Coupling between a percolative conductor--insulator phase transition and an amorphous--semicrystalline polymer phase transition
Abstract
We have experimentally studied a disordered conductor--insulator composite of carbon-black particles and a semicrystalline polymer. At room temperature this system undergoes a percolative phase transition from an electrically insulating phase to an electrically conducting phase as the volume fraction of carbon-black is increased. The effective percolation threshold at room temperature shifts significantly when these composites are prepared by cooling at different rates through the amorphous to semicrystalline polymer phase transition. This shift in effective percolation threshold can be explained by changes in the percent crystallinity of the polymer at room temperature, combined with exclusion of the carbon-black particles from the crystalline regions.
- Publication:
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APS March Meeting Abstracts
- Pub Date:
- March 1997
- Bibcode:
- 1997APS..MAR.M1606H