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91.
Immiscible polymer blends are known to display an unusual elastic recovery after stress release. Recoil after steady-state
shearing is well understood and obeys specific scaling relations. Releasing the stress before the steady-state morphology
has been reached results in a more complex elastic recovery, including very large final values. This behaviour is investigated
systematically. Model blends are used, consisting of nearly inelastic components; hence the measured recoil can be attributed
totally to contributions from the interface. The instantaneous structure at the onset of the recoil can vary greatly in transient
experiments, ranging from slightly deformed droplets to highly elongated filaments. The effects of this initial structure
on the ultimate recoil and time scale of the recovery are studied. The morphological changes during recovery are considered
as well. It is demonstrated that they can be computed from the normal stresses during stress relaxation with comparable initial
morphologies. This indicates that the same morphological changes occur during stress relaxation and constrained recoil. A
scaling relation for the recoil curves has been derived from the Doi-Ohta theory, which is confirmed by the experiments.
Received: 9 December 1998 Accepted: 5 April 1999 相似文献
92.
Tigran Dadalyan Zhirayr Ninoyan Inge Nys Roman Alaverdyan Jeroen Beeckman Kristiaan Neyts 《Liquid crystals》2018,45(9):1272-1278
The influence of the pump laser beam on the lasing spectral characteristics in dye-doped cholesteric liquid crystal is investigated. Under the influence of the pump laser pulses with different repetition rates and energies, non-linear reorientation and light-induced flow reorientation of chiral nematic liquid crystals (CLC) molecules was observed. Independent of the reorientation mechanism, multi-wavelength lasing was achieved due to stepwise uncoiling of the CLC structure. Under the influence of a pump laser beam with low repetition rate, Cano–Grandjean disclination defect lines were induced which remain even after removal of the laser beam. 相似文献
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Hennrich G Murillo MT Prados P Song K Asselberghs I Clays K Persoons A Benet-Buchholz J de Mendoza J 《Chemical communications (Cambridge, England)》2005,(21):2747-2749
Rigid, highly conjugated tetraalkynyl-calix[4]arenes synthesised via Sonogashira coupling give rise to improved second-order hyperpolarizability values as determined by hyper-Rayleigh scattering--a technique that in addition to X-ray crystallography also allows for the conformational analysis of the calixarene structures in solution. 相似文献
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