Accordion polymers

Synthesis. The most facile synthetic scheme found for making the accordion polymers involves a Knoevenagel condensation polymerization of two precursors. One is a bis-aldehyde precursor which will form the electron-donating ends of a pair of linked chromophores, e.g. ... 

Figure 2. Two repeat units of the original rra/u-accordion polymer, 1...

Heterolayer hBK Films from Accordion Polymer Bilayers... 

Figure 6. Idealized structure of a complementary pair of accordion polymers in a polar bilayer.

New mainchain syndioregic (accordion) polymers were synthesized, demonstrating the feasibility of incorporating different kinds of chromophores into polymers with this topology. With the appropriate chemistry, we believe it will be possible to make polymers with higher 33 coefficients, glass transition temperatures and thermal... 

Accordion polymers bilayer schematic, 143/ characterization by NMR, 136-137 corona poling and optical measurements, 137-139 a-cyanocinnamoyl chromophore, 135-136,147... 

Accordion polymers—Continued orientational and chemical stability, 139 synthesis by Knoevenagel condensation polymerization, 135-136 waveguide construction, 139-140 Aluminum metal electrode, deposition on polymer in LED, 411,412/ Aromatic amine-containing polymers dye-dispersed poly(N-vinylcarbazole), 387, 390-393... 

Folded accordion polymers are another example of main-chain polymers with transverse orientation of the chromophore [85, 86],... 

Ferrocene polymers with nonlinear optical properties were also prepared via Knoevenagel polycondensation reactions. " Scheme 32 shows the reaction of monomer 123 with 124 to give the accordion polymer 125 with values ranging from 9100 to 26,600." A mixture of A and Z isomers was initially obtained however, an isomerically enriched polymer (98% E isomer) could be isolated through selective precipitation. 

In order to overcome this problem a new series of accordion polymers have been recently synthesized... 

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