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Measurement of the viscoelastic properties of bituminous materials using an oscillating needle technique (1999)

See, Howard ; Maher, Ann-Marie ; Field, John ; [et al.]

Springer

Rheologica acta 38 (1999), S. 443-450

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ISSN: 1435-1528

Keywords: Key words Micro-Fourier Rheometer ; Oscillating needle ; Random oscillation method ; Complex modulus ; Bitumen

Source: Springer Online Journal Archives 1860-2000

Topics: Chemistry and Pharmacology , Physics

Notes: Abstract An embedded oscillating needle is used to measure the dynamic viscoelastic properties of a stiff bituminous material. A Micro-Fourier Rheometer was used to cause the embedded needle to undergo pseudorandom small amplitude oscillations in the axial direction with measurement of the instantaneous resistance force. The phase and magnitude of the force signal are used to calculate the storage and loss moduli. A theoretical framework for this technique is developed from the Mindlin solution coupled with slender body theory, and the correspondence principle of linear viscoelasticity. Experiments are performed on neat bitumen binders as well as mixtures of glass spheres in bitumen; the results show that the presence of the glass spheres dramatically increases the viscoelastic response functions. The results agree reasonably well with those obtained using the parallel plate squeezing mode.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1007/s003970050195

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(R)1-(+)1-Pantolactone Acrylate as a Chiral Auxiliary in the Baylis-Hillman Reaction (1993)

Khan, Abdullah A. ; Emslie, Neville D. ; Drewes, Siegfried E. ; [et al.]

Weinheim : Wiley-Blackwell

Berichte der deutschen chemischen Gesellschaft 126 (1993), S. 1477-1480

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ISSN: 0009-2940

Keywords: Baylis-Hillman reaction ; 1,3-Dioxan-4-ones, 5-methylene- ; Trichloroacetaldehyde ; Pantolactone ; Chemistry ; Inorganic Chemistry

Source: Wiley InterScience Backfile Collection 1832-2000

Topics: Chemistry and Pharmacology

Notes: 2,6-Dialkyl-5-methylene-1,3-dioxan-4-ones were prepared in good diastereomeric excess by treating pantolactone acrylate with a series of selected aldehydes in the Baylis-Hillman reaction. With benzaldehyde and trichloroacetaldehyde, non-cyclic products resulted. In the case of the latter aldehyde the α1-hydroxyalkyl acrylate 5b was isolated as a single diastereomer and its absolute configuration established by X-ray crystallography.

Additional Material: 1 Ill.