Comb-branch

Scheme 6 Representative examples of hyperbranched base polymers used for sialic acid attachment and subsequent inhibition of flu virus infection. 14 Poly(ethyleneimine) (PEI) backbone 15 comb-branch polymer 16 dendrigraft polymer 17 PAMAM scaffolded on PEI...

Pannell (38) has correlated the intrinsic viscosities of comb-branched polystyrenes with calculated rather than measured values of . He finds that... 

To obtain improved ionic mobility, and thus high conductivity, alternative polymer structures have been developed, for example comb-branched block copolymers such as poly[bis(methoxy ethoxy ethoxide)], usually known as MEEP. Room temperature conductivities of MEEP-based polymer electrolytes of the order of 10-5 S/cm have been achieved, values... 

Since a branched polymer has more than two chain ends, the determination of both the thickness of the adsorbed polymer and the adsorbance is of particular interest. Kawaguchi and Takahashi106) investigated well-characterized comb-branched polystyrene adsorbed on a chromium plate from cyclohexane solution at the theta point by ellip-sometry and compared the results with those for the corresponding linear polystyrene. 

Comb-branched polymers, e.g., poly[2-(2-methoxyethoxy)ethylglyci-dyl ether] [383], metacrylate-based polymers [384],... 

Zeng F, Shen Y, Zhu S, Pelton R. (2000) Synthesis and Characterization of Comb-Branched Polyelectrolytes. 1. Preparation of Cationic Macromonomer of 2-(Dimethylamino)ethyl Methacrylate by Atom Transfer Radical Polymerization. Macromolecules 33 1628-1635. 

O—, /> = 4. (c) poly(vinyl acetate), o, comb-branched O—, randomly branched (d) polystyrene, star-branched, p as shown. The heavy lines represent the position of data for linear polymers. The light lines give the behavior predicted for branched pol5miers according to Eq. (2.6)... 

Scheme 16 Schematic representation of novel hyperbranched glycostructures illustrating regularly interspaced ligands onto poly(ethyleneimine) backbone (75), comb-branch (GO) structure (76), interspaced spheroidal dendrimer (77), rod-shaped, cylindrical polymer with dendritic branch (78), and dendrigraft (79).

Preliminary results of the dynamic measurements on solutions of comb-branched polystyrene (104) suggest that the Zimm-Kilb theory can not be applied. The longest relaxation time observed is much longer than predicted by the theory. 

---