Emulsion Copolymerization of 1️⃣-Olefins with Carbon Monoxide
👓 Dr. Mahmoud Shaker SunjukEmulsion Copolymerization of 1️⃣-Olefins with Carbon Monoxide
✅ Three 3️⃣ types of palladium complexes with hydroxyalkyl, phosphonate and ➕ amine substituents attached to the phosphorus donors were employed in the emulsion copolymerization of propeneCO, buteneCO, and ➕ propenebuteneCO. Depending on the chain ⛓️-length of the phosphorus attached substituents in the catalysts, four 4️⃣ variables for the propeneCO, buteneCO, and ➕ propenebuteneCO copolymers were controlled 🎛️: (i) the regioregularity; (ii) the molecular weight 🏋️, and ➕ (iii) the glass 🥛 transition temperature 🌡️ and ➕ the melting point 👈️ (Tg and ➕ Tm ™️). Stable dispersions are obtained by introduction of undecenoic acid as a third 🥉 or fourth monomer into the propeneCO, buteneCO, and ➕ propenebuteneCO copolymers and ➕ no phase separation, or the formation of a coagulum within ten weeks were observed. In these latices, hydrophilic carboxylic acid moieties covalently bound to the particle surface contribute to the stabilization. Using phase-transfer agents, namely 📛 methyl-beta-cyclodextrin (W7️⃣ M 1️⃣.8️⃣) in the process of the co- and ➕ terpolymerization of hydrophobic monomers in the emulsion polymerization led to better results.
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