Study of blend films from chitosan and hydroxypropyl guar gum

Abstract

ABSTRACT:In this study blend films of chitosan (CH) and hydroxypropyl guar gum (HGG) were prepared using a conventional solvent-casting technique and were dried at room temperature. Their miscibility and other properties were studied by Fourier transform infrared spectroscopy, wide-angle X-ray diffraction, scanning electron microscopy, differential thermal analysis, ultraviolet analysis, and tensile strength tests. The physical and thermal properties of the films depended on the blending ratio. The maximum tensile strength and breaking elongation values achieved were 58.94 MPa and 17.25%, respectively, with a 60% content of HGG. Thermal stability also was improved, and the blend film containing 60% HGG had greater thermal stability than did the other blend and pure CH films. In addition, the best optical transparence was observed from 500 to 800 nm in the blend film containing 60% HGG. The results indicate that intermolecular interactions that resulted from hydrogen bonding between CH and HGG occurred in the blend films.

Synthesis and characterization of membranes obtained by graft copolymerization of 2-hydroxyethyl methacrylate and acrylic acid onto chitosan

“…According to the results obtained at two different frequencies (0.316 and 1 Hz) for M1 the only peak that showed to be frequency dependent was that recognized as the T g (131 • C), as expected since it represents an alfa-relaxation. For that reason, it is assumed that the T g of the chitosan used in this work is 131 • C. The final peak at 300 • C is widely recognized as related to the decomposition temperature (Jiang et al, 1996;Xiao et al, 2003). It starts generally around 230 • C, and can also be confirmed by using the thermogravimetric data published (Liu et al, 2003).…”

Properties of hydroxypropyl guar/TEMPO-oxidized cellulose nanofibrils composite films

“…The decomposition temperature for the composite films, i.e., CF1, CF2 and CF3 were 223, 217 and 210°C, respectively, indicating that the thermal stability of the composite films was increased with the increase of HPG content. The high thermal stability of composites could be attributed to the hydrogen bonds formed between the -OH and -COOgroups of TOCNs and the -OH groups of HPG (Xiao et al 2003).…”

“…And the differences, including band shifts, intensity changes and peak broadening, are derived from chemical interactions (Dong and Ozaki 1997;Xiao et al 2003). Figure 3 shows the IR spectra of HPG, TOCNs and CF2 films.…”

“…It has better water solubility and film forming property than guar gum (Lu et al 2005;Xiao et al 2003) and plays a large role in the various products of chemically modified guar gum (Cheng et al 2002). HPG has been widely used in many industries such as oil recovery, food industry, paints and the formulation of cartridge explosives (Wu et al 2010;Xiao et al 2003).…”

Physical, antibacterial and antioxidant properties of chitosan films incorporated with thyme oil for potential wound healing applications

“…Strong absorption bands centered at 3400 cm -1 were concerned with the stretching vibration of O-H and N-H bonds and those in the region of 1030-1160 cm -1 were assigned to the C-O bonds [13,30]. Furthermore, in the C-H stretch region of FT-IR spectrum, the peak at 2932 cm -1 was assigned to the asymmetric mode of CH 2 [30,31]. The band due to CH 2 scissoring occured at 1466 cm -1 [31].…”