Chitosan filler effects on the experimental characterization, spectroscopic investigation and thermal studies of PVA/PVP blend films (original) (raw)
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Thermal Study of Chitosan Blends with Vinyl Polymers
Techniques of thermal analysis have been used for many years for characterization of poly-mer materials. Thus, differential scanning calorimetry (DSC), thermogravimetric analysis (TGA), dynamic mechanical thermal analysis (DMTA) are widely employed in both scien-tific and industrial sectors. In the present paper, the thermal studies (DSC and TGA) of chitosan acetate (ChA) with poly(vinyl alcohol) (PVA) or polyacrylamide (PAM) blends were discussed. Recently Mucha and cowokers [1, 2] have reported the results on miscibility of chitosan and poly(vinyl alcohol) by thermogravimetric analysis, FTIR [1], differential scanning calorimetry (DSC) and the dynamic mechanical thermal analysis (DMTA) [2]. The authors [1, 2] did not consider the influence of the hydrolysis degree of PVA on the miscibility of chitosan with PVA. The purpose of this study was to evaluate the thermal stability and miscibility of chitosan with PVA or PAM, on the basis of differential scanning calorimetry (Hyper DSC) a...
Evaluation of the structural and optical characters of PVA/PVP blended films
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The effect of gamma irradiation on the optical and structural properties of poly(vinylalcohol) (PVA)/poly (vinylpyrrolidone) (PVP) blends was investigated in this study. The PVA/PVP films were formulated by mixing and casting method with increasing PVA ratios. The dried films were irradiated at 30 kGy and the impact of gamma irradiation on the characteristics of these films was inspected using FTIR, XRD, SEM and UV-vis techniques in the wavelength range (200-1200) nm. Swanepole method was used to compute the optical constants, optical band gap and complex dielectric constant whereas Wemple-DiDmenico model was applied to develop the optical dispersion parameters E o and E d. Additionally, the high frequency dielectric constant (ε ∞) for all films was recorded. A slight shift in the FT-IR spectra and increase in the transmittance for all films post-irradiation were detected and the XRD analysis depicted the crystalline nature of the PVA/PVP films which was further confirmed by the surface morphology images obtained by the SEM. In conclusion, gamma irradiation and increasing the PVA to PVP ratio improved the optical properties of the films.
Poly (vinyl alcohol)-chitosan blends: preparation, mechanical and physical properties
2003
P oly (vinyl alcohol)-chitosan blend films were prepared by casting the respective polymer solutions. The glutaraldehyde was used as a cross-linking agent. A series of PVA-chitosan blends were prepared by varying the ratio of the constituents. Mechanical and physical properties of blended films such as tensile properties in the dry and wet states, water uptake, surface tension and contact angle were characterized. Blending PVA and chitosan improved strength and flexibility of the films in the dry and wet states. Cross-linking with glutaraldehyde improves tensile strength and decreases elongation of the films. PVA Content in the blends increases water uptake while cross-linking the films with glutaraldehyde causes less hydrophilicity. Water uptake in PVA-chitosan blends can be controlled by variation of their contents, cross-linking agent and the pH of solution. Blending of PVA and chitosan improves bulk and surface hydrophilicity of blended films.
Morphological, Thermal and Rheological Characterization of Polyvinyl Alcohol/Chitosan Blends
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The present study deals with the preparation of polyvinyl alcohol (PVA)/chitosan (CS) blends with different compositions. The physico-chemical characterization and compatibility have been studied by means of polarized light optical microscopy, FT-IR spectroscopy, DSC, DMTA, TG/DTG and rheological measurements. The film-forming ability of the blends was confirmed by rheological tests, as they showed higher viscosity and improved viscoelastic properties in comparison with pure PVA. The obtained films were transparent and homogenous with enhanced mechanical properties and thermal stability.
