摘要:
A process for the telomerization of butadiene comprises reacting 1,3-butadiene and an alkanol, in the presence of a catalyst promoter and an alkoxydimerization catalyst comprising a Group VIII transition metal and a triarylphosphine ligand, which includes one phenyl that is mono-ortho-alkoxy substituted and at least one other phenyl including at least one substituent that withdraws electrons from the phosphorus atom. The product includes an alkoxy-substituted octadiene, which may then be used to produce 1-octene. The catalyst shows improved stability, activity and selectivity toward the alkoxy-substituted octadiene.
摘要:
Disclosed herein are processes for preparing carbon fibers, comprising: sulfonating a polymer fiber with a sulfonating agent that is fuming sulfuric acid, sulfuric acid, chlorosulfonic acid, or a combination thereof; treating the sulfonated polymer with a heated solvent, wherein the temperature of the heated solvent is at least 95° C.; and carbonizing the resulting product by heating it to a temperature of 501-3000° C. Carbon fibers prepared according to these methods are also disclosed herein.
摘要:
Olefin polymerization catalyst systems are provided that include a procatalyst component having a metal-ligand complex of Formula (I): [formula] (I) where each X is a neutral, monoanionic, or dianionic, monodentate or polydentate ligand such that the complex of Formula (I) is neutral; each R1 and R10 is a (C6-C40)aryl, substituted (C6-C40)aryl, (C3-C40)heteroaryl, or substituted (C3-C40)heteroaryl; each R2, R3, R4, R7, R8, and R9 is a hydrogen; (C1-C40)hydrocarbyl; substituted (C1-C40)hydrocarbyl; (C1-C40)heterohydrocarbyl; substituted (C1-C40)heterohydrocarbyl; halogen; or nitro (NO2) group; and each R5 and R6 is a (C1-C 40 )alkyl; substituted (C1-C40)alkyl; or [(Si)1-(C+Si)40] substituted organosilyl. Additionally, olefin-based polymers and processes for polymerizing one or more olefin-based polymers in the presence of the olefin polymerization catalyst systems are also provided.
摘要:
The present disclosure describes a method for preparing a carbonized article comprising providing a fabricated polyolefin article; crosslinking the fabricated article with a boron-containing species (BCS); stabilizing the fabricated article by air oxidation; and carbonizing the fabricated article. The present disclosure further describes preparing a stabilized article.
摘要:
In one instance, the present disclosure describes a method for preparing a carbonaceous article comprising: providing a crosslinked polyolefin fabricated article; stabilizing the crosslinked polyolefin fabricated article by air oxidation to provide a stabilized fabricated article; treating with a boron-containing liquid (BCL) during or intermediate to at least one of the preceding steps; and carbonizing the stabilized fabricated article. In one instance the present disclosure describes a method for preparing a stabilized article.