Pyridine-containing polymers synthesis

Synthesis of pyridine-containing polymers by radical polymerization. 

Seyedjamali H, Puisedigh A (2011) Synthesis of well-dispersed polyimide/Ti02 nanohybrid films using a pyridine-containing aromatic diamine. Polym Bull 68(2) 299-308... 

Yasuda, T., Yamamoto, T. Synthesis and Characterization of new luminescent 1,10-phenanthroline- and pyridine-containing n-conjugated polymers. Their optical response to protic acid, M , and solvents. Macromolecules 36, 7513-7519 (2003)... 

Macallum reported that polymers prepared in this manner generally contained more than one sulfur atom per repeat unit (x in the range 1.0-1.3) (2). In addition the polymerization reaction was highly exothermic and difficult to control even on a small scale (3). Later Lenz and co-workers at Dow reported another synthesis of PPS (4,5,6) based on a nucleophilic substitution reaction involving the self-condensation of materials such as copper p-bromothiophenoxide. The reaction was carried out at 200-250°C under nitrogen in the solid state or in the presence of a reaction medium such as pyridine. It was quite difficult to remove the by-product, copper bromide, from polymers made by this process (7). These and other methods of polymerization have been reviewed by Smith (8). Polyphenylene sulfide resins have been described more recently by Short and Hill (9). 

The zinc enamine EtZn(Bu NHCH=CHNEtBu ), obtained from Et2Zn and Bu N=CHCH=NBu , forms dimeric zinc-aldolates on reaction with aldehydes. The dimeric zinc-aldolate fromp-HCOCsHtN forms a coordination polymer with Vi equivalent Et2Zn. The X-ray structure of the polymer, in which the pyridine nitrogens are coordinated to bridging Et2Zn units, shows the monomeric zinc-aldolate units to have a distorted boat conformation. The synthesis and characterisation of trimeric [1-EtZnNH-naphthalene.THF]3 (7) and [EtZnP(cyclohexyl)2]j.THF (8), have been described (7) contains 4-coordinate Zn and a cyclic Zn N3 core while in (8), which has a cyclic Zn3 3 ccrystal structure of (2-IZn-l,3-xylene)-1 S-crown-4 has also been reported. ... 

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