation spectrum (1961)
    Hoboken, NJ : Wiley-Blackwell
    Journal of Polymer Science 51 (1961), S. S29 
    Details
    ISSN: 0022-3832
    Schlagwort(e): Chemistry ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie , Physik
    Zusätzliches Material: 3 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/pol.1961.1205115624
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  • 5
    Digitale Medien
    Digitale Medien
    New method of measuring molecular weight of polymers by procedure X (1961)
    Hoboken, NJ : Wiley-Blackwell
    Journal of Polymer Science 50 (1961), S. S14 
    Details
    ISSN: 0022-3832
    Schlagwort(e): Chemistry ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie , Physik
    Zusätzliches Material: 1 Tab.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/pol.1961.1205015331
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  • 6
    Digitale Medien
    Digitale Medien
    Kinetics of radiation-induced grafting reactions. I. Polyethylene-styrene systems (1972)
    New York : Wiley-Blackwell
    Journal of Polymer Science Part A-1: Polymer Chemistry 10 (1972), S. 259-273 
    Details
    ISSN: 0449-296X
    Schlagwort(e): Physics ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: By means of bromine labeling and ESR, the grafting reactions of styrene onto preirradiated polyethylene have been investigated. Not all the radicals produced by irradiations participate in grafting reactions all together, but they are rendered active bit by bit by the swelling of crystalline parts of polyethylene. The growing rates for polystyryl graft chains at 20°C decrease from 4 monomer units/active site/sec to one-fourth the initial value after 100 min. On the contrary, the average lifetimes increase from 〈103 sec to 〉2.6 × 103 sec. The number-average molecular weight of graft chains also increases with reaction times and rises to 3.5 × 105 after 90 min at 20°C.
    Zusätzliches Material: 15 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/pol.1972.150100123
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  • 7
    Digitale Medien
    Digitale Medien
    Kinetics of radiation-induced grafting reactions. II. Cellulose acetate-styrene systems (1973)
    New York : Wiley-Blackwell
    Journal of Polymer Science: Polymer Chemistry Edition 11 (1973), S. 2547-2556 
    Details
    ISSN: 0360-6376
    Schlagwort(e): Physics ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: Kinetics of grafting reactions of styrene to preirradiated cellulose acetate have been studied by labeling the active sites with bromine atoms. The dilution of styrene monomer with methanol affected grafting reactions remarkedly: e.g., as the concentration of methanol in monomer solutions increased, the growth rates of individual graft radicals decreased while the average lifetimes increased. The integrated amounts of active sites which participated in grafting reactions were also affected by the constitution of monomer solutions and varied roughly in proportion to the extents of swelling of cellulose acetate. Grafting yields for styrene/methanol = 1/1 were higher than for 3/1 and 1/3 throughout the duration of grafting reactions, which is due not only to the high molecular weight of graft chains but also to the large number of graft chains for the 1/1 system compared to the other systems.
    Zusätzliches Material: 10 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/pol.1973.170111010
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  • 8
    Digitale Medien
    Digitale Medien
    Kinetics of radiation-induced grafting reactions. II. Cellulose acetate-styrene systems (1974)
    New York : Wiley-Blackwell
    Journal of Polymer Science: Polymer Chemistry Edition 12 (1974), S. 1581-1581 
    Details
    ISSN: 0360-6376
    Schlagwort(e): Physics ; 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.1974.170120722
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