Complex Polymer Architectures

Polymerization of 2,4-hexadiene in the presence of 1,2-disubstituted olefins gives telechelic polyacetylenes [180]. This method was used to prepare polyacetylene oligomers terminated with alkyl groups, silanes, and esters. 

Amorphous, hydrophobic telechelic diols, which may be used in hydrolysis-and UV-resistant polyurethanes, have also been synthesized by ADMET [181]. ADMET polymerization and subsequent hydrogenation of a ew-dimethyl substituted a,m-diene produced the hydrocarbon backbone, which was end-capped by chain termination reactants having a varied number of methylene units between their olefin and alcohol precursor group. This resulted in 2.0 functional telechelics with good molecular weight control. 

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The synthesis of complex polymer architectures by ATRP (or other living radical polymerizations) is useful but relatively restricted because the occurrence of bimolecular termination increases with the number of initiator sites on a polymeric species. 

This chapter will serve to highlight recent advances in polymer science that have been aided by the use of click chemistry. The copper(l)-catalyzed azide-alkyne cycloaddition (CuAAC) and thiol-ene reactions will be discussed first, after which the utilization of these chemical transformations in the construction and fimction-ahzation of a multitude of different polymeric materials will be outlined. Particular attention will be focused on the preparation of highly complex polymer architectures, such as dendrimers and star polymers, which exempHfy the essential role that chck chemistry has assumed in the polymer science community. 

Hyperbranched Polymers Synthetic Methodology, Properties, and Complex Polymer Architectures... 

Binder K, Butt H-J, Floudas G, Frey H, Hsu H-P, Landfester K, Kolb U, Kiihnle A, Maskos M, Mullen K, Paul W, Schmidt M, Spiess HW, Vimau P Structure formation of polymeric building blocks complex polymer architectures. Adv Polym Sci, in press doi 10.1007/ 12 2013 230... 

In the last section (Sect. 6) we focus on molecules adsorbed to surfaces. Creating complex polymer architectures on surfaces is important for applications such as (bio)sensors and molecular electronics. However, molecular self-assembly usually relies on weak, reversible interactions leading to inherently fragile structures. To provide stability as well as enhanced electron transport properties we explore the possibility of creating covalently linked molecular structures on bulk insulator surfaces. 

Structure Formation of Polymeric Building Blocks Complex Polymer Architectures 125... 

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