Synthesis and characterization of polycarbodiimides by MALDI-TOF MS and NMR spectroscopy: kinetic and mechanism study

Matrix-assisted laser desorption/ionization time of flight mass spectrometry and nuclear magnetic resonance spectrometry techniques have been used to characterize carbodiimide oligomers and to identify the reaction intermediate that demonstrates the original synthetic route. The isomerization of the...

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Bibliographic Details
Published in:Polymer bulletin (Berlin, Germany) Germany), 2018-06, Vol.75 (6), p.2657-2670
Main Authors: Garcia, Albert Morell, Cabello, Francisco Medina, Nogués, Antonio Torrelles
Format: Article
Language:English
Subjects:
Catalysts
Characterization and Evaluation of Materials
Chemistry
Chemistry and Materials Science
Complex Fluids and Microfluidics
Isomerization
Mass spectrometry
Molecular structure
Molecular weight
NMR spectroscopy
Oligomers
Organic Chemistry
Original Paper
Phosphorus
Physical Chemistry
Polycarbodiimides
Polymer Sciences
Potassium
Reaction intermediates
Soft and Granular Matter
Synthesis
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Description
Summary:Matrix-assisted laser desorption/ionization time of flight mass spectrometry and nuclear magnetic resonance spectrometry techniques have been used to characterize carbodiimide oligomers and to identify the reaction intermediate that demonstrates the original synthetic route. The isomerization of the catalyst during the kinetic mechanism of the reaction has been also studied. The number of different isomerization species of the catalysts and the dose of catalysts added during the reaction are responsible for the final molecular weight and structure of the oligomer (linear and branched structures). The study shows that controlling the correct catalyst isomerization reaction can decrease the reaction time by up to 5 h and control the synthesis of linear or branched oligomer structures.
ISSN:0170-0839
1436-2449
DOI:10.1007/s00289-017-2175-z