Unimodal radial block copolymer possessing random graded chain and its preparation method
A block copolymer and radial technology, which is applied in the field of monomorphic radial block copolymer and its preparation, can solve the problems of long feeding time, inconspicuous gradient process, prolonged butadiene feeding time, etc., and achieve random High degree of chemistry, avoid gelation or other side effects
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[0043] In a jacketed 14L stainless steel reactor, the polymerization was carried out in a hydrocarbon solvent under the protection of argon. Continuous stirring of the reaction mixture is required during polymerization and coupling. Adding steps are as follows:
[0044] (1) monovinylarene monomer and initiator;
[0045] (2) A mixture of monovinylarene monomers and conjugated diene monomers (70% to 85% of the total weight of the mixture);
[0046] (3) A mixture of monovinylarene monomers and conjugated diene monomers (the remaining 15% to 30% mixture);
[0047] (4) conjugated diene monomer;
[0048] (5) Coupling agent.
[0049] After the coupling reaction is complete, water and CO 2 The coupled reaction mixture is treated and antioxidants are added prior to obtaining the polymer xylk of the invention. Table 1 shows the types of raw materials and additives used in Examples 1-10, and Table 2 shows the formulations and process conditions for preparing the copolymers of the p...
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