Optimized Synthesis According to One-Step Process of a Biobased Thermoplastic Polyacetal Derived from Isosorbide
Résumé
This paper describes both the synthesis and characterization of a biobased and non-aromatic polyacetal produced from the reaction between isosorbide and methylene chloride. The reaction was conducted in an aprotic dipolar and harmless solvent using a one-step, fast and economical procedure. The chemical composition of this polymer was investigated using Nuclear Magnetic Resonance and Fourier Transform Infra-Red spectroscopies. The molecular weights were examined by size exclusion chromatography and MALDI-TOF spectrometry. The synthesis conditions (concentration, mixing speed, solvent nature, stoichiometry, addition mode of one reactan) were found to strongly influence both polymer architecture and reaction yield. Under moderated stirring conditions, the polyacetal was characterized by a larger amount of macro-cycles. Inversely, under higher intensity mixing and with an excess of methylene chloride, it was mainly composed of linear chains. In this latter case, the polymeric material presented an amorphous morphology with a glass transition temperature (Tg) close to 55 °C. Its degradation temperature was evaluated to be close to 215 °C using thermogravimetry according to multi-ramp methodology. The chemical approach and the physicochemical properties are valuable in comparison with that characteristic of other isosorbide-based polyacetals.
Mots clés
Degradation temperatures
Acetal resins
Polymers
Polymeric glass
Nuclear magnetic resonance spectroscopy
Mixing
Glass transition
Dichloromethane
Chromatography
Size exclusion chromatography
Fourier transform infra reds
Isosorbide
MALDI-TOF spectrometries
Synthesis optimization
Synthesis and characterizations
Physicochemical property
Biosourced polymers
Thermogravimetric analysis
Plastic products
isosorbide
biosourced polymer
polyacetal
synthesis optimization
physicochemical properties
spectroscopies
cyclic/linear architectures
Spectroscopy
Chlorine compounds
Origine : Publication financée par une institution
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