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| Titel: |
Stress-Strain Characteristics and Ultimate Strength Properties of the SBS-Type Block Copolymer at Temperature Below and a Little Above the Tg of Polystyrene Blocksf |
| Auteur: |
Vinogradov, G. V. Dreval, V. E. Borisenkova, E. K. Kurbanaliev, M. K. |
| Verschenen in: |
International journal of polymeric materials |
| Paginering: | Jaargang 9 (1982) nr. 2 pagina's 105-113 |
| Jaar: |
1982-04-01 |
| Inhoud: |
The paper presents a summary of the results of study into the stress-strain relationship and ultimate strength characteristics of a SBS block copolymer (Cariflex TR-1200). The polymer has been investigated at uniaxial extension in the range of temperature from 20 up to 90 C. Two types of the stress-strain curves have been observed: S-shaped and the curves with a maximum corresponding to necking. The stress dependence on strain and lime can be factored as σ(ε, t) = h(ε) G(t). Viscosity has been measured. There exists a yield value of the stress above which it can be registered rather strong fall of viscosity. The yield value increases with decrease of temperature that is attributed to difficulties of break-down of the copolymer structure as temperature decreases. The long term durability of the block copolymer varies following a pattern typical of cured rubbers. The formation of specimens from solutions in various solvents may perceptibly affect this pattern, whereby the long term durability and the associated ultimate strength may change three- to ten-fold. These findings are ascribed to variations in the two-phase structure of the block copolymer due to conditions of its formation. |
| Uitgever: |
Taylor & Francis |
| Bronbestand: |
Elektronische Wetenschappelijke Tijdschriften |
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