Boltorn hyperbranched polymer

Parquette et al. reported on a disaccharide synthesis on a hyperbranched polyester support (Boltorn hyperbranched polymer) (16) (Fig. 7.9) [44]. This polymer was obtained in a one-step synthesis and offers low cost, high-loading capacities (8.8 mmol OH-groups g ), and the intermediates were soluble in most aprotic solvents. 

The use of aliphatic monomers for hyperbranched polyesters has been debated because aliphatic monomers are said to be prone to thermal degradation reactions such as decarboxylation, cyclization, or dehydration [77]. The only commercial hyperbranched polymer is a hydroxy-functional aliphatic polyester, Boltorn, available from Perstorp AB, Sweden. 

Scheme 7.4 Disaccharide synthesis using a hyperbranched polymer (Boltorn polymer) as a soluble support.

Commercially available hyperbranched polymers possess in some cases lowmolecn-lar weights and are nsnaUy less defined with broad molecnlar weight distribntions. Examples are poly(ethylene imine) (BASF), Boltorn polyesters (Perstorp), polyglycerol (Hyperpolymers) and Hybrane polyesteramides (DSM)... 

Toughened epoxy resins and epoxy nanocomposite systems were synthesized using DGEBA resin, diethylene famine hardener, octadecylammonium modified montmorillonite and epoxy functional dendritic hyperbranched polymer (Boltorn El, Perstorp Spedahty Chemicals, Sweden) with an epoxy equivalent weight of 875 g/eq and a molecular weight of 10500 g/mol. 

Domanska, U. and Zrfek-Tryznowska, Z. (2010) Measurements of mass-fraction activity coefficient at infinite dilution of aliphatic and aromatic hydrocarbons, thiophene, alcohols, water, ethers, and ketones in hyperbranched polymer, Boltorn H2004, using inverse gas chromatography. J. Chem. Thermodyn., 42, 363—370. 

Xiao and co-workers have constructed unimolecular micelles from the biocompatible hyperbranched polymer Boltorn , modified with poly(L-glutamate) and PEG chains... 

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