Alcohol Blend Films Research Articles

Effect of nano-SiO 2 on the performance of starch/polyvinyl alcohol blend films

In this paper, several starch/polyvinyl alcohol (PVA)/nano-silicon dioxide (nano-SiO 2) biodegradable blend films were prepared by a solution casting method. The physical and biodegradable properties of this film were also studied. From the results, SPS5 was found to have the best tensile strength at about 15.0 MPa, and its elongation at break was 120%. With the increase in nano-SiO 2 content, the water resistance of the films was also improved. Additionally, SPS5 had the best optical transparence in all of the films. The soil burial test showed that the addition of nano-SiO 2 has no significant influence to the biodegradability of the films. Moreover, the results indicated that an intermolecular hydrogen bond and a chemical bond C O Si were formed in the nano-SiO 2 and starch/PVA. Therefore, the miscibility and compatibility between starch and PVA were increased, and the physical properties of the additional nano-SiO 2 were improved.

Oxygen barrier properties of biaxially oriented polypropylene/polyvinyl alcohol blend films

Oxygen barrier properties of biaxially oriented polypropylene/polyvinyl alcohol blend films

Oxygen barrier properties of biaxially oriented polypropylene/polyvinyl alcohol blend films

The biaxially oriented PP/PVA blend film was prepared and had the higher oxygen barrier property by about 130 times than that of a biaxially oriented PP film. When the viscosity ratio (ηd(PVA)/ηm(PP)) decreased, the dispersed PVA phase was developed into platelets during stretching process. Oxygen permeability was dependent on the number and size of PVA platelet. However, the Oxygen permeability was not sensitively changed in above 25wt% of PVA. To obtain excellent barrier property, the optimum amount of plasticizer and initiator was required. A pasticizer was related to the size and degree of crystallization of PVA platelet. An initiator played the role of a compatibilizer. The oxygen barrier was enhanced with increasing the viscosity of PP and draw ratio. The higher viscosity of PP was advantageous for preventing the delamination of a blend film, and the moisture vapor permeability was not affected with the laminar structure. As a result, the biaxially oriented PP/PVA blend film had the potential of substituting for the PVDC coated BOPP film.

Properties and sorption studies of chitosan–polyvinyl alcohol blend films

Chitosan–polyvinyl alcohol (PVA) blend films were prepared and characterized for mechanical and optical properties. Intermolecular interaction between chitosan–PVA blend was investigated using FTIR. Moisture sorption characteristics of chitosan–PVA blend at 25 °C were studied for water activities ranging from 0.11 to 0.92. The moisture content increased with increase in PVA concentration. The moisture sorption data were used to fit eight sorption models and constants were determined by linear fitting. The co-efficient of linear regression (0.98–0.99) and root mean square error values (1.08–15.32) confirmed the best fit for all the models. GAB model was applicable for a wide range of water activity.