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Digitale Medien

Crystal structure of α-gutta percha: Modification of the constrained least-squares method (1973)

Takahashi, Yasuhiro ; Sato, Takefumi ; Tadokoro, Hiroyuki ; [weitere]

New York : Wiley-Blackwell

Journal of Polymer Science: Polymer Physics Edition 11 (1973), S. 233-248

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Details

ISSN: 0098-1273

Schlagwort(e): Physics ; Polymer and Materials Science

Quelle: Wiley InterScience Backfile Collection 1832-2000

Thema: Chemie und Pharmazie , Physik

Notizen: The crystal structure of α-gutta percha has been determined by x-ray diffraction. The unit cell parameters are a = 7.98 Å, b = 6.29 Å, c (fiber period) = 8.77 Å, and β = 102.0° (monoclinic). The space group is P21/c-C2h5. Two molecular chains of nearly trans-CTS-trans-CTS̄ conformation pass through a unit cell; C, T, S, and S̄ being the cis, trans, and two types of skew forms, respectively. The constrainedle astsquares method was modified so that the order of the least squares matrix could be reduced and was applied to the refinement of the crystal structure.

Zusätzliches Material: 9 Ill.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1002/pol.1973.180110205

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