摘要:
The present invention relates to a novel catalytic system for polymerisation and, specifically, for preparing conjugated diene polymers with a polar function at the chain end. Said catalytic system is made up of a metal salt of a rare earth metal and, as an alkylating agent, an organometallic compound based on a metal from the second or thirteenth column of the periodic table, capable of transferring a polar function to the diene elastomer during the conjugated diene polymerisation step. The novel catalytic system reduces the steps required for synthesising a functional diene elastomer at the chain end, while guaranteeing optimal functionalisation, advantageously near or equal to 100%.
摘要:
The invention relates to a novel organometallic compound containing a divalent metal belonging to the second column of the periodic table, useful as an alkylating agent in a rare earth metal catalytic system. Said novel compound has formula (I), where: M is a metal belonging to the second column of the periodic table, selected among Be, Mg, Sr, Ba and Ra; R1, R2, R3, R4 are hydrogen atoms or alkyl or aryl substituents, optionally bonded together to form at least one ring system or at least one aromatic ring; R and R' denote alkyl or aryl substituents; L is a Lewis base; x is an integer from 0 to 4; m is an integer greater than or equal to 0; and n is an integer greater than or equal to 1.
摘要:
The subject of the invention is a method of synthesizing a compound MxPy with M being an element belonging to one of columns II to XV of the Periodic Table of the Elements or to the family of lanthanoids or to the family of actinoids, characterized in that it comprises: the reaction of x mol of compound comprising the element M in its 0 oxidation state with y/4n mol of compound (P4)n-. The method of the invention may be carried out at a temperature much lower than those necessary in the methods of the prior art; it also enables the formation of nanoparticles at low temperatures and stoichiometric reaction control. This method has many applications: magnetic ferromagnets for MnP and FeP, hydrodesulphurization catalysts for Ni2P, luminescent nanoparticles for biological applications, or in microelectronics and optoelectronics for InP, and electronics for GaP. The last two are also used in the field of photovoltaic energy.
摘要:
The subject of the invention is a method of synthesizing a compound MxPy with M being an element belonging to one of columns II to XV of the Periodic Table of the Elements or to the family of lanthanoids or to the family of actinoids, characterized in that it comprises: the reaction of x mol of compound comprising the element M in its 0 oxidation state with y/4n mol of compound (P4)n-. The method of the invention may be carried out at a temperature much lower than those necessary in the methods of the prior art; it also enables the formation of nanoparticles at low temperatures and stoichiometric reaction control. This method has many applications: magnetic ferromagnets for MnP and FeP, hydrodesulphurization catalysts for Ni2P, luminescent nanoparticles for biological applications, or in microelectronics and optoelectronics for InP, and electronics for GaP. The last two are also used in the field of photovoltaic energy.