Journal of Chemistry, 2011
In this study, blends of chitosan (CS) and polyvinyl alcohol (PVA) (CS/PVA) having various proportions were prepared and characterized by universal mechanical tester, the differential scanning calorimetry (DSC) and contact angle measurements. Studying the mechanical properties of the films showed that blending improved the tensile strength, which increased with increasing PVA content up to 40% while the elongation% at break of the blends was decreased compared to that of the pure components. The obtained results of DSC suggested that some interaction between chitosan and PVA mostly took place. Static water contact angle measurements showed an improvement in the wettability of the obtained films.
International Journal of Heat and Technology
PVA (polyvinyl alcohol) and chitosan polymers are two widely used polymers in bioplastic due to their biodegradable properties. This research aims to characterize the mechanical, physical, and thermal properties of combined PVA 3 wt.% and chitosan by 0.5, 1, and 2 wt.% as bioplastic films. It was tested using tensile, X-ray diffraction, Fourier transforms infrared, scanning electron microscopy, and thermogravimetry analysis. Adding 1 wt.% chitosan increases the bioplastic film's tensile strength and thermal stability by 60% and 49℃, respectively. In addition, adding this chitosan also increases the bioplastic film's crystallinity index. However, adding 2 wt.% chitosan affected stiffness and brittle, which indicates a decrease in the elongation at break by 27%.
Miscibility and thermal stability of poly(vinyl alcohol)/chitosan mixtures
Thermochimica Acta, 2009
The miscibility and the thermal behaviour of chitosan acetate (ChA) with poly(vinyl alcohol) (PVA) have been investigated by differential scanning calorimetry (DSC), thermogravimetric analysis (TGA) and dynamic mechanical analysis (DMA). Chitosan is blended with poly(vinyl alcohol) in acetic acid solution and this solution is cast to prepare the blend film. From thermal curves the thermal transitions: T g , T m and characteristic temperatures of decomposition: T di , T max have been determined and compared. The influence of the degree of PVA hydrolysis on the thermal properties of blend systems has been discussed.
Preparation and characterization of hexanoyl chitosan/polylactide blend films
Carbohydrate Polymers, 2005
In the present contribution, blend films of hexanoyl chitosan (H-chitosan) and polylactide (PLA) were prepared by the solution-casting technique from the corresponding blend solutions in chloroform. Fourier-transformed infrared spectroscopy results indicated no significant interaction between H-chitosan and PLA molecules. The thermal degradation behavior of the as-prepared blend films was found to be intermediate to those of the pure components. Only the blend film having the H-chitosan content of 20 wt% exhibited the degradation temperature greater than those of the pure components. All of the blend films exhibited one composition-dependent glass transition temperature, indicating partial miscibility between H-chitosan and PLA molecules in the bulk amorphous phase. The apparent degree of crystallinity of the PLA component in the blends was found to decrease monotonically with increasing H-chitosan content. Both the tensile strength at break and the Young's modulus of the blend films were found to decrease from that of the pure PLA to that of the pure H-chitosan with increasing H-chitosan content. q
Mechanical, Thermal and Surface Investigations of Chitosan/Agar/PVA Ternary Blended Films
E-Journal of Chemistry, 2011
The mechanical and thermal properties of chitosan/agar/poly vinyl alcohol (CS/AG/PVA) ternary blended films having various proportions considering chitosan as the main component were investigated. The various variables static water contact angle such as contact angle, drop base area, drop volume and drop height was also studied in correlation with the variation of time. Results obtained from mechanical measurements showed a noticeable increase in the tensile strength (TS) coincided with a sharp decrease in elongation percent at break (E%) of blended films with increasing agar and PVA contents. The DSC results prevailed the development of an interaction between chitosan individual components: agar and PVA. Moreover, an enhancement of the wettability of the blends was obtained with increasing agar and PVA contents. It was also found that the pure CS film and the blended films with 90/05/05 and 80/10/10 compositions were more affected by time than blended films with other compositions when the contact angle, the drop height and the drop length were studied as a function of time. In addition, when the drop is initially placed on the substrate, the drop area and the drop volume of all films remained almost constant up to a certain time after which they showed a slight difference with the elapse of time.
Study of blend films from chitosan and hydroxypropyl guar gum
Journal of Applied Polymer Science, 2003
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.