In-Situ Thermometry Reveals Fragmentation Behavior Based on Local Temperature in α-Olefin Polymerization Catalysts.

ABSTRACT: Typical industrial olefin polymerization processes to produce both commodity and specialty polyolefin grades are mainly based on spherical, heterogeneous catalyst particles. During α-polymerization, heat from the exothermic reaction and pressure induced by the growing polymer chains on the catalyst particle lead to fragmentation, revealing active sites for further polymerization. To study these phenomena precisely and in-depth, we utilized a Nd-doped LaOCl-supported metallocene model system. This model catalyst can accurately display fluctuations in temperature with luminescence thermometry. During mild gas phase prepolymerization conditions, we observed a temperature difference of +43 °C and link this to the exothermicity of the ethylene polymerization reaction. In addition, the fragmenta

SUBMITTER: Dorresteijn JM 

PROVIDER: S-EPMC11848817 | biostudies-literature | 2025 Feb

REPOSITORIES: biostudies-literature