Intramolecular hydrogen bonds molecular packing

It should be noted that the PVA-based composite/blend membranes generally showed high potential for DMFC applications due to the better methanol barrier capability for PVA itself resulting from the dense molecular packing structure caused by inter- and intramolecular hydrogen bonding. " Kim group developed PVA-based nanocomposites modified with sulfonated mesoporous benzene-silicas and obtained... 

In the hydroxyl-rich environment of the molecular packing in the crystal, intramolecular bonding is sterically less favorable than the intermolecular hydrogen-bond formation that occurs in all the alditol crystal structures. 

Most organic species form molecular crystals in which discrete molecules are arranged in fixed positions relative to the lattice points. This of course means that the individual atoms making up the molecules are each arranged at fixed positions relative to each other, the lattice point, and the other molecules. The forces between molecules in molecular crystals are generally weak when compared with the forces within a molecule. The structure of molecular crystals is affected by both the intermolecular forces and the intramolecular forces since the shapes of the individual molecules will affect the way the molecules pack together. In addition, the properties of the individual molecule, such as the polarity, will affect the intermolecular forces. The forces between the molecules in molecular crystals include electrostatic interactions between dipoles, dispersion forces, and hydrogen bond... 

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