ACCESSIBILITY OF THE FUNCTIONAL GROUPS OF CHITOSAN AEROGEL PROBED BY FT-IR-MONITORED DEUTERATION

Romain Valentin (1, 2) , Barbara Bonelli (2) , Edoardo Garrone (2) , Francesco Di Renzo (1) , Françoise Quignard (1)

1 ICGM ICMMM - Institut Charles Gerhardt Montpellier - Institut de Chimie Moléculaire et des Matériaux de Montpellier
2 Dipartimento di Scienza dei Materiali e Ingegneria Chimica

Transmission FT-IR spectroscopy allowed to monitor the deuteration of wafers of chitosan aerogel and xerogel by D2O vapor at room temperature. The complete deuteration of the alcohol and amine groups of the aerogel (surface area 175 m2 g-1 as measured by N2 volumetry) confirmed the high accessibility of the functional groups of the polymer. The xerogel (surface area 5 m2 g-1) was only partially deuterated in more severe conditions. The isotopic shift of the deuterated groups allowed to confirm or revise some attributions of infrared bands of chitosan.

Mots clés: chitosan; polysaccharide; aerogel; supercritical drying; FT-IR spectroscopy; probe molecule; D2O; N2 adsorption

Domaines: Matériaux; Polymères

Romain Valentin, Barbara Bonelli, Edoardo Garrone, Francesco Di Renzo, Françoise Quignard. ACCESSIBILITY OF THE FUNCTIONAL GROUPS OF CHITOSAN AEROGEL PROBED BY FT-IR-MONITORED DEUTERATION. Biomacromolecules, 2007, 8 (12), pp.3646-3650. ⟨10.1021/bm070391a⟩. ⟨hal-00186708⟩