Study of Thermal Aging of Model Compounds Present in Asphalt Cement by GC/MS, ESI-MS, NMR, and FTIR

To find the effects of cross-linker phenol-formaldehyde (PF) resin on the performance of soy-based adhesives, the reaction between model compounds hydroxymethyl phenol (HPF) and glutamic acid were studied in this paper. HPF prepared in laboratory conditions showed higher content of hydroxymethyl groups than normal PF resin, which was proved by the results of Electrospray Ionization Mass Spectrometry (ESI-MS) and 13C Nuclear Magnetic Resonance (13C-NMR). The results of ESI-MS, Fourier transform infrared spectroscopy (FT-IR), and 13C-NMR based on resultant products obtained from model compounds showed better water resistance of the soy protein-based adhesive modified by PF-based resin, which indicated the reaction between PF resin and soy protein. However, it seemed that the soy-based adhesive cross-linked by HPF with the maximum content of hydroxymethyl groups did not show the best water resistance.

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Thermal Aging of Anions in Ionic Liquids containing Lithium Salts by IC/ESI-MS

Electrochimica Acta ◽

10.1016/j.electacta.2014.03.033 ◽

2014 ◽

Vol 130 ◽

pp. 426-430 ◽

Cited By ~ 19

Author(s):

Marcelina Pyschik ◽

Vadim Kraft ◽

Stefano Passerini ◽

Martin Winter ◽

Sascha Nowak

Keyword(s):

Ionic Liquids ◽

Thermal Aging ◽

Lithium Salts ◽

Esi Ms

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Degradation of Poly(methyl methacrylate) Model Compounds at Constant Elevated Temperature Studied via High Resolution Electrospray Ionization Mass Spectrometry (ESI-MS)

Macromolecular Rapid Communications ◽

10.1002/marc.200700330 ◽

2007 ◽

Vol 28 (16) ◽

pp. 1593-1600 ◽

Cited By ~ 27

Author(s):

Francesca Bennet ◽

Tara M. Lovestead ◽

Philip J. Barker ◽

Thomas P. Davis ◽

Martina H. Stenzel ◽

...

Keyword(s):

Mass Spectrometry ◽

Elevated Temperature ◽

High Resolution ◽

Methyl Methacrylate ◽

Electrospray Ionization ◽

Electrospray Ionization Mass Spectrometry ◽

Ionization Mass Spectrometry ◽

Ionization Mass ◽

Model Compounds ◽

Esi Ms

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Glycerol-ω-hydroxyacid-ferulic acid oligomers in cork suberin structure

Holzforschung ◽

10.1515/hf.2006.028 ◽

2006 ◽

Vol 60 (2) ◽

pp. 171-177 ◽

Cited By ~ 19

Author(s):

Sara Santos ◽

José Graça

Keyword(s):

Ferulic Acid ◽

Cell Walls ◽

Cross Linking ◽

Macromolecular Structure ◽

Acid Moiety ◽

Model Compounds ◽

Esi Ms ◽

Important Constituent

Abstract Cork suberin was partially depolymerised by methanolysis catalysed by Ca(OH)2. The solubilised depolymerisate was analysed by ESI-MS/MS. The compounds identified included monomers and “dimeric” and “trimeric” oligomers. Among the latter, an oligomer of glycerol esterified to a ω-hydroxyacid esterified to ferulic acid was identified. The “dimeric” structures of glycerol esterified to a ω-hydroxyacid and of a ω-hydroxyacid esterified to ferulic acid were also found in the partially depolymerised fraction. The identification of these molecules was confirmed by synthesis of model compounds and comparison of their ESI-MS/MS spectra. The glycerol-ω-hydroxyacid-ferulic acid trimeric oligomer could be an important constituent block in the suberin structure. Its function is probably to link the two main polymers present in suberised cell walls, namely, polyaliphatic polyesters and lignin-related polyaromatics. The glycerol-ω-hydroxyacid moiety is part of the polyaliphatic polyester and the ferulic acid moiety is esterified to the polyaromatics. These oligomers provide a new insight to understanding of the macromolecular structure of suberin, since they could allow cross-linking of the two structurally different biopolymers.

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