Investigation and optimization of polyolefin elastomers polymerization processes using multi-objective genetic algorithm

Chromium Catalysts for Selective Ethylene Oligomerization Featuring Binuclear PNP Ligands

“…1 H, 13 C, and 31 P spectra were recorded on a Bruker Avance III spectrometer (400 MHz for 1 H NMR, 101 MHz for 13 C NMR, and 162 MHz for 31 P NMR) at room temperature in chloroform-d (purchased form Innochem). A suitable crystal was selected and carried out on a Bruker D8 VENTURE dual wavelength Mo/Cu diffractometer [48][49][50].…”

“…1 H NMR (400 MHz, CDCl 3 ): δ 5.97 (s, 4 H), 7.14-7.42 (m, 40 H). 13 Cyclohexane-1,4-diamine (1.14 g, 10 mmol) and triethylamine (4.55 g, 45 mmol) were dissolved in 100 mL of dichloromethane. Ph 2 PCl (8.87 g, 40.2 mmol) was slowly added at 0 • C. The mixture was stirred for 2 h at room temperature and then for an additional 24 h. The volatiles were removed under reduced pressure, and the residue was extracted using anhydrous THF (3 × 10 mL).…”

“…Crystal data and structure refinement of L2 were demonstrated in Supplementary Materials Table S1). All the ligands were identified via 1 H, 31 P, and 13 C NMR and high-resolution MS (Figures S1-S20, Supplementary Materials). To evaluate the catalytic performance of the synthesized ligands, we conducted ethylene-selective oligomerization at 50 bar and 40 • C. The typical results are presented in Table 1.…”

“…LLDPEs that contain comonomers 1-hexene or 1-octene exhibit higher tensile strength, impact resistance, tear resistance, and durability compared to those using 1-butene as a comonomer. The use of this PE resin as a high-value additive can result in the creation of thin yet highly flexible and robust LLDPE films [6][7][8][9][10][11][12][13]. Additionally, 1-hexene and 1-octene are utilized in the production of polyolefin elastomers (POE) [14].…”