title: Particulation of hyperbranched aromatic biopolyesters self-organized by solvent transformation in ionic liquids.
abstract: Hyperbranched copolymers were prepared by the heat transesterification of 4-hydroxycinnamic acid (4HCA) and 3,4-dihydroxycinnamic acid (DHCA) with a high 4HCA composition dissolved in trifluoroacetic acid (TFA). The nanoparticles were formed after two homogeneous copolymer solutions were mixed in DMF and TFA, which are both good solvents for the copolymer P(4HCA-co-DHCA). We confirmed that the driving force for particulation was solvent interactions that produce ion pairs, which elevate the polarity of the solvent too much to solubilize the copolymers.
authors.affiliation: Department of Applied Chemistry, Graduate School of Engineering, Osaka University, 2-1 Yamadaoka, Suita, Osaka 565-0871, Japan.
authors.forename: Dongjian
authors.initials: D
authors.lastname: Shi
authors.forename: Tatsuo
authors.initials: T
authors.lastname: Kaneko
authors.forename: Mitsuru
authors.initials: M
authors.lastname: Akashi
mesh_terms: D002109:Caffeic Acids / Q000737:chemistry*; D003373:Coumaric Acids / Q000737:chemistry*; D052578:Ionic Liquids / Q000737:chemistry*; D011091:Polyesters / Q000737:chemistry*; D011422:Propionates
chemical_list: D002109:Caffeic Acids; D003373:Coumaric Acids; D052578:Ionic Liquids; D011091:Polyesters; D011422:Propionates; C495469:p-coumaric acid; C040048:caffeic acid