Physical and chemical aspects of biodegradation of natural polymers

Ratajska, M.; Boryniec, S.

doi:10.1016/s1381-5148(98)00031-5

Cited by 36 publications

(15 citation statements)

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“…Recently, polymer blends have received much attention. This is mainly due to the fact that new materials with better physicochemical properties can be observed when the individual components used to blend are compatible [1,2]. Modification of chitosan by blending with other polymeric materials might be of interest for some applications.…”

Section: Introductionmentioning

confidence: 99%

Preparation and Characterization of Chitosan/Agar Blends: Rheological and Thermal Studies

El-Hefian

Nasef

Yahaya

et al. 2010

J. Chil. Chem. Soc.

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In this work, a number of mixture aqueous solutions of chitosan/agar (CS/AG) at different ratios (considering chitosan as the main component) were prepared. The rheological properties i.e. shearing viscosity and shear stress of the blend solutions as a function of shear rate as well as the thermal properties of the blend films were investigated. Among the parameters studied were temperature, shearing time and storage time. Results showed that almost Newtonian behavior was observed at temperatures from 40 o C to 55 o C for the ratios 100/0, 90/10, 80/20 and 70/30. However, the proportions 60/40 and 50/50 showed a clear shear thinning behavior (pseudoplastic non-Newtonian behavior). It was also found that all the blend solutions obeyed the Arrhenius equation. In addition, the effect of shearing time on the shearing viscosity of all blends did not show any significant differences at all shearing times applied in this study except the proportion 50/50 wherein decreasing in shearing viscosity and shear stress was observed as the shearing time increased. Furthermore, different behaviors were observed for the blend solutions when the period of storage was extended to three weeks. The FTIR results and the differential scanning calorimetery (DSC) curves showed that the interaction between chitosan and agar can occur.

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Section: Introductionmentioning

confidence: 99%

Preparation and Characterization of Chitosan/Agar Blends: Rheological and Thermal Studies

El-Hefian

Nasef

Yahaya

et al. 2010

J. Chil. Chem. Soc.

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“…Accordingly; blending two polymers is an approach to develop new biomaterials exhibiting combinations of properties that could not be obtained by individual polymers [23]. The analysis of FTIR spectrum of each blend enables studying the interactions which possibly take place.…”

Section: Ftir Results Of the Studied Blendsmentioning

confidence: 99%

Molecular spectroscopic analysis of nano-chitosan blend as biosensor

Ibrahim

Mahmoud

Osman

et al. 2010

Spectrochimica Acta Part A: Molecular and Biomolecular Spectros

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“…The changes in two-component film samples caused by biodegradation were examined by means of measurements of weight loss, mechanical properties, water sorption capacity, respirometry and microscopic studies by optical and scanning electron microscopy (SEM) [7,8]. [9].…”

Section: Test Methodsmentioning

confidence: 99%