. . "GB - Spojen\u00E9 kr\u00E1lovstv\u00ED Velk\u00E9 Brit\u00E1nie a Severn\u00EDho Irska" . "RIV/61389013:_____/07:00081233" . "Murakami, R." . "9"^^ . "Studium vzniku a stability .beta.-struktury v biodegradovateln\u00E9m ultra-vysokomolekul\u00E1rn\u00EDm polyhydroxybutyr\u00E1tu pomoc\u00ED infra\u010Derven\u00E9 a Ramanovy spektroskopie a kvantov\u011B chemick\u00FDch v\u00FDpo\u010Dt\u016F"@cs . "Studium vzniku a stability .beta.-struktury v biodegradovateln\u00E9m ultra-vysokomolekul\u00E1rn\u00EDm polyhydroxybutyr\u00E1tu pomoc\u00ED infra\u010Derven\u00E9 a Ramanovy spektroskopie a kvantov\u011B chemick\u00FDch v\u00FDpo\u010Dt\u016F"@cs . "Formation and stability of .beta.-structure in biodegradable ultra-high-molecular-weight poly(3-hydroxybutyrate) by infrared, Raman, and quantum chemical calculation studies"@en . "RIV/61389013:_____/07:00081233!RIV07-AV0-61389013" . "P(GA203/05/0425), Z(AV0Z40500505)" . "Polymer" . . "ultra-high-molecular-weight poly(hydroxybutyrate); .beta.-form; Raman spectroscopy"@en . . . "Infrared (IR) and Raman spectra were measured for four kinds of ultra-high-molecular-weight poly[(R)-3-hydroxybutyrate] (UHMW-PHB) films: a solvent-cast film, a cold-drawn film, a two-step-drawn film, and a hot-drawn film. Quantum chemical calculations were made for octamer models of UHMW-PHB with a helix conformation (.alpha.-form) and a planar zigzag conformation (.beta.-form). The infrared and Raman spectra of two-step-drawn film also indicate that it has more amorphous parts than other films. When the two-step-drawn film was further heated up to 130 \u00B0C and then cooled down to room temperature, the above additional bands due to the .beta.-form disappeared in the Raman spectra, suggesting that the .beta.-form is less stable than .alpha.-form." . . . "[A4DD761924BD]" . "Formation and stability of .beta.-structure in biodegradable ultra-high-molecular-weight poly(3-hydroxybutyrate) by infrared, Raman, and quantum chemical calculation studies" . "Formation and stability of .beta.-structure in biodegradable ultra-high-molecular-weight poly(3-hydroxybutyrate) by infrared, Raman, and quantum chemical calculation studies" . "2672;2680" . . . "Byla zm\u011B\u0159ena infra\u010Derven\u00E1 a Ramanova spektra \u010Dty\u0159 typ\u016F f\u00F3li\u00ED ultra-vysokomolekul\u00E1rn\u00EDho polyhydroxybutyr\u00E1tu (UHMW-PHB): f\u00F3lie odlit\u00E1 z roztoku, f\u00F3lie ta\u017Een\u00E1 za studena, f\u00F3lie ta\u017Een\u00E1 ve dvou kroc\u00EDch, f\u00F3lie ta\u017Een\u00E1 za horka. Byly provedeny kvantov\u011B chemick\u00E9 v\u00FDpo\u010Dty oktamerov\u00FDch model\u016F UHMW-PHB s .alpha.-helixovou konformac\u00ED (.alpha.-forma) a s rovinnou zigzag konformac\u00ED (.beta.-forma). Detailn\u00ED porovn\u00E1n\u00ED pozorovan\u00FDch a vypo\u010D\u00EDtan\u00FDch hodnot frekvenc\u00ED a intenzit Ramanov\u00FDch p\u00E1s\u016F .beta.-formy ukazuje, \u017Ee obsah .beta.-formy je relativn\u011B mal\u00FD a \u017Ee .beta.-struktura vykazuje men\u0161\u00ED uspo\u0159\u00E1d\u00E1n\u00ED."@cs . "Formation and stability of .beta.-structure in biodegradable ultra-high-molecular-weight poly(3-hydroxybutyrate) by infrared, Raman, and quantum chemical calculation studies"@en . "Iwata, T." . . "422379" . "Infrared (IR) and Raman spectra were measured for four kinds of ultra-high-molecular-weight poly[(R)-3-hydroxybutyrate] (UHMW-PHB) films: a solvent-cast film, a cold-drawn film, a two-step-drawn film, and a hot-drawn film. Quantum chemical calculations were made for octamer models of UHMW-PHB with a helix conformation (.alpha.-form) and a planar zigzag conformation (.beta.-form). The infrared and Raman spectra of two-step-drawn film also indicate that it has more amorphous parts than other films. When the two-step-drawn film was further heated up to 130 \u00B0C and then cooled down to room temperature, the above additional bands due to the .beta.-form disappeared in the Raman spectra, suggesting that the .beta.-form is less stable than .alpha.-form."@en . . "48" . "1"^^ . "Ozaki, Y." . . . "9" . . "Sato, H." . "Dybal, Ji\u0159\u00ED" . . "0032-3861" . . . "5"^^ .