title: Heterostereocomplexation between biodegradable and optically active polyesters as a versatile preparation method for biodegradable materials.
abstract: The thermal properties and crystallization of biodegradable and optically active poly[(S)-2-hydroxybutyrate] [P(S-2HB)], poly(l-lactide) (PLLA), poly(d-lactide) (PDLA) and their blends were investigated. The results of differential scanning calorimetry, wide-angle X-ray scattering (WAXS), and polarized optical microscopy first indicated heterostereocomplexation between biodegradable and optically active polyesters having different chemical structures and opposite configurations, that is, P(S-2HB) and PDLA. The melting temperature of the heterostereocomplex was higher than those of pure polymers. Such cocrystallization was not observed for P(S-2HB)/PLLA blends having identical configurations. The WAXS profile of P(S-2HB)/PDLA heterostereocomplex was very similar to those of the PLLA/PDLA and P(S-2HB)/P(R-2HB) homostereocomplexes and each crystalline diffraction peak of the heterostereocomplex was located between those of the homostereocomplexes. The present study strongly suggests that heterostereocomplexation will provide a novel versatile method for preparing biodegradable polyester materials with a wide range of physical properties and biodegradability.
authors.affiliation: Department of Ecological Engineering, Toyohashi University of Technology, Tempaku-cho, Toyohashi, Aichi 441-8580, Japan. tsuji@eco.tut.ac.jp
authors.forename: Hideto
authors.initials: H
authors.lastname: Tsuji
authors.forename: Satomi
authors.initials: S
authors.lastname: Yamamoto
authors.forename: Ayaka
authors.initials: A
authors.lastname: Okumura
authors.forename: Yu
authors.initials: Y
authors.lastname: Sugiura
mesh_terms: D001672:Biocompatible Materials / Q000737:chemistry*; D001673:Biodegradation, Environmental; D002152:Calorimetry, Differential Scanning; D003460:Crystallization; D008859:Microscopy, Polarization; D011091:Polyesters / Q000138:chemical synthesis / Q000737:chemistry*; D011108:Polymers / Q000138:chemical synthesis / Q000737:chemistry*; D013237:Stereoisomerism; D014961:X-Ray Diffraction
chemical_list: D001672:Biocompatible Materials; D011091:Polyesters; D011108:Polymers; C033616:poly(lactide)