How to Increase the Mechanical Properties of PE or to Possess the Functions that PE Does not Have?

Here are a few approaches to increase the mechanical properties of PE film or to add other functions that PE doesn't inherently possess:

1. Blending with Polypropylene (PP): Blending PE with PP can improve the mechanical properties of the resulting film. A study had been found that the addition of PP increased the tensile strength and modulus of the films, while maintaining good flexibility.

2. Incorporating Fillers or Reinforcements: Adding fillers or reinforcements to PE films can enhance their mechanical properties. For example, studies have explored the use of nanoparticles (such as graphene or clay) or fibers (such as glass or carbon fibers) to reinforce PE films. These additives can significantly improve the tensile strength, modulus, and impact resistance of the films.

3. Crosslinking: Crosslinking PE films can increase their mechanical strength and dimensional stability. This can be achieved through various methods, such as irradiation, chemical crosslinking agents, or reactive extrusion. Crosslinked PE films exhibit improved tensile strength, tear resistance, and thermal stability.

4. Multilayer Structure: Creating a multilayer structure by laminating or coextruding PE with other polymers or functional layers can provide additional functionalities. For example, incorporating an ethylene vinyl alcohol (EVOH) layer can enhance the oxygen barrier properties of the film, making it suitable for food packaging applications. Similarly, adding a layer of polyamide (PA) can improve moisture barrier properties.

5. Surface Modification: Modifying the surface of PE films can impart additional functions such as improved adhesion, printability, or water repellency. Techniques like corona treatment, plasma treatment, or coating with functional materials can enhance the surface properties of the film.

These approaches have been studied and applied in various research papers and industrial applications. However, it's important to note that the specific choice of approach will depend on the desired properties and the intended application of the PE film. Further research and testing are recommended to optimize the formulation and processing conditions for each specific case.