Poly , hyperbranched grafts

The poly(sodium acrylate) hyperbranched graft formed in a simple deprotonation was used to ionically immobilize enzymes. Studies showed that immobihzed glucose oxidase in a 3-poly(sodium acrylate)/Au film retained significant activity on immobihzation and that the enzyme in this ionic assembly remained active for more than 60 days of storage [30]. 

Scheme 2 Photolithographic process for preparing patterned hyperbranched grafts of poly(acrylic acid)...

Scheme 5 Polyvalent hydrogen bonding of a a soluble poly(N-isopropylacrylamide) to a 3-PAA/PE hyperbranched graft or b a soluble poly(acrylic acid) to a hyperbranched poly(Ar-isopropylacrylamide) graft on PE...

The chemistry and procedures for modification of the - CO2H groups of PAA hyperbranched grafts on PE powder were analogous to those used for PAA grafts on PE or PP films and wafers. For example, a 90% yield in ester formation was possible using acid-catalyzed Fisher esterification. Likewise, quantitative reduction (ethyl chloroformate activation, borane-dimethyl sulfide reduction) to hyperbranched poly(allyl alcohol)s and amidation all could be carried out using procedures like those used for PAA/Au surfaces. 

In work like that described in Scheme 6, Bruening reported the synthesis of multilayer composites by alternating deposition of Gantrez and the linear polyvalent nucleophile poly(allylamine) [58]. The impermeable films that were produced by this multistep hyperbranched graft chemistry were shown to passivate aluminum surfaces. 

To study the solution property of novel amphiphilic hyperbranched graft copolymer chains, we further prepared amphiphilic hyperbranched poly(acrylic acid) grafted with short polystyrene copolymer (HB-PAA- -PS) with a large hydro-phihc hyperbranched PAA core and short hydrophobic PS grafted chains. The copolymer chains with different branching degrees of PAA core were carefully prepared and well confirmed by SEC, H NMR, and FT-IR. As well, the... 

Hyperbranched poly(amidoamine)- " " grafted silica nanoparticle... 

Murota, M. Sato, S. Tsubokawa, N. (2002). Scale-up Synthesis of Hyperbranched Poly(amidoamine)-grafted Ultrafine Silica using Dendrimer Synthesis Methodology in Solvent-free Dry system. Polymers for Advanced Technology, 13,144-150... 

Poly(arylene ether ketone)s (PEKs), 327 block and graft copolymers of, 359-361 hyperbranched, 349 modification of, 354 synthesis of, 340-345, 360 Poly(arylene ether phosphine oxide)s (PEPOs), 345... 

Fig. 14. Hyperbranched polymer grafts prepared on a mercaptoundecanoic acid (MUA) self assembled monolayer confined to a gold substrate. PAAM-c-PAA represents a random copolymer of poly(acrylamide) and poly(acrylic acid) prepared from the poly(acrylic acid) carboxylic acid groups and an amine [129]...

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