Dendritic polymers properties

Comparison of Traditional Linear Polymer and Dendritic Polymer Properties... 

Staudinger H (1970) From organic chemistry to macnnnolecules. Wiley, New York Watson JD (1976) Molecular biology of the gene. W.A. Benjamin, Menlo Park Watson JD, Crick FHC (1953) Molecular structure of nucleic acids. Nature 171 4356 Tomalia DA, Dvomic PR, Uppuluri S, Swanson DR, Balogh L (1997) Skeletal macromo-lecular isomerism a comparison of dendritic polymer properties to those of classical mac-romolecular architectures. Polym Mater Sci Eng 77 95-96... 

Due to dieir compact, branched structure and to die resulting lack of chain entanglement, dendritic polymers exhibit much lower melt and solution viscosity dian their lineal" counterparts. Low a-values in die Mark-Houwink-Sakurada intrinsic viscosity-molar mass equation have been reported for hyperbranched polyesters.198 199 Dendrimers do not obey diis equation, a maximum being observed in die corresponding log-log viscosity-molar mass curves.200 The lack of chain entanglements, which are responsible for most of the polymer mechanical properties, also explains why hyperbranched polymers cannot be used as diermoplastics for structural applications. Aldiough some crystalline or liquid... 

Ceroni, P., Bergamini, G., Marchioni, F., and Balzani, V. (2005) Luminescence as a tool to investigate den-drimer properties. Prog. Polym. Sci. Vol., Dendrimers and Dendritic Polymers 30(3—4), March-April 2005, 453-473. 

The synthesis of well-defined LCB polymers have progressed considerably beyond the original star polymers prepared by anionic polymerization between 1970 and 1980. Characterization of these new polymers has often been limited to NMR and SEC analysis. The physical properties of these polymers in dilute solution and in the bulk merit attention, especially in the case of completely new architectures such as the dendritic polymers. Many other branched polymers have been prepared, e.g. rigid polymers like nylon [123], polyimide [124] poly(aspartite) [125] and branched poly(thiophene) [126], There seems to be ample room for further development via the use of dendrimers and hyperbran-... 

It is well known that dendritic polymers possess substantially different properties compared to their linear analogues [8], The exploration of dendritic polymers has been intensified by the desire to identify synthetic polymers with fundamentally new properties. 

Grohn, F., Bauer, B. J. and Amis, E. J. Characterization, modelling and applications of dendritic polymers, in Abstracts to the NIST Workshop on Properties and Applications of Dendritic Polymers. National Institute of Standards and Technology, Gaithersburg, MD, USA, 1998. 

Lee, S. C., Parthasarathy, R., Botwin, K., Kunneman, D., Rowold, E., Zobel, J., Beck, T., Miller, T. and Voliva, C. A. Biochemical and immunological properties of cytokines conjugated to dendritic polymers. Manuscript in preparation. 

Hopefully, the present collection of insights on dendritic polymers will serve to assist and enlighten those who are in quest of such new architecturally driven properties and behavior. 

If combs represent one extreme of the topological family of branched polymers, then another extreme is given by the case of dendritic polymers, which retain a branched structure at all timescales. The study of tree-like branched architectures is also motivated by the important commercial low density polyethylene (LDPE), which has remarkable rheological properties making it suitable for many processing operations [3]. 

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