|
| << vorige |
Tijdschrift beschrijving
Alle jaargangen van het bijbehorende tijdschrift
Alle afleveringen van het bijbehorende jaargang
Alle artikelen van de bijbehorende aflevering
Details van artikel 7 van 7 gevonden artikelen
| Titel: |
The Rheology and Molecular-Mass Characteristics of 1,4-cis-Polyisoprenes and Butyl Rubberst |
| Auteur: |
Vinogradov, G. V. Volfson, S. I. Karp, M. G. |
| Verschenen in: |
International journal of polymeric materials |
| Paginering: | Jaargang 9 (1982) nr. 2 pagina's 87-104 |
| Jaar: |
1982-04-01 |
| Inhoud: |
The interrelationship of the molecular-mass characteristics and the rheological properties of 1,4-cis-polyisoprenes and butyl rubbers has been examined. Commercially produced polymers were subjected to mechanical breakdown (polyisoprenes) and to ozonolytic or catalytic (by AlCl3) degradation (butyl rubbers) until the most probable distribution was attained. The molecular-mass characteristics of the polymers was determined by the GPC method. We have plotted curves showing the dependences of the apparent and complex viscosities on the rate of shear and the frequency, of the storage and loss moduli on the frequency, and of the initial values of viscosity and of the first-normal stress coefficient on the molecular-mass characteristics of the polymers studied. We have obtained the logarithmic relaxation-time H-spectrum from the molecular-mass characteristic on the one hand and from the storage modulus on the other. These two kinds of relaxation-time spectra are in satisfactory agreement with each other. The initial viscosity has been evaluated from the relaxation-time spectra. The data obtained agree well with the experimentally determined values of viscosity. |
| Uitgever: |
Taylor & Francis |
| Bronbestand: |
Elektronische Wetenschappelijke Tijdschriften |
Details van artikel 7 van 7 gevonden artikelen
| << vorige |