研究生课件for copy-hyperbranched

1、FUDAN,Hyperbranched Polymers,FUDAN,The hisotry and the idea,1952: Flory calculated MWDs from ABx monomer, prediction of “highly branched” polymers;,only 1 remaining A group per molecule,monomer,x-mer,Number of B: 1+(f-2)x,“Examples of branched polymers of the type under consideration are few” P. J.

2、Flory, in Priciples of polymer chemistry, p.363,FUDAN,Some pioneer work,1982: New polymer syntheses: 6. Linear and branched poly(3-hydroxy-benzoates) Hans R. Kricheldorf, Qui-Zhen Zang and G. Schwarz Institut fr Angewandte Chemie der Universitt, Martin-Luther-King-Platz 6, 2000-, Hamburg 13, FRG Con

3、clusion: Thus, for the first time a branched polycondensate was obtained which did not crosslink regardless of the conversion,Pioneer work by Kim and Webster,FUDAN,1990:,Three approaches,FUDAN,Mori, H.; Mller, A. H. E. Topic in Current Chemistry 2003, 228, 1-37.,Hyperbranched polyesters,FUDAN,Exampl

4、es:,2,2-bis(hydroxymethyl)propionic acid,FUDAN,Hyperbranched PPP Grubbs, R. B. et al Science 1995, 269, 1080.,Inimer design,FUDAN,Mori, H.; Mller, A. H. E. Topic in Current Chemistry 2003, 228, 1-37.,Inimer design,FUDAN,Mori, H.; Mller, A. H. E. Topic in Current Chemistry 2003, 228, 1-37.,Inimer des

5、ign,FUDAN,Mori, H.; Mller, A. H. E. Topic in Current Chemistry 2003, 228, 1-37.,Molecular parameters of hyperbranched polymers,FUDAN,Degree of Branching:,Nt,Nbr,Branching factor:,Nlinear,FUDAN,Molecular parameters of hyperbranched polymers,Number average degree of polymerization:,Molecular weight di

6、stribution:,Polydispersity as a funciton of a and f,FUDAN,Molecular parameters by SCVP,FUDAN,Mori, H.; Mller, A. H. E. Topic in Current Chemistry 2003, 228, 1-37.,Very broad distribution,Solution properties,FUDAN,Low viscosity: Mark-Houwink-Sakurada equation,More compact conformation: Rg/Rh,Contract

7、ion factor:,at the same MW,Solution properties: an example,FUDAN,MHS plot for a highly branched PMMA prepared by inimer technique,FUDAN,Surface grafting with hyperbranched polymers,Mori, H.; Mller, A. H. E. Topics in Current Chemistry 2003, 228, 1-37.,FUDAN,AFM observation,Property and application of hyperbranched polymers,FUDAN,Property and application of hyperbranched polymers,FUDAN,Only 1% of the hyperbranched compound can significantly increase the fracture strength of PMMA-based dental resin.,Property and application of hyperbranched polymers,FUDAN,Proper