Shear rheology of diluted solutions of high molecular weight cellulose

Navard, Patrick; Haudin, Jean‐Marc; Quenin, I.; Péguy, A.

doi:10.1002/app.1986.070320715

Cited by 17 publications

(6 citation statements)

References 18 publications

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“…are reported also for polysaccharides [16,259]. In both papers, the correction criterion adopted is the same applied to Newtonian fluids [260,261].…”

Section: Normal Stressesmentioning

confidence: 99%

“…Normal stress data relative to polysaccharide concentrated solutions can be counted on the fingers of one hand [15,16,245,259,263]. In the explored y range, N 1 is a power-law function of y, with a power law index around 1 for xanthan solutions [16], and dextran [245] in distilled water and for cellulose in N,Ndimethylethanolamine N-oxide [259], whereas it ranges from 1.6 to 1.8 for solutions of extracted and commercial xanthan gum in the presence and absence of salt [15]. For aqueous solutions ofguar gum, Whitcomb et al have found that, at the lower concentrations « 0.5%) the first normal stress difference is directly proportional to shear rate [263].…”

Section: Normal Stressesmentioning

confidence: 99%

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Rheology of polysaccharide systems

Lapasin

Pricl

1995

Rheology of Industrial Polysaccharides: Theory and Applications

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The transport properties and, specifically, the rheological behavior of real and complex materials such as polysaccharide systems can be significantly affected by several factors, mainly related to molecular and supermolecular features. Most of these factors are common to all polymeric systems, as they have universal character; others are peculiar to carbohydrate polymers. If we bear in mind the concepts discussed in §1.4, we can easily imagine for polysaccharides a variety of structural conditions much wider than that generally observed for synthetic polymers. On both molecular and supermolecular scales, polysaccharides possess special characteristics that reflect specific behavior so that different classes of materials can be identified.Let us consider the molecular scale first: at this level, the polymer backbone and its related features, such as its length in solution, shape, stitfuess and the eventual presence of ionizable groups, playa major role in determining the macroscopic properties of the system, including its rheology. Many of these molecular parameters correlate among themselves (e.g. chain stitfuess and length); others must be combined with external factors such as, for instance, the characteristics of the solvent medium. These latter may, in turn, exert an influence on the conformation adopted by the macromolecule in the medium itself, as well as on the possibility of forming supermolecular structures. In other words, changes in ionic strength, the nature of counterions, temperature or other solvent parameters may induce a conformational transition, thus modifying the hydrodynamic resistance of the macromolecule to flow. Also, if the polymer concentration is high enough, the variations described above may promote structural changes at a supermolecular level and, accordingly, modifications in the rheological behavior. Before leaving this brief comment on solvent characteristics we must mention the viscosity although, R. Lapasin et al. (eds.), Rheology of Industrial Polysaccharides: Theory and Applications

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“…are reported also for polysaccharides [16,259]. In both papers, the correction criterion adopted is the same applied to Newtonian fluids [260,261].…”

Section: Normal Stressesmentioning

confidence: 99%

Section: Normal Stressesmentioning

confidence: 99%

Rheology of polysaccharide systems

Lapasin

Pricl

1995

Rheology of Industrial Polysaccharides: Theory and Applications

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“…The long‐range intermolecular interaction can be quantitatively described by structural viscosity Δ η as shown below ,

Δ η = - \frac{d \lg η}{d {\overset{γ}{true}}^{0.5}} \times 100.

…”

Section: Resultsmentioning

confidence: 99%

Rheological behavior of ultrahigh molecular weight polyethylene/low‐density polyethylene blending gels with high solid content

Yang

Yang³

et al. 2017

Polymer Engineering & Sci

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For developing polyethylene (PE) fibers with relatively high mechanical properties but low cost, the rheological behaviors of ultrahigh molecular weight polyethylene (UPE) and low density polyethylene (LDPE) blending gels (UL blending gels) were investigated in terms of the shear-induced chain interactions and the sol-gel transitions. UL blending gels with a fixed blend ratio 1/1 of UPE and LDPE but different solid contents (SCs) ranging from 2 wt% (UL-2) to 10 wt% (UL-10) were prepared using paraffin oil as solvent. The UL-10 showed a more significant shear thinning behavior than others, and exhibited a little bit lower apparent viscosity than UPE gel with 5% SC (UPE-5) at elevated temperature even though the SC of UL-10 is double of that of UPE-5. UL blending gel with low apparent viscosity and high SC could ensure smoothly and high-efficient spinning. Rheological measurements confirmed no significant solid-liquid phase separation of the system of UPE and LDPE in paraffin oil. At the same time, the macromolecular orientation under shear and structural viscosity also assured the blending gel UL-10 an excellent spinning performance. UL blending fibers were prepared. The tensile strength of UL-10 fiber reached 1.2 GPa which would satisfy industrial applications demanding relative high mechanical properties. POLYM. ENG. SCI., 58:22-27, 2018.

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“…N 1 values increase with shear rate as the elastic forces increase because of the stretching of the polymer chains under the influence of a flow field. According to Navard et al ., N 1 values normally show a power‐law dependence with shear rate. Thus, for HMSPAM, at low shear rates ranging from 0.1 to 20 sec −1 , the variations of N 1 are fitted with a power‐law index of p = 0.67, while for high shear rates ranging from 20 to 500 sec −1 , N 1 values are fitted with a power‐law index of p = 0.32.…”

Section: Resultsmentioning

confidence: 99%

Novel self‐assembling polymeric system based on a hydrophobic modified copolymer: formulation, rheological characterization, and performance in enhanced heavy oil recovery

Wei

Romero‐Zerón

Rodrigue

2014

Polymers for Advanced Techs

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This work presents the chemical formulation and rheological properties of a novel self-assembling polymer (SAP) system derived from a hydrophobically modified sulfonated polyacrylamide (HMSPAM). This polymeric association was established through complexation between the pendant hydrophobic groups contained in HMSPAM and β-cyclodextrin molecules. The new SAP system offers improved viscoelastic properties because of the "interlocking effect" of the hydrophobic groups into β-cyclodextrin cavities. It also provides suitable reformability upon mechanical shear when compared to the base HMSPAM. Furthermore, SAP exhibits superior tolerance to elevate brine salinity and hardness, as well as high reservoir temperature. Sandpack flooding tests conducted at simulated reservoir conditions (Pelican Lake reservoir, Alberta, Canada) indicate that this system shows superior mobility control (resistance factor) compared to HMSPAM. It also shows potential as in situ permeability modifier, which makes this polymeric system particularly suitable for heavy oil recovery applications. For instance, the newly developed SAP produced 20% more incremental heavy oil recovery if compared to the performance of the commonly used partially hydrolyzed polyacrylamide and 7% more incremental oil recovery than the baseline HMSPAM at the same experimental conditions. Overall, this new self-assembly system shows potential for applications in heavy oil recovery.

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Shear rheology of diluted solutions of high molecular weight cellulose

Cited by 17 publications

References 18 publications

Rheology of polysaccharide systems

Rheology of polysaccharide systems

Rheological behavior of ultrahigh molecular weight polyethylene/low‐density polyethylene blending gels with high solid content

Novel self‐assembling polymeric system based on a hydrophobic modified copolymer: formulation, rheological characterization, and performance in enhanced heavy oil recovery

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