(1990) Structural studies in the oligomethylene dithiobenzoate series, nDBS, where n, the number of methylene groups is odd. (1974) Evaluation of n-beam wave functions in electron scatering. Département de chimie, Université de Montréal. (1990) Étude de la structure de dibenzamido-alcanes substitués par spectroscopie infrarouge et par résonance magnétique nucléaire. Nato Advanced Workshop, Erice, Italy.įorest, H. (1990) Prerequisite for successful ab initio electron diffraction structure analysis of organic crystals. (1980) Electron diffraction intensities from bent molecular organic crystals. (1979) Evaluation of the mozaic model for polymer single crystals. (1976) Diffraction Physics, North Holland Publishing Co., Amsterdam, ch. (1962) The scattering of electrons by thin crystals. (1974) Structure analysis of polymer crystals by electron diffraction. (1979b) Single crystal and oriented crystallization of ivory nut mannan. (1979a) Structural polymorphism of (1 → 4)β-D-xylan. (1989b) Model compounds of aromatic Nylons (2): N,N’-trimethylenebis( p-methoxybenzamide), N,N’-pentamethylenebis( p-methylbenzamide) and N,N’-heptamethylenebis( p-methylbenzamide) by X-ray diffraction, IR spectroscopy and 13C CP/MAS NMR spectroscopy. (1989a) Model compounds of aromatic Nylons (3): The conformation of 4T Nylon, using X-ray diffraction, solid-state 13C NMR spectroscopy and IR spectroscopy. (1985) Étude comparative dans la série des dibenzamido alcanes, composés modèles des poly(oligométhylènes téréphtalamides). (1984b) Poly(1,4- trans-cyclo-hexanediyldimethylene succinate): A structural determination using X-ray and electron diffraction. The crystal structure of form I and form II from electron and X-ray diffraction, and packing analyses. (1984a) Poly(hexamethylene terephthalate)-II. To be published.īrisse, F., Palmer, A., Moss, B., Dorset, D., Roughead, W.A., and Miller, D.P. (1990) Electron diffraction analysis of the monoclinic form of poly(hexamethylene terephthalate). This process is experimental and the keywords may be updated as the learning algorithm improves.īrisse, F., and Chanzy, H. These keywords were added by machine and not by the authors. Selection among the various structures of the one for which there is the best possible agreement between observed and calculated electron diffraction structure amplitudes.Įach step of this process will be examined and discussed with some specific examples. Packing each of the potential structures within the polymer’s unit cell, taking the space group symmetry elements into consideration. The crystal structure of these small molecules is then established by standard X-ray diffraction analyses.īuilding of potentially acceptable polymer structures using geometrical and conformational information derived from the model compound crystal structures.ĭetermination of the space group and the unit cell dimensions of the polymer. Syntheses of two to four model compounds of the polymer of interest. In order to “solve” the crystal structure of a polymer from electron diffraction intensities one proceeds through a five step process: These micro single crystals with lateral dimensions of the order of 2 to 10 µm and 50–200 Å thick are suitable for an examination by electron microscopy and transmission electron diffraction. Single crystals of natural and synthetic polymers may be grown from dilute solutions.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |