Identification Characteristics for Amber and its Imitation

DOI

10.2991/icimm-15.2015.91How to use a DOI?

Keywords

amber; imitation; infrared absorption spectrum; thermal analysis; identify

Abstract

Amber, copal resin and anime belong to the natural resin formed in different geologic age, which are similar and transitional in the physical and chemical properties. The artificial heat- pressurized treatment copal, synthetic resin, pressing amber and covering film amber are similar to amber in the gemological parameters. It is very difficult to identify amber from these imitation only based on the gemological parameters. In this paper, amber and its imitation samples were tested by means of Fourier transform infrared spectroscopy (FTIR) and Differential scanning calorimetry (DSC) to explore the attribution of peaks so as to obtain the difference between the amber and its imitation. The results show that the difference of infrared spectra between amber and natural resin is that the amber has characteristic absorption peaks of aliphatic structure, while natural resins such as copal resin and anime have a weak absorption band at 3073 cm-1 caused by telescopic vibration of (CH), absorption band at 1641cm-1 caused by telescopic vibration of (C C), and absorption band at 888 cm-1 caused by bending vibration of (CH) for benzene ring. The infrared spectras between the amber and the synthetic resin indicate that there are great differences between 2800-3000 cm-1 and 500-1500 cm-1; and I (2933cm-1) /I (1725cm-1) of infrared spectrum for pressed amber is about 1.5, while I (2934cm-1)/I (1725cm-1 ) of amber is about 3.0. The DSC thermogram for the heat pressurized treatment copal resin only exists exothermic peak and its evident exothermic peak is at about 150 , which there is evident difference from the endothermic peak for the amber.

Copyright

© 2015, the Authors. Published by Atlantis Press.

Open Access

This is an open access article distributed under the CC BY-NC license (http://creativecommons.org/licenses/by-nc/4.0/).

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TY  - CONF
AU  - Hui Li
AU  - Xuan Wang
AU  - Yong Zhu
PY  - 2015/07
DA  - 2015/07
TI  - Identification Characteristics for Amber and its Imitation
BT  - Proceedings of the 5th International Conference on Information Engineering for Mechanics and Materials
PB  - Atlantis Press
SP  - 483
EP  - 488
SN  - 2352-5401
UR  - https://doi.org/10.2991/icimm-15.2015.91
DO  - 10.2991/icimm-15.2015.91
ID  - Li2015/07
ER  -