1.

Write short note : Nylon-6,6

Answer»

Solution :Preparation : It is prepared by the condensation polymerization of hexamethylene-diamine with adipic acid under high pressure and at high temperature.
`nHOOC(CH_(2))_(4)COOH+nH_(2)N(CH_(2))_(6)NH_(2)overset("553 K")UNDERSET("High pressure")rarrunderset("NYLON 6,6")([--N-(CH_(2))_(6)-overset(H)overset(|)N-overset(O)overset(||)C(CH_(2))_(4)-overset(O)overset(||)C--]_(n))+nH_(2)O`
PROPERTIES : Nylon 6, 6 is fibre forming solid.
It possess high tensile strength.
These high tensile strength can be attributed to the strong intermolecular forces like hydrogen bonding.
These strong forces also LEAD to close packing of chains and thus impart crystalline nature.
Uses : Nylon 6, 6 is used in making sheets, bristles for brushes and in textile undustry.


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