A calorimetry investigation of glass temperature and fragility of ancient ambers from Texas and Canada

A calorimetry investigation of glass temperature and fragility of ancient ambers from Texas and Canada
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对德克萨斯州和加拿大古代琥珀的玻璃温度和脆性进行量热研究

DOI:
10.1016/j.jnoncrysol.2019.119549
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发表时间:
2019
影响因子:
3.5
通讯作者:
McKenna, Gregory B.
McKenna, Gregory B.
中科院分区:
材料科学2区
文献类型:
--
作者:
Cheng, Sixue;Friedman, Virginia;McKenna, Gregory B.

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在该实验室之前的工作中,据报道,一系列琥珀的玻璃化转变温度 (Tg) - 脆性 (m) 或表观活化能 (Eg) 能量相关性与芳香族合成聚合物的行为相似。在目前的工作中,我们扩大了琥珀的研究范围,包括最近才发现和/或化学分类的三种德克萨斯琥珀和三种加拿大琥珀。与之前的数据进行比较后,我们发现德克萨斯琥珀的结果与之前发现的脆性和活化能与玻璃化转变温度的相关性相同。另一方面,加拿大琥珀表现出非常不同的行为,反映在玻璃化转变温度下非常高的脆性和活化能。我们认为,这一观察结果与所研究的加拿大琥珀的聚合物结构中独特的交联结构或其他细微的化学差异有关。
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 theTg.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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