Abstract
In prior work from this lab it was reported that the glass transition temperature (Tg) -fragility (m) or apparent activation (Eg) energy correlation for a series of ambers was similar to the behavior of aromatic synthetic polymers. In the present work we have broadened the range of ambers studied to include three Texas ambers and three Canadian ambers that have only recently been discovered and/or chemically classified. Upon comparison with the prior data, we find that the results for the Texas ambers fall within the same correlation of fragility and activation energy with glass transition temperature as was found previously. On the other hand, the Canadian ambers exhibit a very different behavior as reflected in very high fragility and activation energy at the Tg. We propose that, the observation is related to the unique crosslinking structure or other subtle chemistry differences in the polymer structure of the studied Canadian ambers.
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