Discussion
Which of the following polymers is sensitive to moisture absorption?
Answer: C
The polymer sensitive to moisture is Polyamide 6.
Nylon 6 contains polar amide groups (-CO-NH-) that form hydrogen bonds with water. It can absorb about 2 to 3 percent water from the air and up to about 9 percent when saturated, which plasticises it, lowers its stiffness and changes its dimensions. It must be dried before moulding to avoid hydrolysis and voids.
Polyethylene, polystyrene and polybutadiene are hydrocarbons with no polar groups and absorb almost no water.
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