Interactions in blends containing chitosan with functionalized polymers

Abstract

ABSTRACT:The phase behavior of blends containing chitosan with poly(vinyl-alcohol) (PVA) and poly(2-hidroxyethyl methacrylate) (P2HEM) was analyzed. Blends were obtained by casting from acetic acid solution (HAc) and 1,1,1,3,3,3 hexafluoro-2-propanol (HF2P) and studied by DSC, FT-IR, and TGA. The phase behavior of the blends of chitosan with PVA and P2HEM, studied by DSC, shows that the systems behave as one-phase systems in HAc as well as in HF2P according to the DSC results. According to the results of FT-IR analyses of the different absorptions of the blends, relative to the pure components, they show an important shift that is considered evidence of an interaction between the components of the blends. The thermogravimetric analysis of the blends and the pure components shows that the temperature for thermal degradation of the blends is higher that that of the pure components, irrespective of the solvent casting from which the mixture was obtained. These results are interpreted as the formation of a new product that corresponds to a compatible polymer blend. The compatibilization of these systems is attributed to strong interactions, like hydrogen bonds formation between the functionalized polymers and chitosan, due to the presence of interacting functional groups in all the polymers studied.

Characterization and cytotoxic activity of sulfated derivatives of polysaccharides from Agaricus brasiliensis

“…Hong and Choi [28] found a similar profile for a polysaccharide-protein complex isolated from A. blazei fruiting body. A similar behavior has been described for other polysaccharides such as chitosan [30] and galactomannan [31]. Jayakumar et al [32] also reported a slight decrease in the thermostability of chitin after sulfation.…”

Preparation of single or double-network chitosan/poly(vinyl alcohol) gel films through selectively cross-linking method

“…One of the hot and controversial topics about this system is its compatibility, which is closely relevant to the extent of polymer-polymer interactions. Strong evidences from accurate measurements have shown that this system is not fully miscible at molecular level, depending on the preparation processing and/or the fraction of a certain composition (Castro, Gargallo, Leiva, & Radic, 2005;Jawalkar, Raju, Halligudi, Sairam, & Aminabhavi, 2007;Nakano et al, 2007;Sandoval, Castro, Gargallo, Radic, & Freire, 2005). This special behavior of chitosan/PVA blend arises from the weak interaction between PVA and chitosan as a result of their tight intramolecular structure.…”

Microstructure and Molecular Interaction in Glycerol Plasticized Chitosan/Poly(vinyl alcohol) Blending Films

“…[12,13] One of the hot and also controversial topics about this blend is their miscibility. [14][15][16][17][18][19][20] Strong evidence from some accurate measurements has shown that CS/PVA blend is not fully miscible at molecular level. The miscibility between CS and PVA in the blend was observed to depend on the preparation processing and the relative content of CS and PVA components.…”

“…The miscibility between CS and PVA in the blend was observed to depend on the preparation processing and the relative content of CS and PVA components. [11,14,[15][16][17] This special behavior of CS/ PVA blend was partly contributed to the weak intermolecular interaction between PVA and CS because of their tight intramolecular structure. [15] It is well known that the chemical nature of side chains of vinyl polymers usually acts as the main factor in their miscibility behaviors.…”