Ionic dendritic structures

The crystallization of the PEO can be reduced by forming dendritic structures, and the branched side chains of the polyphosphazene can also inhibit the crystallization. When the number of -(CH2CH2O)- units in each chain is increased, the ionic conductivity does not increase greatly when compared with the introduction of the nonlinear polj hosphazene side chains. Due to the mutual penetration of the side chains, the mechanical stability is greatly improved. 

Structure controlled dendritic polymers that have been studied using gel electrophoresis generally behave as mimics of either proteins or nucleic acids, and possess similar ionic groups such as -NH3 , -COO , or P04 functionality. Dendrimer structures may be widely modified as a function of their interior composition and as well as the nature of their surface groups. Depending on their structure, the influence of pH may vary dramatically for different dendrimers. 

Ramzi, A. Scherrenberg, R. Joosten, J. Lemstra, P. Mortensen, K. Structure-property relations in dendritic polyelectrolyte solutions at different ionic strength. Macromolecules 2002, 35, 827-833. 

Micellar cubic (OD), hexagonal columnar (ID), lamellar (2D), and bicontin-uous cubic (3D) nanostructures are formed by self-assembly of 13. For the complexes with IiC104, the ionic conductivities show discontinuous changes following the phase transitions with change of temperature or molecular structure of the dendritic moiety. For example, the conductivity of the complex of 13 with LiC104 drops from 4.6 x 10 6 to 1.2 x 10 9 S cm, along the phase transition from crystalline lamellar to micellar cubic phases. 

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