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

S. Cheng; Virginia Friedman; Gregory B. McKenna

doi:10.1016/j.jnoncrysol.2019.119549

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

S. Cheng, Virginia Friedman, Gregory B. McKenna

Chemical Engineering

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7 Scopus citations

Abstract

In prior work from this lab it was reported that the glass transition temperature (T_g) -fragility (m) or apparent activation (E_g) 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 T_g. 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.

Original language	English
Article number	119549
Journal	Journal of Non-Crystalline Solids
Volume	521
DOIs	https://doi.org/10.1016/j.jnoncrysol.2019.119549
State	Published - Oct 1 2019

Keywords

Amber
Apparent activation energy
Cross-link structure
Dynamic fragility
Glass transition temperature

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10.1016/j.jnoncrysol.2019.119549

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title = "A calorimetry investigation of glass temperature and fragility of ancient ambers from Texas and Canada",

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.",

keywords = "Amber, Apparent activation energy, Cross-link structure, Dynamic fragility, Glass transition temperature",

author = "S. Cheng and Virginia Friedman and McKenna, {Gregory B.}",

note = "Funding Information: The authors are grateful to the National Science Foundation of the United States under grant CMMI-1662046 and the John R. Bradford Endowment at Texas Tech University , each for partial support of the work. We also thank Prof. Sindee L. Simon and Dr. Yung P. Koh for providing help with the DSC measurements and useful discussion on the content of this paper. Special thanks to Jennifer Poulin of the Canadian Conservation Institute, who generously provided the Canadian ambers. Publisher Copyright: {\textcopyright} 2019 Elsevier B.V.",

year = "2019",

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doi = "10.1016/j.jnoncrysol.2019.119549",

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AU - Cheng, S.

AU - Friedman, Virginia

AU - McKenna, Gregory B.

N1 - Funding Information: The authors are grateful to the National Science Foundation of the United States under grant CMMI-1662046 and the John R. Bradford Endowment at Texas Tech University , each for partial support of the work. We also thank Prof. Sindee L. Simon and Dr. Yung P. Koh for providing help with the DSC measurements and useful discussion on the content of this paper. Special thanks to Jennifer Poulin of the Canadian Conservation Institute, who generously provided the Canadian ambers. Publisher Copyright: © 2019 Elsevier B.V.

PY - 2019/10/1

Y1 - 2019/10/1

N2 - 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.

AB - 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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KW - Apparent activation energy

KW - Cross-link structure

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KW - Glass transition temperature

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

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Keywords

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