Process for preparation of block copolymers from vinylcarbazoles

Details Process for preparation of block copolymers from vinylcarbazoles Process for preparation of block copolymers from vinylcarbazoles

1975-02-19

1976-11-30

Tillman, Murray

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

C-metal

96 15, 260 336UA, 260885, 260886, C08L 5300, C08L 3102, C08L 2514, G03G 507

Patent

active

039949940

ABSTRACT:
Process for preparation of block copolymers having photoconductive segments derived from a vinyl monomer and segments derived from a second addition monomer; said addition polymer segment also possibly being photoconductive. A polymer is initially prepared from one of the above monomers whereby the terminal groups of the resultant polymer are capable of generation of free radicals. By the appropriate selection of reaction medium it is possible to use the above free radical generating polymer to initiate polymerization of the second monomer, the polymer of which thereafter precipitates. This polymerization continues in the solid phase thereby preventing free radical decay even after depletion of the second monomer. The free radicals of these "living" polymers are quenched by the addition to the reaction medium of a monomer preferably corresponding to the structural units of the free radical generating polymer. This "heterophase" polymerization system eliminates the need for separate extraction of homopolymer fractions and other impurities from the resultant block copolymer.

REFERENCES:
patent: 3594358 (1971-07-01), Moberly
patent: 3652724 (1972-03-01), Shimomura et al.
patent: 3676190 (1972-07-01), Landler et al.
patent: 3860674 (1975-01-01), Sheppard et al.

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