Benzocyclobutene (BCB), CAS No. 694-87-1, is an aromatic bicyclic organic compound consisting of a benzene ring fused to a four-membered cyclobutane ring.it is an important compound in organic synthesis and materials chemistry because of its distinctive molecular structure and thermally activated ring-opening behavior. It serves as a useful chemical intermediate for preparing functionalized aromatic compounds, polymer precursors, and advanced crosslinkable materials.

The BCB structural unit has attracted particular interest in the electronics and semiconductor industries. Benzocyclobutene-based polymers are used in applications requiring low dielectric constants, low moisture absorption, good thermal stability, and reliable insulating properties.

The most important chemical characteristic of BCB is the combination of an aromatic ring and a strained four-membered ring. Its chemical behavior can be understood through several characteristics:

►Aromatic ring stability

►Ring strain

►Thermal ring-opening behavior

►Reactive intermediate formation

►Polymer-forming potential

BCB is a useful synthetic building block because its thermal ring-opening reaction provides access to reactive ortho-quinodimethane intermediates.these intermediates can participate in cycloaddition reactions and facilitate the construction of complex cyclic and polycyclic molecular structures.one of the most commercially significant areas associated with BCB chemistry is the development of benzocyclobutene-based polymers.

BCB-functionalized monomers and oligomers can undergo thermal curing to form highly crosslinked polymer networks.these materials offer several attractive characteristics:

►Low dielectric constant.

►Low moisture absorption.

►Good electrical insulation.

►Good thermal stability.

►Good chemical resistance.

►Excellent film-forming characteristics.

►Favorable planarization performance.

These properties make BCB-based polymers useful in advanced electronic materials.

Semiconductor and Microelectronics Industry

►Advanced Electronic Packaging

►Optical and Photonic Devices

►Advanced Functional Polymer Materials

Purity(GC): not less than 99%

Appearance: Colorless to almost colorless liquid

Boiling point: Approximately 150°C

Density: Approximately 0.96 g/mL at 25°C

Flash point: Approximately 36°C

Refractive index: Approximately 1.541

Product: BCB, CAS number 694-87-1,BCB polymer,BCB monomer,BCB resin