Polyvinyl alcohol, or PVA, is a popular type of plastic film used in packaging. Its benefits include increased strength and flexibility, and it is also a good moisture barrier. The downside of using polyethylene glycol, however, is that it lowers the tensile strength of the film. As such, this type of film is not suitable for outdoor applications.
Polyvinyl alcohol
The barrier properties of a polyvinyl alcohol-coated film are excellent in both high and low relative humidity environments. The absence of waxes in the polymer makes it an excellent barrier material. This polymer possesses a high elongation modulus and a wide range of optical properties. Therefore, it is an excellent choice for applications involving visibility and air quality. Polyvinyl alcohol-coated films are excellent for these purposes and provide superior performance compared to their conventional counterparts.
Modified PVA/PE film
The modified PVA/PE film exhibits excellent antifogging behavior and is highly transparent. The surface roughness and oxygen-containing polar functional group of the modified PVA film increase water molecule absorption through hydrogen bonding and dipole-dipole interactions. This results in small contact angles and improved adhesive properties. Additionally, light cannot scatter off the surface of the film, thereby achieving a high level of transparency.
PVA copolymer
The oxygen barrier properties of PVA copolymer coated films are excellent, ensuring that the substance does not allow the smell of any drug or material to enter the coating. This property has wide-ranging applications, from masking offensive odours to preserving the aromas of fragrant materials. The study was conducted on a ten percent PVA copolymer coated film and a pro-oxidant-coated tablet core.
Storage conditions
Acid induced reactivity in PVA-based films poses a greater risk than alkaline reactivity. Acid-induced reactivity can also occur when the film is exposed to common impurities. Future studies should investigate the mechanisms underlying acid-induced reactivity in PVA-based films. NH4HSO4 is a good example of an acid salt. However, it is important to note that acid salts can differ in many ways.
Odour masking
The use of PVA-coated film as a barrier against odours is commonly used in medical facilities. This film provides a quick barrier to odours, and the effectiveness of the barrier is dependent on the amount of film that is applied. The Opadry (r) film, for example, disintegrates in water after 30 minutes, whereas PVA-based films disintegrate after 24 hours. However, there are certain disadvantages to using these films.
Viscosity changes
The viscosity and porosity of clay-based coatings increased rapidly with the addition of PVA. Clay colors that contained PVA showed lower shear viscosity than those containing GCC. The loose arrangement of the clay particles was attributed to the low shear viscosity of the PVA-coated film. In addition, the platy particles were held together by PVA molecules and were easily disrupted in high-shear conditions.
Polyethylene glycol
In this study, polyethylene glycol 200 was used as a pore forming agent and plasticizer in cellulose acetate films. The amount of polyethylene glycol added to the films varied significantly and its effect on the film's strength and morphology was investigated. Results showed that the presence of polyethylene glycol 200 increased water permeability and decreased film strength. The findings of the study may help pharmaceutical companies develop improved formulations that could withstand harsh conditions.
