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Analyze please: 1.0 mol of diamine was dissolved in methanol. Maleic anhydride (2.1 mol) as a methanol solution was added dropwise over a period of 10 min at RT. The solution was maintained at 50 °c for 2 h in a thermoregulated bath. Cyclization of aminic acid was carried out by adding an excess amount of fused sodium acetate and acetic anhydride mixture.
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The described procedure appears to be a synthesis of a polyamide. Here's a breakdown:
1. Reaction Initiation: Diamine reacts with maleic anhydride, likely forming a polyamic acid. The methanol solvent facilitates the reaction, and the slow addition of the anhydride helps control the polymerization.
2. Thermal Treatment: The reaction mixture is heated to 50°C for 2 hours. This step may be crucial for further polymerization and potentially for ring opening of the maleic anhydride.
3. Cyclization: The addition of fused sodium acetate and acetic anhydride leads to the cyclization of the polyamic acid to a polyimide. Sodium acetate acts as a base to remove the water molecule formed during cyclization. Acetic anhydride facilitates the cyclization by providing an acetyl group, which replaces the hydroxyl group in the polyamic acid.
The specific polyimide formed depends on the exact identity of the diamine used. This process is a common method for synthesizing polyimides, which are known for their high thermal stability and good mechanical properties.
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