ORCID Profile
0000-0001-9048-0842
Current Organisation
CNRS
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Publisher: Elsevier BV
Date: 02-2015
DOI: 10.1016/J.CARBPOL.2014.04.083
Abstract: Conventional heating and microwave irradiation have been compared for the synthesis of chitosans grafted with alkyl chains. Reaction time (1-60 min), temperature (25 and 40 °C) and chitosan molar mass have been studied onto the yield of alkylation. The irradiation mode has been scrupulously controlled to highlight the effect of the use of microwaves. The chemical structure of modified polymers (degree of alkylation) is determined from NMR. In relation to the rheological behavior and surface tension measurements, the evolution of hydrophobic interactions is studied as a function of the yield of alkylation. A maximum of intrinsic viscosity and hydrodynamic diameter was observed for a degree of alkylation of around 10%. All the results tend to prove that microwave assisted synthesis is a powerful method to obtain modified chitosan under extremely low reaction time without any degradation and/or property modifications.
Publisher: Wiley
Date: 26-03-2015
Publisher: Royal Society of Chemistry (RSC)
Date: 2017
DOI: 10.1039/C7PY01255A
Abstract: The synthesis of poly(2-ethyl-2-oxazoline) has been developed in an ionic liquid and performed with microwave-assisted or droplet-based millifluidic processes.
Publisher: Walter de Gruyter GmbH
Date: 11-2014
Abstract: Polysaccharides are a natural and renewable feed stock for synthesizing high performance macromolecular materials. However, their structure does not allow reaching all properties required for specific applications and chemical modifications are necessary to reach such objectives. Despite the use of natural polymers, the chemistry and processes employed are not environment-friendly due to the nature of chemicals, solvents or because the conventional chemical process are energy-consuming. On the other hand, microwave assisted processes were developed in organic chemistry since the 1980s and more recently for polymer chemistry (polymer formation and modification). Within the chemistry of natural polymers, the use of microwave irradiation has been exploited in the past two decades to alleviate limitations in the synthesis of graft modified polysaccharide materials. Microwave heating is described as more homogeneous, selective and efficient as compared to conventional heating resulting in faster reactions with fewer or no side products as ex le. Different results reported within the recent literature will be discussed considering the role of microwave irradiation and its consequence on the reaction parameters and properties of final materials. Grafting of polysaccharides, specific modification of polysaccharides or fibers particularly for preparing smart textiles or medical products as well as reactions of polysaccharides to valuable bio-platform molecule will be discussed.
Publisher: Elsevier BV
Date: 3
Publisher: Wiley
Date: 10-09-2018
Publisher: American Chemical Society (ACS)
Date: 20-08-2021
Publisher: Elsevier BV
Date: 03-2017
Publisher: Wiley
Date: 10-2015
No related grants have been discovered for stephanie reynaud.