The interplay between macromolecular structure, rheology, processing condition, and morphology for (linear) low density polyethylenes in film blowing

Abstract

Film blowing is a crucial plastic conversion technique for (Linear) Low Density Polyethylene ((L)LDPE), widely employed in the industry. However, understanding its complexities, which involve a delicate interplay between various parameters, such as macromolecular features, flow behavior, processing conditions, and final film performance, remains limited in the literature. Notably, the quantification of processability in film blowing has not yet been adequately addressed. Present study investigates the key parameters in this interplay, introduces a framework to quantify the processability, and establishes its connection with molecular weight (distribution) and the extensional flow behavior of (L)LDPE. Additionally, selected processing conditions are correlated with the crystalline morphology and performance of the films. The findings of this research offer a fundamental understanding of the film blowing process and serve as a valuable baseline for future endeavors involving more complicated polymer systems, such as blends and contaminated recyclates. By shedding light on the crucial parameters and their interdependencies, this work contributes to advancing the efficiency and quality of the process, facilitating the production of high-performance films.