TAILIEUCHUNG - Branched Polymers I Episode 4

Tham khảo tài liệu 'branched polymers i episode 4', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | Dendrimers and Dendrimer-Polymer Hybrids Jacques Roovers1 Bogdan Comanita Institute for Chemical Process and Environmental Technology National Research Council Ottawa Ontario CANADA K1A 0R6 1 e-mail Abstract. The synthesis and study of dendrimers has been truly dramatic in the last ten years. This review gives a brief introduction to some of the key concepts and main synthetic strategies in dendrimer chemistry. The focus of the chapter is a survey of modern analytical techniques and physical characterization of dendrimers. Results of model calculations and experiments probing the dimensions and conformation of dendrimers are reviewed. In the final sections the experimental work on dendrimer-polymer hybrids is highlighted. The dense spherical conformation of dendrimers has been combined with the loose randomcoil conformation of ordinary polymers to form new hybrids with potentially interesting new properties. Keywords. Dendrimer Dendrimer-polymer hybrid Conformation Branched polymers List of Abbreviations and Symbols. 180 1 Introduction. 181 Dendritic Architecture. 181 Synthetic Highlights. 182 2 Analysis of Dendrimers. 187 NMR Analysis. 187 Mass Spectrometry . 187 Size Exclusion Chromatography. 193 3 Conformation of Dendrimers . 194 Theoretical Models. 194 Experimental Dimensions of Dendrimers. 195 Radius of Gyration. 195 Hydrodynamic Radii . 197 Effect of Solvent on Dendrimer Dimensions . 199 4 Dendrimer-Polymer Hybrids. 200 Polymeric Dendrimers . 200 Dendrimers on Polymers . 206 Advances in Polymer Science Springer-Verlag Berlin Heidelberg 1999 180 J. Roovers B. Comanita Dendrimers on Flexible Dendrimers on Stiff Backbones .208 Linear Polymers on Single Polymer-Dendrimer Multiple Polymer-Dendrimer Hybrids .216 5 Hybrids of Dendrimers and Biological Dendrimer-Peptide Dendrimer-DNA

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