title: Solvent-responsive behavior of inclusion complexes between amylose and polytetrahydrofuran.
abstract: Highly crystalline amylose-polytetrahydrofuran (PTHF) complexes can be obtained by employing organic solvents as washing agents after complex formation. The X-ray diffraction (XRD) of the washed complexes appear sharp at 12.9°-13.2° and 19.6°-20.1°, clear signs of the presence of V6I -amylose. Other diffraction peaks correlate with V6II -amylose, which indicates that the complexed amylose helices are in the form of an intermediate or a mixture of V6I - and V6II -amylose. SEM imaging reveals that the amylose-PTHF complexes crystallize in the form of lamellae, which aggregate in a round shape on top of one another with a diameter around 4-8 μm. Some lamellas aggregate as flower-like or flat-surface spherulitic crystals. There is a visible matrix in between the aggregated lamellas which shows that a part of the amylose-PTHF complexes is amorphous.
authors.affiliation: Department of Polymer Chemistry, Zernike Institute for Advanced Materials, University of Groningen, Nijenborgh 4, 9747AG, Groningen, The Netherlands.
authors.forename: Rachmawati
authors.initials: R
authors.lastname: Rachmawati
authors.forename: Albert J J
authors.initials: AJ
authors.lastname: Woortman
authors.forename: Katja
authors.initials: K
authors.lastname: Loos
mesh_terms: D000688:Amylose / Q000737:chemistry* / Q000648:ultrastructure; D002072:Butylene Glycols / Q000737:chemistry*; D002152:Calorimetry, Differential Scanning; D003460:Crystallization; D000431:Ethanol / Q000737:chemistry; D008855:Microscopy, Electron, Scanning; D008970:Molecular Weight; D011108:Polymers / Q000737:chemistry*; D012997:Solvents / Q000737:chemistry; D014867:Water / Q000737:chemistry; D014961:X-Ray Diffraction
chemical_list: D002072:Butylene Glycols; D011108:Polymers; D012997:Solvents; C524501:poly(tetrahydrofuran); D014867:Water; D000431:Ethanol; D000688:Amylose
keywords: amylose; inclusion chemistry; mixing; polytetrahydrofuran; solvent responsive