JEE Main · 2021 · 20 Jul 2021 · Shift 2 · Polymers

Bakelite is a cross- linked polymer of formaldehyde and :

(A)PHBV
(B)Buna - S
(C)Novolac✓ Correct
(D)Dacron

Answer: (C)

Solution

Phenol and formaldehyde condense under acid control into a linear chain in which the rings are joined through

- C H_{2} -

bridges; this chain of low molecular mass is novolac. Heating novolac with more formaldehyde bridges the ortho and para positions that are still free, so the separate chains become tied into a rigid three dimensional network, and that network is bakelite. The polymer cross-linked with formaldehyde to give bakelite is novolac.

JEE Main · 2021 · 20 Jul 2021 · Shift 2 · Single correct option

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