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Titelei

作者信息未提供1992-07-01Applied Rheology

On quantitative relations among crystal structures

H. Burzlaff、W. Rothammel1992-07-01Acta Crystallographica Section A Foundations of Crystallography

A procedure for the quantitative evaluation of structural relationships among crystal structures is introduced based on the concept of mappings represented by pairs of matrices (A, S). Lattice relationships, symmetry relationships, local atomic deviations and mapping failures are distinguished and for each type of rel…

X-ray Diffraction in CrystallographyCrystallization and Solubility StudiesChemical Thermodynamics and Molecular Structure

Spectacle lens design: a review

David A. Atchison1992-07-01Applied Optics

This review considers the present state of the design of spectacle lenses with respect to minimizing the side effects that are associated with their wear. Topics include spherical lens design, aspheric lens design, progressive addition lenses, spectacle lens materials, assumptions of conventional lens design, and prac…

Ocular Surface and Contact LensTextile materials and evaluationsLiquid Crystal Research Advancements

Thermally reversible crosslinking of polystyrene via the furan–maleimide Diels–Alder reaction

Stephen A. Canary、Malcolm P. Stevens1992-07-01Journal of Polymer Science Part A Polymer Chemistry

Abstract Mixtures of maleimidomethylated polystyrene with difurfuryl adipate or with furfuryl alcohol‐esterified poly[styrene‐co‐(maleic anhydride)] underwent thermally reversible Diels–Alder crosslinking. Reversal of crosslinking occurred rapidly at 150°C. The instability of the furfuryl group, however, limits the pr…

Polymer composites and self-healingSynthesis and properties of polymersPolymer Nanocomposites and Properties