2-Acylidene-3,5-diaryl-2,3-dihydro-1,3,4-thiadiazoles and related compounds: a question of hypervalent S … O interactions

Pandya, Naresh; Basile, Anthony J.; Gupta, Ajay Kumar; Hand, Patrick; MacLaurin, C. L.; Ratemi, Elaref; Gibson, M. S.; Richardson, Mary Frances

doi:10.1139/v95-171

Cited by 2 publications

(2 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Based on the effect of shear action on the hydrophobic microregion, we think the shear mainly destroys the polymer molecular intermolecular packing. The hydrophobic region enables fractured intermolecular packing reassembly, so they can still form the space network structure [24][25][26]. Thus, the viscosity concentration curve of polymer reveals shear thickening ability, shows stronger spatial structure and is less affected by the shear effect.…”

Section: Effect Of Mechanical Shearing On Microstructurementioning

confidence: 99%

“…Using a fluorescence photometer (Cary Eclipse) with the help of fluorescence probe molecule [24][25][26], the sensitivity of microphysical environment to photophysical and photochemical properties is studied. The concrete steps are as follows: (i) prepare pyrene probe and prepare a solution of 1.715 × 10 −6 mol l −1 pyrene; (ii) select the polymer solution required for the preparation of the target; (iii) place 0.5 ml containing pyrene into the ampoule containing the target polymer solution and set it up for 24 h; (iv) administer the fluorescence photometer test of the radical association peak.…”

Section: Fluorescence Analysis Of Polymer Aggregation Behaviourmentioning

confidence: 99%

See 1 more Smart Citation

The seepage flow characteristics of hydrophobically associated polymers with different aggregation behaviours in porous media

Shi

Zhu

et al. 2020

R. Soc. open sci.

View full text Add to dashboard Cite

The polymer solution for oil displacement is subjected to strong shear action in practical application, and this action will affect its percolation characteristics in porous media. The effects of mechanical shearing on the solution properties and seepage characteristics of modified hydrophobically associated polymers and dendrimers with two different aggregation behaviours were studied. The results showed that mechanical shearing did not affect hydrophobic microzones. Polymers can re-associate to restore part of the network structure, thereby improving shear resistance (dendritic hydrophobically associating polymers > hydrophobically modified partially hydrolysed polyacrylamide). Polymers with ‘cluster’ aggregation behaviour enhanced solution performance, enabling them to establish higher resistance coefficient (RF) and residual resistance factor (RRF) in porous media but also bringing about injection difficulties. Increasing the injection rate would increase the injection pressure, but the established RF and RRF showed a downward trend. Mechanical shear pretreatment effectively improved the injectability of the polymer. To achieve polymer injection and flow control, pre-shearing polymer solution and low-speed injection can be used in field applications.

show abstract

Section: Effect Of Mechanical Shearing On Microstructurementioning

confidence: 99%

Section: Fluorescence Analysis Of Polymer Aggregation Behaviourmentioning

confidence: 99%