BICYCLO[4.2.0]OCTA-1,3,5-TRIENE
benzocyclobutene
CAS: 694-87-1
Molecular Formula: C8H8
BICYCLO[4.2.0]OCTA-1,3,5-TRIENE - Names and Identifiers
BICYCLO[4.2.0]OCTA-1,3,5-TRIENE - Physico-chemical Properties
| Molecular Formula | C8H8 |
| Molar Mass | 104.15 |
| Density | 0.957 g/mL at 25 °C (lit.) |
| Boling Point | 150 °C/748 mmHg (lit.) |
| Flash Point | 97°F |
| Vapor Presure | 1.57mmHg at 25°C |
| Appearance | clear liquid |
| Color | Colorless to Almost colorless |
| Storage Condition | Sealed in dry,Room Temperature |
| Refractive Index | n20/D 1.541(lit.) |
BICYCLO[4.2.0]OCTA-1,3,5-TRIENE - Risk and Safety
| Risk Codes | 10 - Flammable |
| Safety Description | 16 - Keep away from sources of ignition. |
| UN IDs | UN 3295 3/PG 3 |
| WGK Germany | 3 |
| HS Code | 29029090 |
| Hazard Class | 3 |
| Packing Group | Ⅲ |
BICYCLO[4.2.0]OCTA-1,3,5-TRIENE - Reference Information
| NIST chemical information | information provided by: webbook.nist.gov (external link) |
| EPA chemical substance information | information provided by: ofmpeb.epa.gov (external link) |
| Use | benzocyclobutene (BCB) monomer has thermodynamic stability of aromatic compounds and kinetic reactivity of strained rings. After heating to 200 °c, the four-membered ring is opened and a highly active polymerizable intermediate is formed. The polymerizable intermediates may not only undergo a Diels-Alder addition reaction with the diolefin-based monomer, but may also react with each other to form a polymer. |
| ring-opening polymerization mechanism | due to the multifunctional reactivity, superior electronic and thermal properties of benzocyclobutene monomer, benzocyclobutene functional polymers are regarded as a new generation of high performance materials. The benzocyclobutene monomer has a four-membered ring structure maintained by stress. Under heating (greater than 200 ℃), the four-membered ring is opened, the benzocyclobutene monomer forms a highly reactive Conjugated Diene intermediate (O-quinodimethane). If there are different substituents on the four-membered ring of BCB, the ring opening temperature of the four-membered ring will decrease to different degrees [1]. The intermediate formed after ring opening of benzocyclobutene preferentially undergoes Diels-Alder addition reaction with the dioleophilic monomer in the presence of the dioleophilic monomer, if the dioleophilic monomer is not present, the intermediates may also react with each other to produce a Spiro intermediate, followed by a series of rearrangements to give polymers and oligomers. The ring-opening polymerization of the benzocyclobutene monomer does not require the addition of a catalyst and an initiator, and does not generate small molecule by-products during the reaction. |
Last Update：2024-04-09 21:11:58
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