Q. Which of the following statements are correct about phenolformaldehyde resin?

Polymers Report Error

A

Novolac or resol is a linear polymer and is used in the manufacture of adhesive.

B

Bakelite is a cross-linked polymer and is used in making switches and plugs.

C

Novolac is prepared when (P/F) (phenol/formaldehyde) ratio is greater than 1 , whereas bakelite is prepared when (P/F) ratio is less than

D

Novolac is prepared when , and bakelite is prepared when .

Solution:

Correct answer is (a) Novolac or resol is a linear polymer and is used in the manufacture of adhesive.Correct answer is (b) Bakelite is a cross-linked polymer and is used in making switches and plugs.Correct answer is (c) Novolac is prepared when (P/F) (phenol/formaldehyde) ratio is greater than 1 , whereas bakelite is prepared when (P/F) ratio is less than

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