Polymers with hydrogen bond chains

Figure 1.7. Mobility of hydrocarbon chain. The diagram shows mobility of a polymer chain composed of carbon atoms attached by single bonds with hydrogen side chains. Rotational freedom of the single carbon-to-carbon bonds allows hydrogen atoms to rotate freely about the backbone.

Binder, VP. H. and Zirbs, R. Supramolecular Polymers and Networks with Hydrogen Bonds in the Main- and Side-Chain. Vol. 207, pp. 1-78... 

Binder WH, Zirbs R. (2007) Supramolecular polymers and networks with hydrogen bonds in the main- and side-chain. Adv. Polym. Sci. 207 1-78. 

Polyglycine, H(-CO-CH2-NH)n-H, is the simplest polypeptide. It has two solid state structures. Form I consists of chains of polymer that are hydrogen-bonded into two-dimensional sheets. This form (including selectively deuterated isotopomers) has been studied by INS [53-55]. The spectra were interpreted similarly to those of N-methylacetamide. Reexamination of the spectra with periodic-DFT calculations is necessary. Acetanilide, C6H5-NH-C(=0)-CH3, forms hydrogen-bonded chains similar to N-methylacetamide and as such is a potential model for phenyl substituted peptides. However, the interest in acetanilide is that the... 

The growth of gold, palladium, and platinum nanoparticles in the nanostructured matrix of poly(octadecylsiloxane) (PODS) was demonstrated by Bronstein et al.102 PODS, an amphiphilic polymer with nonpolar alkyl chains and hydrophilic silanol moieties (—SiOl OH) forms a bilayer nanostructure composed of these two moieties in its hydrated form. In the presence of an aqueous solution of metal salt (e.g., Na2PdCl4, K2PtCl4, AuC13), the siloxy layer absorbed metal anions by hydrogen bonding (Scheme 5.9). After reduction, the metal ions were reduced into nanoparticles, and TEM results revealed that the nanoparticles were distributed in layer structures. The sizes of the particles were measured to be about 1-2 nm, and the narrow size distribution was attributed to the volume availability within the ordered bilayers of PODS. 

Liquid crystalline imprinted materials have been synthesized (Fig. 24) from polysiloxanes with mesogenic side-chains. In some of them, acetophenone was chosen as template and was covalently linked to the mesomorphous network via a ketal link [ 199]. In the others, the templates (carbobenzoxy-L-phenylala-nine, 1,8-diaminonaphthalene or theophylline) were in interaction with the mesomorphous polymer via hydrogen bonding [200]. All the imprinted networks were obtained as dense membranes. 

---