| Abstract: | The flammability properties of copolyesters and copolycarbonates containing varying percentages of 2-butyne-1,4-diol and 2,4-hexadiyne-1,6-diol were studied by use of oxygen index and dynamic thermogravimetry. The char formation was found to increase with increasing polymer unsaturation. For nonconjugated acetylenes there is an increase in the oxygen index with increasing unsaturation in a polymer. In contrast, conjugated acetylenes dramatically decrease the oxygen index of a polymer system. |
