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Synergistic action of fluorine-containing additives in bromine/antimony fire retardant ABS

Synergistic action of fluorine-containing additives in bromine/antimony fire retardant ABS. Ali DURAN POLYMER TECHNOLOGY SEMINER. RESULTS AND DISCUSSION.

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Synergistic action of fluorine-containing additives in bromine/antimony fire retardant ABS

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  1. Synergistic action of fluorine-containing additives in bromine/antimony fire retardant ABS Ali DURAN POLYMER TECHNOLOGY SEMINER

  2. RESULTS AND DISCUSSION • The effect of PTFE is quite evident at oxygen concentrations 23-26%, where the slope of the curve is large, whereas it tends to vanish if combustion is carried out in any oxygen excess above 27%, • The effect of SbF3 on combustion rate is similar to that of PTFE and does not seem to depend on its concentration,

  3. RESULTS AND DISCUSSION • As far as the combustion times are concerned, the results presented in fig. 2 again show the similarity between the effect of PTFE and that of SbF3 at relatively high concentration vs. the combustion time (SQT) of FR ABS, • In both cases the initial instability of the flame in FR ABS shown by the low increase of SQT with O2 increase (22-25%), • However, FR ABS exceeds the limiting combustion rate already at O2concentration of 23.5%, shown in fig. 1,

  4. RESULTS AND DISCUSSION • FR ABS with very low concentration of SbF3 shows a trend qualitatively similar to that of PTFE or 0.2 phr SbF3containing FRABS, • Moreover, in tis case, the intermediate unstable flame regime is reached at larger SQT (> 180 S.), • Because of the parallel behaviour of PTFE and SbF3 might be one of the truly active fire retardant agents, • In its presence the combustion proceeds at a very low rate but the extinguishment of the flame is rather delayed, • In forced combustion conditions the additional effect of the fluorine containing compound is no longer sagnificiant and the fire retardance is restricted to that of the synergic Br/Sb system,

  5. RESULTS AND DISCUSSION • In fig. 3 the TG of ABS, FR ABS and PTFE-containing FR ABS are reported together with the calculated TG for the FR ABS system assuming no interaction occuring amongst the components, • By comparing the experimental and calculated TG of FR ABS, the role played by the polymer in the thermal behaviour can be deduced because the experimental curve shows a weight loss larger than the calculated one in the BTBPE degredation temperature range (370-390 0C),

  6. RESULTS AND DISCUSSION • Moreover, the amount of char stable at 700 0C is larger than expected for a simple additive behaviour, • Interaction is supposed to take place between the polymer and the FR system and not between the FR components because it has already been reported that BTBPE and Sb2O3 do not react at relatively low heating rate,

  7. CONCLUSION • It has been shown that the effect of SbF3 on combustion of FR ABS is parallel to that of PTFE reducing the rate of combustion of ABS in mild combustion conditions, • Furthermore, both compounds induce crosslinking in ABS on heating, • Thus, it is likely that SbF3 or (SbF5) created in situ could be responsible for the effect of PTFE on the combustion of ABS fire retarded with the Br/Sb system, • However further work is necessary to understand the mechanism of the fire retardant action.

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