XRD pattern of chitin based polyurethane bio-nanocomposites

Synthesis of chitin–bentonite clay based polyurethane bio-nanocomposites

“…The clay dispersion within chitin has been characterized by both XRD [24] and optical microscopy (OM), which are the most frequently, used and approachable methods to study the structure of nanocomposites. It is difficult, however, to draw definitive conclusions on the microstructure of the nanocomposites from XRD [24] patterns exhibiting diffraction patterns, as the relatively featureless diffraction pattern of the exfoliated structure may have been covered up by the diffraction peak of the intercalated structure [25]. Therefore optical microscopy (OM) is necessary to determine the nature of the nanocomposites and to provide additional information that will be helpful in the interpretation of the XRD results.…”

Swelling, mechanical and mucoadhesion properties of Mt/starch-g-PMAA nanocomposite hydrogels

“…Recent examples of modified drug delivery systems based on CPN include intercalation of Mt particles in poly(D,L-lactide-co-glycolide) or poly(lactide) (Dong and Feng, 2005;Campbell et al, 2008;Feng et al, 2009). Natural polysaccharides and their grafted derivatives such as, chitosan, sodium alginate and starch have also been used to prepare clay mineral-biopolymer nanocomposites (Zia et al, 2010).…”

Cytotoxicity and mechanical behavior of chitin–bentonite clay based polyurethane bio-nanocomposites

“…The existence of the intercalated clay by PU in the hybrid was confirmed by OM [21], as OM is necessary to determine the nature of the nanocomposites and to provide additional information that will be helpful in the interpretation of the results. It is obvious from the results of OM photographs that bentonite nanoclay is fully dispersed in all the prepared samples and presence of the clay contents is clearly visible on the surface of the samples.…”

“…2(a) and (b) that both the spectra have shown almost a complete set of peaks at the same positions. Furthermore, it was observed that the intensity of hydrogen-bonded-NH increased as the chitin content increased, suggesting that the hydrogen bonds of chitin were broken and new hydrogen bonds between chitin and NCO terminated PU prepolymer were formed [21]. Based on these results of FT-IR spectrum, it was thought that chitin had already effectively crosslinked with polyurethane, which greatly affected on the properties of the PU bio-nanocomposites.…”

“…In its continuation, the present article reports the effect of diisocyanate structure on the biocompatibility and mechanical behavior of chitin-based polyurethane elastomers. Synthesis and XRD properties of chitin based polyurethane bionanocomposites have also been reported and discussed [21,22]. Considering versatile properties of PU and wound healing properties of the chitin, it is considered that resulting product will be proved to be suitable candidate for biomedical implants.…”