Title : Advancing non-woven PPE materials: Heat-resistant stereocomplex PLA-rPET blend
Abstract:
Poly(lactide) (PLA) is a biodegradable polymer that finds widespread applications in various industries. However, its low heat resistance has been a limiting factor, hindering its use in high-temperature applications. This study endeavors to overcome this drawback by creating a stereocomplex PLA, a promising approach to enhance PLA's heat resistance significantly. To achieve this, it is expected to blend poly(L- lactide) and poly(D-lactide) using a co-rotating twin-screw extruder. The combination of these two enantiomers will result in the formation of a stereocomplex, a crystalline structure known for its improved thermal properties. The team will employ Differential Scanning Calorimetry (DSC) and Thermal Deflection Temperature (HDT) analysis to thoroughly characterize the stereocomplex PLA and confirm its enhanced heat resistance. The ultimate goal of this study is to develop a blend of stereocomplex PLA and recyclable polyethylene terephthalate (rPET) for use in non-woven applications, particularly in the manufacturing of personal protective equipment (PPE). By incorporating the high-temperature resistant stereocomplex PLA into the rPET matrix, it is expected to create a composite material that is both mechanically robust and thermally stable, making it well-suited for non-woven fiber production. To ensure the composite's stability and longevity, appropriate antioxidants will be incorporated into the blend. Primary antioxidants, such as phenolic-based additives, and secondary antioxidants, including phosphite and HALS-based compounds, will be utilized to prevent degradation caused by heat, light, and oxygen exposure. Additionally, an epoxy-based chain extender will be introduced, which will react with hydroxyl groups formed during PLA degradation or present as moisture, further enhancing the blend's overall performance and durability. It will be determined the optimum ratio of stereocomplex PLA that can be blended with rPET while considering their distinct processing characteristics. This critical aspect will be evaluated through characterization, including extensional rheometry, DSC, and tensile strength analysis. The significance of this study lies in the potential to produce a novel material that satisfies the stringent requirements of non-woven fiber production, particularly in the context of PPE. If successful, the newly developed composite material could find applications beyond the realm of protective gear and offer a sustainable solution to various industries in need of thermally stable and environmentally friendly materials. In conclusion, the study aims to advance the application of PLA in high-temperature scenarios by creating a stereocomplex PLA and blending it with rPET. By enhancing heat resistance and incorporating essential additives, the study aims to create high- performance materials that can meet the demands of diverse industries while also contributing to a greener and more sustainable future.
Audience Take Away:
- The audience will gain valuable insights into enhancing the heat resistance of Poly(lactide) (PLA) through stereocomplex formation. They will learn about the process of blending poly(L- lactide) and poly(D-lactide) to create a stereocomplex PLA and the various techniques used for characterization, such as Differential Scanning Calorimetry (DSC) and Thermal Deflection Temperature (HDT) analysis. This knowledge will enable them to develop advanced materials with improved heat resistance, opening up new possibilities for PLA in high-temperature applications.
- The research findings will benefit the audience by providing them with a practical solution to the heat resistance limitations of PLA. By incorporating stereocomplex PLA into recyclable polyethylene terephthalate (rPET), they can create a high-performance composite material suitable for non-woven fiber production, particularly in the context of personal protective equipment (PPE) manufacturing. This will enable professionals to design and develop PPE with enhanced thermal stability, improving the overall performance and safety of such products.
- The study's methodology, involving the creation and characterization of stereocomplex PLA, as well as the incorporation of necessary additives for improved performance, can inspire further investigations and experiments in the domain of polymer blends and composites. Moreover, this research can be used to enrich teaching materials for students interested in polymer science and sustainable materials development.
- The research aims to provide a practical solution to the low heat resistance of PLA, which has been a limiting factor in designing products for high-temperature applications. By creating a stereocomplex PLA and blending it with rPET, designers can access a novel composite material that combines the benefits of both components, resulting in improved thermal stability and mechanical performance. This can simplify the design process and make it more efficient for developing heat-resistant products, saving time and resources.
- The research will likely lead to improved accuracy in designing products requiring heat resistance. By understanding the properties of stereocomplex PLA and its blending characteristics with rPET, designers can make informed decisions when developing non- woven fiber materials for PPE and other applications. The new information obtained from the study's characterization techniques will assist in optimizing the blend composition and processing conditions to achieve the desired performance and reliability.
- Contribution to sustainability: By utilizing PLA, a biodegradable polymer, and recyclable rPET, the study promotes environmentally friendly materials and reduces the reliance on conventional, non-biodegradable plastics. Diversification of applications: The development of heat-resistant PLA opens up new possibilities for its use in industries that require materials with enhanced thermal properties, beyond traditional applications. Industry advancement: The research can drive innovation in the field of polymer processing and composite materials, contributing to advancements in manufacturing techniques and product development. Economic impact: With the potential for a more efficient and sustainable material, industries can benefit from cost savings and reduced environmental impact, leading to a positive economic outcome
