Give reasons for the following:
a. People prefer to wear acrylic sweaters as compared to pure wool sweaters.
b. Rayon is prepared from wood pulp, but it is still called a synthetic fibre.
c. Nylon is used to make parachutes.
Answers
Answer:
. Nylon fibres are very strong so they are used for making parachutes and ropes for rock-climbing.
A) As acrylic fabric is less expensive and cheaper (lesser quality) than wool. Wool takes a long time to be ready for market where as acrylic is a synthetic that is easily mass produced.
B) Rayon is manufactured regenerated cellulose fiber. It is made from purified cellulose from wood pulp which is converted into soluble compound which is chemically solidified to form synthetic fiber. Because rayon is manufactured from naturally occurring polymers, it is considered a semi-synthetic fiber.
C) Nylon fabric became important as a synthetic substitute for silk in the manufacture of parachutes when silk became scarce during WWII. Nylon is still used today to make parachute canopies due to its elasticity, strength, resistance to mildew, availability and price.