Production of random and block copolymers suitable for making fibers, films and moldings

摘要

Production of random copolymers from monomers S and B by anionic polymerization comprises: (a) using a mixture containing monomers S and B in given initial concentrations; (b) bringing this mixture into contact with the polymerization initiator I or a growing polymer chain PBI or PSI; and (c) adding the remainder of monomer B at a rate determined by repeated solution of given differential equations. Production of random copolymers from monomers S and B by anionic polymerization with a polymerization initiator comprises: (a) using a mixture containing monomers S and B in initial concentrations (S)0 and (B)0 given by equation (1); (b) initiating copolymerization by bringing this mixture into contact with the polymerization initiator I or a growing polymer chain PBI or PSI; and (c) adding the remainder of monomer B at a rate rz for time t given by repeated solution of differential equations (2) to (6); -dB/dt = -rz .(B)z + (kSB/V) . PSI . B + (kBB/V) . PBI . B (2) -dS/dt = (kBS/V) . PBI . S + (kSS/V) . PSI . S (3) -dPBI/dt = (kBS/V) . PBI . S - (kSB/V) . PSI .B (4) -dPSI/dt = (kSB/V) . PSI . B - (kBS/V) . PBI .S (5) -dV/dt = -rz - (1/ rho s - 1/ rho p) Ms . dS/dt - (1/ rho B - 1/ rho p) MB . dB/dt (6) s = the required fraction of monomer B in the copolymer in mol.%; kBB = the reaction velocity constant for addition of monomer B to the growing polymer chain PBI with a monomer B as last added monomer; kSS = the reaction velocity constant for addition of monomer S to the growing polymer chain PSI with a monomer S as last added monomer; kSB = the reaction velocity constant for addition of monomer B to the growing polymer chain PSI with a monomer S as last added monomer; kBS = the reaction velocity constant for addition of monomer S to the growing polymer chain PBI with a monomer B as last added monomer; V = the volume of polymerization mixture at the particular moment; (B)z = the concentration of monomer B in the feed; rho S, rho B = the density of monomers S and B; rho P = the density of the copolymer; MS, MB = the molar weight of monomers S and B; S, B = the amounts of S and B under conditions (7); d(B)/dt = (b/s) . d(S)/dt (7) Independent claims are also included for (a) the production of block or 3-block copolymers with a random copolymer block S/B produced by this process; and (b) copolymers produced by this process.