Preparation and characterization of biodegradable poly(l-lactide)/chitosan blends

In this article, we report the synthesis of crosslinked chitosan using 8 MeV electron beam (EB) irradiation in the presence of carbon tetrachloride. The crosslinked chitosan is characterized by dissolution, Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), scanning electron microscopy (SEM), differential scanning colorimetry (DSC), and nanoindentation studies. The insolubility of irradiated films in acetic acid indicates that chitosan has undergone crosslinking reaction. FTIR analysis also confirms the crosslinked structure of chitosan. Mechanical properties such as elastic modulus and hardness are calculated from the nanoindentation data. Modulus and hardness of chitosan increase with increase in the irradiation dose due to the increase in the crosslinking.

Section: Resultsmentioning

confidence: 99%

Preparation of crosslinked chitosan by electron beam irradiation in the presence of CCl₄

Ramaprasad

Rao

Manimunda

et al. 2008

“…However, these films are microcomposite films, which may give nonconsistent properties. Chen et al 13 have prepared chitosan/polylactide miscible blends by using acetic acid-DMSO as mixture solvent and found intermolecular bonds existing between chitosan and polylactide. Poly(ethylene glycol) (PEG) and methoxy poly(ethylene glycol) (MPEG) are water-soluble biocompatible polymers with different molecular weights.…”

Section: Introductionmentioning

confidence: 99%

Preparation and characterization of biodegradable chitosan and methoxy poly(ethylene glycol)‐b‐poly (ε‐caprolactone) blend homogeneous films

Niamsa

Puntumchai

Sutthikhum

et al. 2008

Blend homogeneous films of chitosan and water-soluble methoxy poly(ethylene glycol)-b-poly(e-caprolactone) (MPEG-b-PCL) diblock copolymer with different blend ratios were prepared by aqueous solution blending method. The water-soluble MPEG-b-PCL was synthesized using MPEG with molecular weight of 5000 g/mol and stannous octoate as the initiating system. The molecular weight of MPEG-b-PCL obtained from 1 H-NMR was 5800 g/mol. FTIR spectra of the blend films showed that there were intermolecular bonds between chitosan and MPEG-b-PCL. Thermal properties of the blend films strongly depended on the blend ratios. Scanning electron micrographs indicated that the blend films were homogeneous films. However, roughness of the blend films increased whereas transparency and moisture uptake decreased upon increasing the MPEG-b-PCL blend ratios.

“…7 Chitosan has a high modulus of elasticity, owing to the higher glass transition temperature and crystallinity. 8,9 Natural rubber (NR), cis-1,4-polyisoprene (Fig. 2), occurs in several plant species, but its most important source is the ''Hevea brasiliensis'' tree, which accounts for over 99% of the world's natural rubber production.…”

Section: Introductionmentioning

confidence: 99%

Mechanical properties of thermoplastic elastomeric blends of chitosan and natural rubber latex

Rao

Johns

2007

Thermoplastic chitosan/natural rubber blends (Cs/NR) were prepared from natural rubber latex and chitosan by solution casting technique. The blends were characterized by mechanical analysis (stress-strain) and the mechanical properties were found to vary with chitosan/natural rubber ratios. Experimental values were compared with different theoretical models. Effect of thermal aging on mechanical properties was also investigated. Dicumyl peroxide was used as the crosslinking agent. The effect of crosslinking on mechanical properties of Cs/NR has also been studied.