Download Examples of condensation polymerization 1-Nylon 6,6 Synthesis and more Summaries Chemistry in PDF only on Docsity! II- Examples of condensation polymerization 1-Nylon 6,6 Synthesis Background Nylon 6,6 is the polymer used to help show how step-growth polymerization works in this lab. Step-growth polymerization can have any polymer or monomer react, so the monomers disappear quickly. The molecular weight increases slowly because the monomers react, but the molecular weight increases quickly towards the end of the polymerization because small chains are forming larger chains. There is also another product besides the polymer after polymerization. For example, after Nylon 6,6 forms, the leftover product was water. Step-growth polymerization often requires two different monomers to form one polymer. Step-growth polymerization occurs when monomers start to join together. Any monomer can star forming chains, so the molecular weight is low. Towards the end of the process, the small chains start to form larger chains, so the molecular weight increases dramatically. Procedure Materials 1) 10mL - 0.35 M aqueous hexamethylenediamine 2- 10mL – 5 vol% adipoyl chloride in cyclohexane solvent (3) 10 Drops – 20wt% aqueous sodium hydroxide We prepared 25mL of the first component, 0.35M aqueous hexamethylenediamine, using 1 gram of 1,6 hexanediamine and 25mL of water. 10mL were poured into a 50mL beaker and then set aside for later. 20mL of the second component, 5 vol% adipoyl chloride, was made from 1mL of adipoyl chloride and 19mL of cyclohexane. 10mL were set aside and covered in order to prevent evaporation. Finally, the last component (20wt% aqueous sodium hydroxide) was made from 5g of sodium hydroxide pellets and 20mL of water. Synthesis 10 drops of the sodium hydroxide solution was added to the 50mL beaker containing 10mL the hexamethylenediamine solution. The beaker was tilted at a 45° angle and the 10mL of adipoyl chloride was slowly poured down the side of the beaker to slowly add it to the solution. A polymer film formed immediately at the liquid-liquid interface and stuck to the outside of the beaker. Shows the liquid-liquid interface with Nylon 6,6 forming in between. We used a copper wire with a hook on the end to break the nylon free and then gently pulled the wire up out of the solution in the middle of the beaker. A rope formed on the end of the wire; we pulled it for a few feet, broke the rope and placed it on a paper towel to dry out. The rest of the solution was stirred and a
