Basic physical properties/structure of polystyrene-polyisobutylene-polystyrene triblock copolymers
- Polysar Rubber Corp., Ontario, (Canada)
Polystyrene-b-polyisobutylene-b-polystyrene (PSt-PIB-PSt) triblock copolymers, with various molecular architectures, have been synthesized to establish basic physical properties/structure correlations for this novel thermoplastics elastomer (TPE). The test results have confirmed that these triblock copolymers have a unique combination of physical properties which is currently unavailable on the TPE market. The fully saturated character of the PIB backbone provides excellent ozone resistance. Barrier, electrical, and low-temperature properties, were measured, and found to be equivalent to those of conventional butyl vulcanizates. The low initial modules of PIB, and the fact that the PSt content can be kept low without significant loss in tensile properties, renders the material soft. The high incompatibility of PIB and PSt allows the overall chain length and, therefore, the melt viscosity, to be kept low. This could bring an important advantage, in processing, over other TPE`s. The combination of the above properties, and the inherent properties of PIB, makes this material in excellent candidate for wire and cable coating, seal and gasket, adhesive and vibration damping applications.
- OSTI ID:
- 141951
- Report Number(s):
- CONF-930304-; TRN: 93:003688-1640
- Resource Relation:
- Conference: 205. American Chemical Society national meeting, Denver, CO (United States), 28 Mar - 2 Apr 1993; Other Information: PBD: 1993; Related Information: Is Part Of 205th ACS national meeting; PB: 1951 p.
- Country of Publication:
- United States
- Language:
- English
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