Hydrogen-bonding polymers

KEY TERMS intermolecular forces hydrogen bonding polymer... 

A second monoclinic polymorph of anilinium picrate has been found, showing a three-dimensional hydrogen-bonded polymer with strong primary interactions between the proximal phenolate and adjacent nitro groups and separate anilinium... 

The proportion of the non-planar form of TINS in films of poly(vinylalcohol) (PVA) a protic, hydrogen-bonding polymer and poly(vinylpyrrolidone) (PVP) an aprotic, hydrogen-bonding polymer, is approximately 10% and 90% respectively (12). These results demonstrate that the polymer environment can have a profound effect on the preferred conformation of the stabilizer and thus influence its effectiveness in photostabilizing the substrate. 

Coleman MM, Painter PC. Hydrogen bonded polymer blends. Prog Polym Sci 1995 20 1 -59. 

Figure 5.11 The three distinct classes of hydrogen bonded polymer networks (a) self-associative polymer network, (h) polymer network synthesized via the use of complementary linker molecules, and (c) complementary polymer hlends.

Figure 5.12 Self-associative hydrogen bonded polymer networks based on (a) 2-ureido-4[lH]-pyrimidone (UPy), (b) 1,2,4-triazine, and (c) urazole carboxylic acid.

Xu H, Srivastava S, Rotello VM. Hydrogen bonded polymers. Berlin Springer-Verlag 2007. pp 179-198. 

This dependence of the strength of the silanol self-association on the substituents provided an approach for tailor-made miscibility in their binary hydrogen bonded polymer blends.10 A miscibility window was formed for ST-VPDMS/PBMA blends when the copolymers contained 4 to 34 mol % silanol groups." As a direct result of reduced silanol self-association in ST-VPMPS copolymers, a extended miscibility window was formed when ST-VPMPS copolymers contained 9 to 56 mol % silanol groups.12... 

Steed, J. W., McCool, B. J., Junk, P. C., Hydrogen bonded polymers and oligomers from metal salts and 18-crown-6. J. Chem. Soc., Dalton Trans. 1998, 3417-3423. 

To develop a system of linear templates to control the [2 + 2] cycloaddition in the solid state, we turned to crystal structure studies involving a bis(resorcinol) anthracene [19,20]. In particular, it had been shown that co-crystallization of a l,8-bis(resorcinol)anthracene with anthraquinone yielded a one-dimensional (1-D) hydrogen-bonded polymer wherein each resorcinol unit of the anthracene organized, by way of O-H O hydrogen bonds, two quinones in a face-to-face... 

Though not strictly functioning as resistors/conductors, carbon nanotubes have just been reported in an extraordinarily vapor-sensitive capacitive device [19]. The electric field lines emanating from the nanotubes are responsible for a localized dielectric response that can be modulated by minute quantities of adsorbate on the nanotube surface. A layer of hydrogen-bonding polymer, or even a mono-layer terminated in mildly acidic groups, increased sensitivity to parts per billion levels. Response strength was correlated with the dipole moment of the analytes. 

With the exception of l,6-naphthyridin-8-ols, nuclear hdyroxy-1,6-naphthyridines would be expected to exist as the corresponding naphthyridinones. This has been confirmed by infrared,1035 ultraviolet,1026 and nuclear magnetic resonance spectral means.639 Other physicochemical studies of these oxy-1,6-naphthyridines include IR stretching frequencies1019 and ionization constants1040 of 1,6-naphthyr-idin-8-ols the mass spectra of 1,6-naphthyridinones the effect of solvents on the UV spectrum of an 8-hydroxy-1,6-naphthyridine derivative 773 and X-ray analysis of the dilactam, 4-hexyl-3,4,4a,5-tetrahydro-l,6-naphthyridine-2,7(l//,6Z/)-dione (1), in connection with its crystallization as self-assembled hydrogen-bonded polymers.549... 

Column 1 includes the data for the three hydrogen-bonded polymers while Column 2 does not. 

It is important to note that the correlation coefficient is slightly increased in the case of the solubility parameter but decreased in the case of the parachor after the three hydrogen-bonded polymers were removed from the Tables. 

Critical surface tensions of functional polymers were experimentally determined. This set of data and the data on elastomers obtained previously were used to elucidate the proposed solubility parameter-surface tension relationship and the proposed parachor-surface tension relationship. The results show that the former has a higher correlation coefficient than the latter. The correlation coefficients, including three highly hydrogen-bonded polymers, are 0.731 for the former and 0.299 for the latter. Otherwise, they are 0.762 for the former and 0.178 for the latter. For the size of samples examined, we can conclude that the proposed solubility parameter-relationship is more effective than the proposed parachor-relationship in calculating critical surface tension of a polymer. 

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