Pyridine-containing polymers

C. Wang, M. Kilitziraki, J.A.H. MacBride, M.R. Bryce, L.E. Horsburgh, A.K. Sheridan, A.P. Monkman, and I.D.W. Samuel, Tuning the optoelectronic properties of pyridine-containing polymers for light-emitting devices, Adv. Mater., 12 217-222, 2000. 

A very interesting technique that has been used widely in the MTO-catalyzed olefin oxidation reaction is the microencapsulation technique. This technique uses poly(4-vinylpyridine) (PVP), either 2% or 25% cross-linked with divinylbenzene (PVP-2% or PVP-25%, Fig. 4), as well as poly(4-vinylpyridine-/V-oxide) (PVPN-2%, Fig. 4). In addition, 2% cross-linked PS (PS-2%, Fig. 4, X = CH2) and a mixture of PS-2% and PVP-2% (5 1, Fig. 4, X = N) have been used as support polymers. This approach is based on the physical envelopment of the Lewis-acidic MTO by the PS polymer, enhanced by interactions of the 7t-electrons of the phenyl rings with MTO. In the case of the pyridine-containing polymers, Lewis acid-Lewis base interactions between the pyridine moiety and MTO obviously play an important role. In the case of the PVP and PVPN polymers, MTO can be incorporated in the support matrix by mixing the polymer and MTO in ethanol to obtain the desired immobilized catalyst. 

FIGURE 9.1. Repeat units of the pyridine-containing polymers and other polymers used in the study (a) poly(p-pyridine) (PPy) (b) poly(/ -pyridyl vinylene) (PPPyV) (c) copolymer of PPY and PPyV [PPyVP(R)2V] (d) wrapped copolymer of pyridylvinylene and penylenevinylene ( PPyVPV) (e) wrapped copolymer of dithienylene and phenylene ( PTP) (f) emeraldine base (EB) form of polyaniline (g) sulfonated polyaniline (SPAN). 

Table II). However, the two pyridine-containing polymers remained as light-amber, glassy materials even after repeated precipitations. 

There have been studies indicating that blends of PBI polymers with pyridine-containing polymers could prove useful in a high-temperature PEM fuel cell. Kallitsis et al. [31] combined commercially supplied w-PBI with an aromatic polyether that contained a pyridine moiety in the main chain (PPyPO) these polymer blends were then soaked in 85% wt PA. Dynamic mechanical analysis of a 75/25 PBl/PPyPO block copolymer showed reasonable mechanical strength and flexibility. The conductivity of this copolymer was not reported, but the conductivity of 85/15 PBI/PPyPO block copolymer was 0.013 S cm at a relatively low PA doping level. Further investigation of these systems is required to prove its utility as a fuel cell membrane. 

Figure 1. Schematic units of the pyridine-containing polymers and other materials reported here.

Polymers containing pyridine moieties in the mainchain (13) are likewise obtainable by the reaction of the polymers (3) with nitriles (scheme 9). In this case, polymers containing pyridine moieties (about 80%) are produced with an increase of the molecular weight of the polymers. The increase of the molecular weight is most probably due to the pyridine formation of the nitriles with the acetylene moieties at the polymer end catalyzed by the eliminated ( n -cyclopentadienyl)cobalt(I). In fact, it is also possible to prepare pyridine-containing polymers directly from diynes and nitriles in the presence of catalytic amount of 4 (scheme 10). Within the examined combinations, this catalytic polymerization by the pyridine-ring-formation process is... 

Well-defined pyridine-containing polymers and copolymers with controlled molecular weight and narrow molecular weight distribution have a potential number of promising applications, for example as coordination reagents for... 

Synthesis of pyridine-containing polymers by radical polymerization. 

Pyridine-containing polymers can also be synthesized using the eondensation polymerization method. For example, a novel series of benzimidazole-containing sidfonated polyaiylene sulfones with a controllable amonnt of basic... 

Magdesieva TV, Dolganov AV, Yakimansky AV, Goikhman MY, Podeshvo IV (2009) New Cu(I) complexes with 2,2 -biquinolyl and 2,2 -quinolyl-pyridine containing polymer ligands as electrocatalysts for 02 activation in the oxidation of aliphatic amines. Electrochim Acta 54 1444-1451... 

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