Rheological Characterization of Clay-PolyesterComposites

Abu-Jdayil, Basim; Al-Omari, Salah Addin Burhan; Taher, Hanifa; Al-Nuaimi, Latifa

doi:10.1016/j.proeng.2011.04.119

Cited by 5 publications

(3 citation statements)

References 12 publications

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“…Whether clay slurries behave in a thixotropic manner is still not conclusive. Although most work found clay suspensions as thixotropic, [ 15–20,28,29 ] it is also reported that the apparent viscosity of clay suspension is an increasing function of the applied shear duration, [ 13,22,30,31 ] as also shown in this work. It appears that such controversy might come from the differences in the properties of tested clays (e.g., size and content), applied shear strength, test procedures and conditions (e.g., test time in seconds, minutes or longer), and the related particle–liquid and particle–particle interactions (e.g., the presence of coagulants or flocculants).…”

Section: Discussionsupporting

confidence: 73%

Time‐dependent viscosity of structured clay suspensions

Zhou¹

2022

Can J Chem Eng

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Time-dependent viscosity of structured clay suspensions under a fixed shear was revealed in the prepared slurry samples of clay lenses from the Athabasca oil sands deposit, differing from thixotropic or rheopectic suspensions. At a lower salt (Na or Ca) concentration, the viscosity oscillated with time, which was slowly damped with increasing salt concentrations. The viscosity increased without reaching a maximum plateau, even after a run of a few hours. At 1000 ppm Na concentration, a maximum viscosity was reached, followed by viscosity fluctuation within a narrow range to approach an equilibrium value with time. Both sample ageing and shear history affected the slurry viscosity. It was speculated that the Brownian motion of colloidal clay particles and the applied shear induced rearrangement and continued formation of clay microstructures with time, due to the rotation of anisotropic colloidal clay particles under simple shear flow. Its implications to oil sands research and operation were briefly discussed.

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Section: Discussionsupporting

confidence: 73%

Time‐dependent viscosity of structured clay suspensions

Zhou¹

2022

Can J Chem Eng

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“…However, this Newtonian region disappears when the amount of UP is increased in the blend. Those samples present a shear thinning behaviour, characterized by decreasing viscosity with increasing shear rates [40], all through the experiment. The disappearance of the Newtonian region is due to the fact that UP is obtained by bulk polycondensation while macLA-IEMA is synthesised in diethyl ether.…”

Section: Rheological Studiesmentioning

confidence: 90%

Preparation of biodegradable functionalized polyesters aimed to be used as surgical adhesives

Cernadas

Gonçalves

Alves

et al. 2019

European Polymer Journal

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The study and development of new biocompatible materials to be applied as UV-curable adhesives is extremely important to grant the preparation of matrices with suitable mechanical, biological and thermal properties with a fast curing rate. Herein, photocrosslinkable biodegradable copolymers composed of unsaturated polyesters (UP) and lactic acid oligomers functionalized with 2-isocyanatoethyl methacrylate (IEMA) were produced. Henceforth, three different stoichiometric proportions were tested, which, after the addition of a biocompatible photoinitiator (Irgacure® 2959), resulted in flexible, resistant and uniform matrices after 2 minutes and 30 seconds of crosslinking.The synthesized materials were then further characterized in terms of chemical composition and thermal/mechanical behaviour. The gel content, dynamic contact angles, water sorption capacity and hydrolytic degradation were also assessed. The biocompatibility and antibacterial activity of the produced materials was also evaluated.Taking into account all the data obtained, it may be concluded that the new synthesized biodegradable bioadhesives present promising properties to be used as surgical adhesives.

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“…On the other hand, bentonite is made up of highly colloidal clay minerals [19]. This clay has been studied due to its rheological properties to be used as a mineral filler in polymeric compounds, such as bentonite-polyester [20]. Mixtures of kaolin and bentonite composed the soils used in the work.…”

Section: Methodsmentioning

confidence: 99%

Rheological behaviour of clays in plastic state

2021

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Clayey soils exhibit viscoelastic behaviour in the plastic state, implying simultaneous retentive and dissipative mechanical properties as well as strain rate dependent properties. Such response is partially captured by the socalled Atterberg plastic limits. A more comprehensive evaluation of the mechanical response of this type of soils in the plastic state can be obtained by testing in a dynamic shear rheometer. Clayey soils consisting of different proportions of kaolin and bentonite and different water contents were subjected to dynamic shear tests to measure their rheological properties. All tests were performed with a constant strain amplitude of 10%, a fixed range frequency sweep (0.1 Hz to 100 Hz) and a constant temperature of 20°C. The results show that the complex shear modulus has an inverse relationship with the soil water content and a direct relationship with the plasticity index. Moreover, the phase angle increases slightly and then decreases suddenly as the frequency increases. The complex shear moduli obtained by dynamic tests were compared with the oedometric moduli estimated by correlations and showed satisfactory trends between them. The study contributed to the understanding of the complex behaviour of soils in the plastic state. Although the mechanical response of these materials is affected by some factors, the plasticity limits were consistent with the complex moduli under analogous conditions of strain and frequency.

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Rheological Characterization of Clay-PolyesterComposites

Cited by 5 publications

References 12 publications

Time‐dependent viscosity of structured clay suspensions

Time‐dependent viscosity of structured clay suspensions

Preparation of biodegradable functionalized polyesters aimed to be used as surgical adhesives

Rheological behaviour of clays in plastic state

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