Design of cyclophane-based late transition metal catalyst for polymerization of olefins

• Main Authors: Camacho, Drexel H., Guan, Zhibin
• Format: text
• Published: Animo Repository 2005
• Subjects: Transition metal catalysts; Alkenes; Polymerization; Chemistry
• Online Access: https://animorepository.dlsu.edu.ph/faculty_research/5722
• Institution: De La Salle University

New catalysts design! In the effective polymerization of ethylene, design of new catalyst is achieved by exploiting the macrocyclic architecture of a cyclophane-based diamine ligand. In the ligand design, the metal binding sites is strategically positioned at the core of cyclophanes to chelate transition metals. The cyclophane framework shields all direction of the catalytic melt center except leaving two cis coordination sites open in the front: one for monomer coordination and the other for the growing polymer chain. The well-defined cavity and stretically hindered microenvironment of cyclophanes offer great opportunities for fine –tuning the catalytic properties. The rigid cyclophane framework also enhances the stability of transition metal center at the core of the cyclophane-based ligand is the key to the observed high activity, thermal stability and living polymerization activity of the catalyst. Likewise, the catalyst gave polymers with high degree of branching and high molecular weights as well as high incorporation of methyl acrylate.