Functionalization of poly(arylenevinylene) polymers for integrated circuits
View Patent ↗A method is provided for modifying a poly(arylene vinylene) or poly(heteroarylene vinylene) precursor polymer having dithiocarbamate moieties by reacting it with an acid and further optionally reacting the acid-modified polymer with a nucleophilic agent. Also provided are novel polymers and copolymers bearing nucleophilic side groups which are useful as components of electronic devices, e.g. in the form of thin layers.
1. A method for modifying a polymer having dithiocarbamate moieties, the method comprising a step of reacting a polymer with an acid whereby a modified polymer is obtained, wherein the polymer prior to modification is represented by the structural formula (I)
wherein:
Ar is arylene or heteroarylene, wherein Ar is unsubstituted or substituted with one or more substituents independently selected from the group consisting of C 1-20 alkyl, C 1-20 alkoxy, C 1-20 alkylsulfate, aryl and aryl-C 1-4 alkyl;
R 1 and R 2 are independently selected from the group consisting of C 1-20 alkyl, C 3-10 cycloalkyl, aryl, aryl-C 1-20 alkyl and heterocyclyl;
R 3 and R 4 are independently selected from the group consisting hydrogen, C 1-20 alkyl, C 3-10 cycloalkyl, aryl, aryl-C 1-4 alkyl and heterocyclyl; and
n is such that a number average molecular weight of the polymer is from 5000 to 1000000 Dalton.
2. The method according to claim 1 , wherein the modifying is a functionalization of the polymer.
3. The method according to claim 2 , wherein the modifying is forming a conjugated polymer or substituting at least a part of the dithiocarbamate moieties to thereby introduce another functionality.
4. The method according to claim 2 , wherein the modifying comprises protonation of at least a part of the dithiocarbamate moieties.
5. The method according to claim 1 , wherein the acid is used in an amount of from 0.1 to 3 molar equivalents of the dithiocarbamate moieties present in the polymer.
6. The method according to claim 1 , wherein reacting said polymer with said acid is performed at a temperature of from −30° C. to +130° C.
7. The method according to claim 1 , wherein reacting said polymer with said acid is performed at a temperature of from 20° C. to 100° C.
8. The method of claim 1 , wherein the modified polymer is represented by the structural formula (II)
9. The method according to claim 1 , wherein Ar is selected from the group consisting of 1,4-phenylene; 2,6-naphthalenediyl; 1,4-naphthalenediyl; 1,4-anthracenediyl; 2,6-anthracenediyl; 9, 10-anthracenediyl; 2,5-thienylene; 2,5-furanediyl; 2,5-pyrrolediyl; 1,3,4-oxadiazole-2,5-dyil; 1,3,4-thiadiazole-2,5-diyl; 2,3-benzo[c]thienylene; thieno[3,2-b]thiophene-2,5-diyl; pyrrolo[3,2-b]pyrrole-2,5-diyl; pyrene-2,7-diyl; 4,5,9, 10-tetrahydropyrene-2,7-diyl; 4,4′-bi-phenylene; phenantrene-2,7-diyl; 9,10-dihydrophenantrene-2,7-diyl; dibenzofurane-2,7-diyl; and dibenzothiophene-2,7-diyl.
10. The method according to claim 1 , further comprising a step of reacting the modified polymer with a nucleophile agent, whereby a post-functionalized polymer is obtained.
11. The method according to claim 10 , wherein the nucleophile agent is selected from the group consisting of alcohols, thiols, phenols, thiophenols, dialkylsulfurs, aminoalkanes, anilines, carboxylic acids, carboxylic aldehydes, carboxylic acid esters, thiocarboxylic acids and esters thereof, xanthates, carboxylic acid amides, amino-acids, peptides, nucleosides, heterocyclic bases, alkaloids and modified DNA.
12. The method according to claim 10 , wherein the post-functionalized polymer is a polymer or copolymer comprising repeating units represented by the structural formula (III),
wherein Nu is a monovalent group derived from the nucleophile agent.
13. The method according to claim 12 , wherein Nu is selected from the group consisting of OR 5 , SR S , NHR 6 , OC(O)R 5 , SC(O)R 5 , and wherein each of R 5 and R 6 is independently selected from the group consisting of C 1-20 alkyl, C 2-20 alkenyl, and aryl.
14. The method according to claim 10 , wherein the nucleophile agent is reacted in an amount of from 0.1 to 10 molar equivalents of the dithiocarbamate moieties present in the polymer represented by the structural formula (I).
15. The method according to claim 1 , wherein the acid exhibits a pKa from −10 to +11.
16. The method according to claim 1 , wherein the acid exhibits a pKa from −3 to +4.
17. The method according to claim 1 , wherein the acid exhibits a pKa of about +4.
18. The method according to claim 1 , wherein the acid is an organic acid selected from the group consisting of carboxylic acids, phosphonic acids, sulfonic acids, and mixtures thereof.
19. The method according to claim 1 , wherein the acid is an inorganic acid.