Chain polarization, hydrogen bonds

We have formed many donor/acceptor pairs which preferentially hydrogen bond to one another in the presence of nitro or aniline groups, and which form polar hydrogen-bonded chains. These pairs are shown in Table ID. 

EXAMPLE 2.4 Proteins are polymers of polar and nonpolar amino acids the amino acid nnits in the polymer are called residues becanse when the peptide bond between an amino acid and a peptide is formed, water is removed in a condensation reaction, leaving a residne of the amino acid. Amino acid residnes that have polar side chains form hydrogen bonds with water so they are hydrophilic (Fig. 2-5). Nonpolar side chains of amino acid residnes do not form hydrogen bonds with water, so they do not dissolve readily in it they are said to be hydrophobic. Thns proteins tend to fold np so that their hydrophobic residnes are clnstered in an interior core, away from contact with the aqneons environment and the hydrophilic residnes tend to be arranged on the exterior interacting with water. Interactions also occnr with other proteins and other biomolecnles in general. 

OH PVOH 0.15 Strong polarity, hydrogen bonding between chains, crystalline... 

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