The addition of natural additives like cornstarch or potato starch to polymer-based packaging materials can have several effects on their mechanical and barrier properties, as well as their environmental impact.1. Mechanical properties: The incorporation of starch into polymer-based materials can lead to changes in their mechanical properties, such as tensile strength, elongation, and flexibility. In some cases, the addition of starch can improve these properties, making the material stronger and more resistant to tearing. However, in other cases, the addition of starch can lead to a decrease in mechanical properties, making the material more brittle and prone to cracking. The specific effects depend on the type and amount of starch used, as well as the processing conditions.2. Barrier properties: Starch additives can also affect the barrier properties of polymer-based packaging materials, such as their resistance to gas and moisture permeation. Starch is generally more permeable to gases and moisture than synthetic polymers, so incorporating starch into the material can lead to a decrease in barrier properties. However, this effect can be mitigated by using a blend of starch and synthetic polymers or by modifying the starch to improve its barrier properties.3. Environmental impact: One of the main advantages of using natural additives like cornstarch or potato starch in packaging materials is their potential to reduce the environmental impact of the materials. Starch is a renewable and biodegradable resource, which means that packaging materials containing starch can break down more quickly and easily in the environment than those made solely from synthetic polymers. This can help to reduce the amount of plastic waste that ends up in landfills and the ocean.However, it is essential to consider the environmental impact of producing the starch itself, as the cultivation of corn and potatoes can require significant amounts of water, energy, and land, and may involve the use of pesticides and fertilizers. Additionally, the processing of starch can generate waste and greenhouse gas emissions. Therefore, it is crucial to weigh the environmental benefits of using starch additives against the potential drawbacks associated with their production.In conclusion, the addition of natural additives like cornstarch or potato starch to polymer-based packaging materials can have both positive and negative effects on their mechanical and barrier properties, as well as their environmental impact. The specific effects depend on the type and amount of starch used and the processing conditions. To optimize the performance and sustainability of these materials, it is essential to carefully consider the choice of additives and their proportions, as well as the overall production process.