What is a Dicyclopentadiene (DCPD)?

Dicyclopentadiene (DCPD, chemical formula: C₁₀H₁₂) is a bicyclic compound formed by the dimerization of two cyclopentadiene molecules. At room temperature, it appears as a colorless to pale yellow crystalline solid or liquid with a strong, pungent odor. It is volatile and slowly sublimes at ambient conditions. DCPD is widely used as a raw material for unsaturated polyester resins (UPR), epoxy resins, adhesives, inks, fragrances, pesticides, and resin modifiers. It also serves as a precursor for norbornene and other specialty resins, making it important in the production of automotive parts and structural composites.

A key feature of DCPD is its ability to undergo a retro-Diels–Alder reaction, decomposing back into cyclopentadiene upon heating. This reversible reaction is significant in various synthesis processes. Safety measures must be taken when handling DCPD, as it is flammable and its vapors can be harmful. It should be stored in sealed containers in a cool, well-ventilated area, away from ignition sources.

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