![]() They should be able to produce up to 5m before the fibre snaps. Demonstrate how the fibre can be pulled out in one continuous thread and then set up a competition to see which pair of students can produce the longest fibre. Special tipsĬare must be taken when adding the second solution to avoid mixing. Stop the process when one of the reactants is used up. Wrap the fibre around a glass rod and continue to pull. Grab the polyamide film (a white solid) that begins to form at the interface of these two solutions with tweezers and slowly pull it out of the beaker. Solution A contains the organic solvent, is denser than the aqueous layer, and therefore is the bottom layer. Carefully add an equal volume of solution B. Pour 2cm 3 solution A into a 5cm 3 beaker. Add 5.0g of solid 1,6-diaminohexane and stir to dissolve. Put 100cm 3 distilled water into a 250cm 3 beaker, add 10g anhydrous sodium carbonate and stir to dissolve. Solution B: 1,6-diaminohexane in aqueous sodium carbonate. This solution keeps for about four weeks. Put 100cm 3 cyclohexane into a 250cm 3 beaker, add 5.0cm 3 decanedioyl dichloride and stir to dissolve. Solution A: decanedioyl dichloride in cyclohexane. ![]() Cyclohexane is highly flammable and an irritant. They are harmful if swallowed or inhaled, and in contact with the skin cause burns. Decanedioyl dichloride and 1,6-diaminohexane are corrosive.
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