Polymers with pendant cyclic ether

Polymers with Pendant Cyclic Ether Groups... 

In many cases, reactive double bonds were introduced into the cyclic carbonate stmcture for subsequent cross-linking, epoxidation, or addition reactions.Polymers of six-membered cyclic carbonate with pendant allyl ether group... 

With the development of 3-(co-bromoalkyl)thiophenes, several crown ether functionalized PTs have been synthesized by Bauerle and coworkers. Electropolymerization was performed on mono-, bi-, and terthiophene monomers 65-67 substituted with pendant 12-crown-4 receptor tethered with alkyl chains [175-177]. While electropolymerization failed with 65, compounds 66, 67, and 68 were easily electro-polymerized and the chemosensing properties of the polymers were analyzed. Cyclic voltammetric analysis showed that addition of increasing amounts of Li, Na, or produces a positive shift of the oxidation potential of poly(66, n=5), while this effect is less pronounced for poly(67). On the other hand, whereas the CV of poly(68, n=5) is strongly affected by the presence of alkali ions, the lengthening of the alkyl spacer in poly(68, n = 10) produces a complete loss of ion sensitivity. Optical and spectroelectrochemical experiments revealed that the changes in electronic properties were due to hindered diffusion of the counteranions into the film during polymer oxidation [177]. 

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