Journal of Polymer Science Part A-2 Polymer Physics · 1966 · 68 citations · 10 references
Natural SciencesBiochemistryChemistryCrystal StructurePhysical ChemistrySolid-state ChemistryCrystal ChemistryCrystallization ProcessesCrystallographyElectron DiffractionMacromolecular StructureX-ray CrystallographyElectron Diffraction Pattern AnalysisHelical SymmetryHexagonal SymmetryHexagonal Unit CellsLamellar MorphologyLamellar StructureUnit Cell DeterminationUnit Cell Geometry
Abstract It has been shown that lamellar crystals of amylose V complexes with 7 1 helical configuration can be obtained by using complexing agents larger in cross section than n ‐butanol. The electron diffraction studies indicated a new unit cell for the unheated lamellar crystals which are composed of molecules with 7 1 helical configuration and hold water molecules on the exterior of the helix. Furthermore, from a throughly dried specimen at 100°C. in vacuo we obtained a pattern which showed only three Debye rings. Its spacings were explained by a two‐dimensional hexagonal unit cell having a = b = 14.7 A. proposed by Zaslow. It was also found that when the crystals were dispersed in methanol at room temperature, their electron diffraction pattern was the same as that of the anhydrous amylose V complex of n ‐butanol.
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