title: Nano-ordered surface morphologies by stereocomplexation of the enantiomeric polylactide chains: specific interactions of surface-immobilized poly(D-lactide) and poly(ethylene glycol)-poly(L-lactide) block copolymers.
abstract: Both AB diblock and ABA triblock copolymers consisting of poly(L-lactide) (PLLA: A) and poly(ethylene glycol) (PEG: B) were deposited on a silicon surface on which poly(D-lactide) (PDLA) had been preimmobilized. The deposit of the diblock copolymer (PLLA-PEG) formed band structures similar to those observed when the same copolymer was directly deposited on the silicon surface. In contrast, the deposit of the triblock copolymer (PLLA-PEG-PLLA) formed many particulates scattering over the surface. When the PLLA-PEG deposit was subjected to water-soaking, the original band morphology was completely replaced by the particulate morphology that was identical to that of the PLLA-PEG-PLLA deposit. Their FT-IR analyses revealed that both copolymers had been bound through the stereocomplex (sc) formation between the preimmobilized PDLA chains and the PLLA blocks of the copolymers. Grazing-incidence small-angle X-ray scattering (GISAXS) also supported these surface morphologies. It was therefore evident that hydrophilic PEG chains can be immobilized on the PDLA-preimmobilized surface by the sc formation.
authors.affiliation: Department of Biobased Materials Science, Kyoto Institute of Technology , Matsugasaki, Sakyo-ku, Kyoto 606-8585, Japan.
authors.forename: Maho
authors.initials: M
authors.lastname: Nakajima
authors.forename: Hajime
authors.initials: H
authors.lastname: Nakajima
authors.forename: Tomoko
authors.initials: T
authors.lastname: Fujiwara
authors.forename: Yoshiharu
authors.initials: Y
authors.lastname: Kimura
authors.forename: Sono
authors.initials: S
authors.lastname: Sasaki
mesh_terms: D007773:Lactates / Q000737:chemistry*; D019344:Lactic Acid / Q000737:chemistry*; D008956:Models, Chemical; D011091:Polyesters / Q000737:chemistry*; D011092:Polyethylene Glycols / Q000737:chemistry*; D011108:Polymers / Q000737:chemistry*; D013499:Surface Properties
chemical_list: D007773:Lactates; D011091:Polyesters; D011108:Polymers; C088513:poly(lactic acid-ethylene glycol); D019344:Lactic Acid; D011092:Polyethylene Glycols; C033616:poly(lactide)