title: Molecular mobility and phase structure of biodegradable poly(butylene succinate) and poly(butylene succinate-co-butylene adipate).
abstract: Molecular mobility and phase structure of biodegradable poly(butylene succinate) (PBS) and poly(butylene succinate-co-20 mol % butylene adipate) [P(BS-co-20 mol % BA)] have been investigated by high-resolution solid-state (13)C NMR. For both samples, two components with different (13)C spin-lattice relaxation time (T(1C)) values have been observed in the crystalline region. The crystalline component with shorter T(1C) value is assignable to the interface near amorphous phase. The crystalline component with longer T(1C) value is ascribed to the inside of the crystalline region. On the basis of T(1C), it has been concluded that the BA units are not included in the crystalline region of P(BS-co-20 mol % BA). Molecular mobility and higher-ordered structure of amorphous phase have been also compared between the melt and solid state. Variable-temperature high-resolution (13)C NMR measurements for the amorphous phase have revealed the remarkable difference in dynamics and structure between the melt and solid state.
authors.affiliation: Polymer Chemistry Laboratory and Characterization Center, RIKEN Institute, Hirosawa 2-1, Wako-shi, Saitama 351-0198, Japan.
authors.forename: Kazuhiro
authors.initials: K
authors.lastname: Kuwabara
authors.forename: Zhihua
authors.initials: Z
authors.lastname: Gan
authors.forename: Takashi
authors.initials: T
authors.lastname: Nakamura
authors.forename: Hideki
authors.initials: H
authors.lastname: Abe
authors.forename: Yoshiharu
authors.initials: Y
authors.lastname: Doi
mesh_terms: D000272:Adipates / Q000737:chemistry*; D001673:Biodegradation, Environmental; D002072:Butylene Glycols / Q000737:chemistry*; D003460:Crystallization; D004058:Diffusion; D004787:Environmental Pollution / Q000517:prevention & control; D009682:Magnetic Resonance Spectroscopy; D015394:Molecular Structure; D011108:Polymers / Q000737:chemistry*; D013386:Succinates / Q000737:chemistry*; D013696:Temperature
chemical_list: D000272:Adipates; D002072:Butylene Glycols; D011108:Polymers; D013386:Succinates; C089797:bionole; C475864:poly(butylene succinate-co-butylene adipate); C009204:butylene glycol adipic acid polyester