The present disclosure relates to the technical field of preparation of syndiotactic 1,2-polybutadiene (s-PB), in particular to a catalytic system and use thereof, and a preparation method of s-PB. In the present disclosure, the catalytic system includes an iron-containing organic compound, an azodicyano compound, an organoaluminum compound, and a free radical scavenger; where an iron element in the iron-containing organic compound, the azodicyano compound, the organoaluminum compound, and the free radical scavenger have a molar ratio of 1:(0.5-10):(5-100):(1-1000); and the free radical scavenger is selected from the group consisting of a sterically hindered phenol, a sterically hindered amine, and a phosphorus-containing antioxidant. The catalytic system can prepare the s-PB with a high activity at a high temperature, and the s-PB has a melting point of 60° C. to 130° C. with an extremely low gel content or even no gelation.

The time when at least a monomer and a chain transfer agent are supplied in a reactor and the solution temperature in the reactor has reached a predetermined polymerization temperature is set as starting time (T.sub.0), and the time when a process to terminate the polymerization is started is set as ending time (T.sub.1). A polymerization initiator is supplied into the reactor between (T.sub.0) and just before [(T.sub.1)−(T.sub.0)/2] and between [(T.sub.1)−(T.sub.0)/2] and (T.sub.1). The total mass of the polymerization initiator supplied to the reactor between (T.sub.0) and (T.sub.1) is set as (I.sub.A), and the total mass of the polymerization initiator supplied between [(T.sub.0−T.sub.1)/2] and (T.sub.1) is set as (I.sub.B). The (I.sub.A) is set 50 to 100 mass % of the entire polymerization initiator. Using a production method in which 0.50<(I.sub.B)/(I.sub.A)<1.00 is satisfied, a polymer is produced at a high polymerization rate showing less variation of molecular weight and having less amount of chain transfer agent residue remaining at an end of the polymer chain.

The invention relates to a process for the synthesis of a polymer bearing one or more pendant hydroxyaryl groups comprising the reaction of a polymer bearing one or more pendant epoxide functional groups with a nucleophilic compound bearing the hydroxyaryl group.

The invention relates to a process for the synthesis of a polymer bearing one or more pendant hydroxyaryl groups comprising the reaction of a polymer bearing one or more pendant epoxide functional groups with a nucleophilic compound bearing the hydroxyaryl group.

The present invention is a method for producing a conjugated diene polymer comprising polymerizing at least a conjugated diene monomer using a living radical polymerization method to produce a conjugated diene polymer that comprises a halogen atom at a terminal of a polymer chain, a living radical polymerization reaction being initiated using a copper salt, a multidentate ligand that comprises a nitrogen atom having an sp.sup.2 hybridized orbital as a coordinating atom, and an organic halide, to produce the conjugated diene polymer having a number average molecular weight (Mn) of 1,000 to 1,000,000 and a molecular weight distribution (Mw/Mn) of less than 2.0. The present invention provides a method for efficiently and inexpensively producing a conjugated diene polymer that includes a halogen atom at the terminal of the polymer chain, and has the desired molecular weight and a narrow molecular weight distribution.

The present invention is a method for producing a conjugated diene polymer comprising polymerizing at least a conjugated diene monomer using a living radical polymerization method to produce a conjugated diene polymer that comprises a halogen atom at a terminal of a polymer chain, a living radical polymerization reaction being initiated using a copper salt, a multidentate ligand that comprises a nitrogen atom having an sp.sup.2 hybridized orbital as a coordinating atom, and an organic halide, to produce the conjugated diene polymer having a number average molecular weight (Mn) of 1,000 to 1,000,000 and a molecular weight distribution (Mw/Mn) of less than 2.0. The present invention provides a method for efficiently and inexpensively producing a conjugated diene polymer that includes a halogen atom at the terminal of the polymer chain, and has the desired molecular weight and a narrow molecular weight distribution.

A method for producing a polydiene, the method comprising of combining a lanthanide compound, an alkylating agent, a halogen source, and optionally conjugated diene monomer to form an active preformed catalyst; independent of step (i), introducing an amine with conjugated diene monomer to be polymerized; independent of step (i), introducing the active preformed catalyst to the conjugated diene monomer to be polymerized to form an active polymerization mixture, where the active polymerization mixture includes less than 10% by weight, based on the total weight of the active polymerization mixture, of a solvent; and allowing the monomer to be polymerized to polymerize in the presence of the amine.

A method for producing a polydiene, the method comprising of combining a lanthanide compound, an alkylating agent, a halogen source, and optionally conjugated diene monomer to form an active preformed catalyst; independent of step (i), introducing an amine with conjugated diene monomer to be polymerized; independent of step (i), introducing the active preformed catalyst to the conjugated diene monomer to be polymerized to form an active polymerization mixture, where the active polymerization mixture includes less than 10% by weight, based on the total weight of the active polymerization mixture, of a solvent; and allowing the monomer to be polymerized to polymerize in the presence of the amine.

Production of monodisperse spherical granules of divinylbenzene co-polymers, used as sorbents, utilizes precipitative polymerization of divinylbenzene with substituted styrenes or derivatives of acrylic acid in the environment of acetonitrile in presence of an initiator and a stabilizer at the temperature ranging from 50 ° C. to 82 ° C. and mixing. Amides of aliphatic carbonic acids are used as low-molecular stabilizers, with the common formula: ##STR00001##
where R.sub.1 is an alkyl with 5 to 10 carbon atoms, an aryl alkyl with 7 to 10 carbon atoms; R.sub.2 R.sub.3 is an alkyl with 1 to 4 carbon atoms, or biradical with 3 to 5 carbon atoms; m ia a total number of carbon atoms in the direct or branched chain ranging from 2 to 14; the concentration of the stabilizer in the reaction mixture is from 2.Math.10.sup.−3 to 0.2 mole/1; the size of the monodisperse microspheres ranges between 0.2 and 4.0 micron.

Production of monodisperse spherical granules of divinylbenzene co-polymers, used as sorbents, utilizes precipitative polymerization of divinylbenzene with substituted styrenes or derivatives of acrylic acid in the environment of acetonitrile in presence of an initiator and a stabilizer at the temperature ranging from 50 ° C. to 82 ° C. and mixing. Amides of aliphatic carbonic acids are used as low-molecular stabilizers, with the common formula: ##STR00001##
where R.sub.1 is an alkyl with 5 to 10 carbon atoms, an aryl alkyl with 7 to 10 carbon atoms; R.sub.2 R.sub.3 is an alkyl with 1 to 4 carbon atoms, or biradical with 3 to 5 carbon atoms; m ia a total number of carbon atoms in the direct or branched chain ranging from 2 to 14; the concentration of the stabilizer in the reaction mixture is from 2.Math.10.sup.−3 to 0.2 mole/1; the size of the monodisperse microspheres ranges between 0.2 and 4.0 micron.