Thermodynamics/hydrodynamics of aqueous polymer solutions and dynamic mechanical characterization of solid films of chitosan, sodium alginate, guar gum, hydroxy ethyl cellulose and hydroxypropyl methylcellulose at different temperatures

Characterization of physical and viscoelastic properties of polymer films for coating applications under different temperature of drying and storage

“…The absolute values measured for both moduli are in the order of magnitude which is typical for these types of polymers. Similar results can be find in literature (Kararli et al, 1990;Mutalik et al, 2006;Okhamafe and York, 1984;Gomez-Carracedo et al, 2003;Aoi et al, 1998) for HPMC and PVA films. Concerning E , Fig.…”

Viscometric study of chitosan solutions in acetic acid/sodium acetate and acetic acid/sodium chloride

“…Therefore, the application of the SC and DC equations for this chitosan in the two solvents systems analyzed is not restricted to this Table 4 Values of K and ˛ found in the literature for the solvent systems CH3COOH 0.3 mol/L/CH3COONa0.2 mol/L (medium 1) and CH3COOH 0.1 mol/L/NaCl 0.2 mol/L (medium 2) (Canella & Garcia, 2001;Campana-Filho et al, 2007;Kassai, 2007;Moura et al, 2011;Mutalik et al, 2006;Qun & Ajun, 2006;Santos et al, 2003).…”

“…(6)). The values of the constants K and f ound in the literature for the solvents used here, at 25 • C, are presented in Table 4 (Campana-Filho et al, 2007;Canella & Garcia, 2001;Kassai, 2007;Moura, Moura, Soares, & Pinto, 2011;Mutalik et al, 2006;Qun & Ajun, 2006;Rinaudo & Domard, 1989;Rinaudo, Milas, & Dung, 1993;Santos, Soares, Dockal, Campana Filho, & Cavalheiro, 2003).…”

Novel cellulose-based polyelectrolytes synthesized via the click reaction

“…To determine the [g] values, the extrapolation of reduced viscosity to zero concentration was performed in a concentration range up to 4 mg/mL in order to minimize the influence of intermolecular interactions. 18 The [g] values were obtained by linear regression. Elemental analysis (C, H, N, S) was carried out on a CHNS analyzer Vario EL III (Elementaranalysensysteme, Hanau, Germany).…”