1、The hisotry and the idea1952: Flory calculated MWDs from ABx monomer, prediction of “highly branched” polymers;only 1 remaining A group per moleculemonomerx-merNumber of B:1+(f-2)x“Examples of branched polymers of the type underconsideration are few”P. J. Flory, in Priciples of polymer chemistry, p.
2、3631982: 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 Conclusion: Thus, for the first time a branched polycondensate was obtai
3、ned which did not crosslink regardless of the conversionMe3SiOMe3SiOCOClPioneer work by Kim and Webster1990:Three approaches Mori, H.; Mller, A. H. E. Topic in Current Chemistry 2003, 228, 1-37.Hyperbranched polyestersExamples: 2,2-bis(hydroxymethyl)propionic acidHyperbranched PPP & PPVHyperbranched
4、 polyamidesHyperbranched Si-containing polymersHyperbranched poly(phenylene sulfide)sHyperbranched poly(triphenylamine)sAB2 macromonomerHyperbranched polyethersSelf-condensing vinyl polymerizationinimerSCVP: polymn. process and product propertiesFrechet, J.M.J.; Grubbs, R. B. et al Science 1995, 269
5、, 1080.Inimer designMori, H.; Mller, A. H. E. Topic in Current Chemistry 2003, 228, 1-37.Inimer designMori, H.; Mller, A. H. E. Topic in Current Chemistry 2003, 228, 1-37.Inimer designMori, H.; Mller, A. H. E. Topic in Current Chemistry 2003, 228, 1-37.Molecular parameters of hyperbranched polymers0
6、11brtNNDBNDegree of Branching:dendrimer1DBlinear0DBNtNbrBranching factor:0brmNBFNNNlinearMolecular parameters of hyperbranched polymers00n01(1)1(1)NNDPNNpa fNumber averagedegree of polymerization:2nw1(1)1(1)DPafPDIDPa fMolecular weightdistribution:Polydispersity as a funciton of a and fMolecular par
7、ameters by SCVPMori, H.; Mller, A. H. E. Topic in Current Chemistry 2003, 228, 1-37.Very broad distributionSolution propertiesLow viscosity: Mark-Houwink-Sakurada equation KMMore compact conformation: Rg/RhContraction factor:g,branchedg,linearRgRbranchedlinear gat the same MWSolution properties: an
8、exampleMHS plot for a highly branched PMMAprepared by inimer techniqueSurface grafting with hyperbranched polymersMori, H.; Mller, A. H. E. Topics in Current Chemistry 2003, 228, 1-37.AFM observationProperty and application of hyperbranched polymersProperty and application of hyperbranched polymersOnly 1% of the hyperbranched compound can significantly increase the fracture strength of PMMA-based dental resin.Property and application of hyperbranched polymersProperty and application of hyperbranched polymersProperty and application of hyperbranched polymersHomework:
