Rheological behaviour of polymer blends containing only hyperbranched polyesters of varying generation number

Effect of tall oil fatty acids content on the properties of novel hyperbranched alkyd resins

“…5 Hyperbranched polymers that are based on bisMPA (extender) and ethoxylated pentaerythritol (core), are the commercially available Boltorn Hx polyesters: where x denotes the pseudogeneration number (Perstorp Specialty Chemicals AB, Sweden). 4,12 One of the most widely investigated families of hyperbranched polymers are the hydroxylated hyperbranched polyesters, which are synthesized from 2,2-bis(methylol)-propionic acid and different core molecules (e.g., tris (methylol)propane or ethoxylated pentaerythritol 3,14 ). The properties of hyperbranched polymers are strongly determined by the nature of their terminal groups.…”

Modification of bisphenol-A based bismaleimide resin (BPA-BMI) with an allyl-terminated hyperbranched polyimide (AT-PAEKI)

“…Several recent studies have revealed that the addition of a hyperbranched polymer could lower the viscosity of the polymer melts. Hsieh [12] studied the rheology the blends of Boltorn H w HBPs with different molecular weights. Before blending, the molecular weight Boltorn H w HBP showed shear thinning while the high molecular weight ones were Newtonian-like.…”

Aromatic Hyperbranched Polymers: Synthesis and Application

“…Jang et al [248] showed that a small amount of hb polyester with hydroxyl end groups could greatly reduce the relative crystallinity of a semicrystalline polyethylene terephthalate (PET) through hydrogen bonds between the -OH groups of the hb polymer and the carbonyl groups of PET. Simon and coworkers [249] discovered that the lower-generation hb polyesters (Boltorn™-type) showed shear-thinning, whereas higher-generation polyesters exhibited Newtonian dependency, which was also found in the blends if at least one blend component showed Newtonian behavior. The study of Nunez et al [250] on the rheological behavior of hb polyesters and their blends with linear polymers observed a drastic decrease in viscosity depending on the hb polymer concentration in the blends.…”