Which of the following polymers need at least one diene monomer for their preparation?
A) Dacron
B) Neoprene
C) Buna-S
D) Both B and C
Answer (2)
Dacron does not require a diene monomer, while Neoprene and Buna-S do. Therefore, the correct option is D) Both B and C, as both Neoprene and Buna-S need at least one diene for their preparation.
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To determine which of the given polymers require at least one diene monomer for their preparation, let's analyze each option:
A) Dacron : Dacron is a type of polyester, specifically polyethylene terephthalate (PET). It is synthesized from terephthalic acid and ethylene glycol. It does not require a diene monomer for its preparation.
B) Neoprene : Neoprene is a synthetic rubber made using chloroprene (2-chlorobuta-1,3-diene) as the monomer. Since chloroprene is a diene, at least one diene monomer is needed in its preparation.
C) Buna-S : Also known as SBR (styrene-butadiene rubber), this polymer is prepared from styrene and butadiene. Butadiene is a diene monomer, thus Buna-S requires a diene monomer for its synthesis.
Based on this analysis, the polymers that need at least one diene monomer for their preparation are Neoprene and Buna-S.
Therefore, option D (Both B and C) is correct.
