Thermal decomposition of surfactants in PTFE-dispersions

Holze, Rudolf; Riga, Alan T.; Yeager, Ernest

doi:10.1007/bf01730102

Cited by 3 publications

(1 citation statement)

References 9 publications

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“…Mori et al [6] studied the influence of temperature from 320-370~ in air, and observed the increase of the acid absorption capability of the catalyst layer below 350 ~ They concluded that the residues of Triton X-100 enhanced acid absorption. Holtz et al [7] also gave warnings on surfactant remaining. They decom-~ posed Triton X-100 absorbed on various ca.rbon powders at higher temperatures, observed exothermic heat ,during Triton X-100 decomposition from 3007500 ~ and concluded that the surfactant remains up to 400~ We also studied the thermal bebaviour of Triton X-100 with differential scanning calorimetry (DSC) and infrared (i.r.)…”

Section: Introductionmentioning

confidence: 94%

Influence of the temperature of heat treatment on phosphoric acid fuel cell cathodes

et al. 1991

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The thermal behaviour of electrode materials during heat treatment from 250-400 ~ was studied. The cathode performance changed by two steps depending on temperature of the heat treatment. At the first step (300 320 ~ polytetrafluoroethylene (PTFE) melted unexpectedly, giving hydrophobic character to the catalyst layer. This change drastically improved the cathode performance. At the second step (340-400 ~ support carbon was oxidized by catalytic action of platinum, increasing the PTFE content from 45 to 83 wt%. This caused a gradual decline in the cathode performance. The poor cell performance of the electrode treated below 300~ is due to the fact that PTFE is not melted at that temperature. Triton X-100 used as a surfactant in the PTFE dispersion disappeared completely from the electrode at these temperatures by oxidation, catalysed by platinum.

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Section: Introductionmentioning

confidence: 94%