Viscosity-Temperature Behavior of Hydroxypropyl Cellulose Solution in Presence of an Electrolyte or a Surfactant: A Convenient Method to Determine the Cloud Point of Polymer Solutions

Khuman, Pulingba; Singh, Wazir; Devi, Seram Dushila; Naorem, Homendra

doi:10.1080/10601325.2014.953377

Cited by 23 publications

(20 citation statements)

References 26 publications

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“…However, for temperatures >43 °C cause a substantial decrease in viscosity to 0.6 mPa s. This viscosity is actually comparable to the viscosity of neat water at these elevated temperatures 55. A similar change in bulk viscosity of HPC ( M w = 1 MDa) aqueous solutions with temperature was found earlier by Khuman et al 35 The behavior of bulk viscosity of HPC in the presence of 0.7 M NaCl is shown in Fig. 2f.…”

Section: Resultssupporting

confidence: 83%

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Hydroxypropyl cellulose as a green polymer for thermo-responsive aqueous foams

Weißenborn

Braunschweig

2019

Soft Matter

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Section: Resultssupporting

confidence: 83%

“…In aqueous solutions, the LCST of HPC is at ∼43 °C, and this temperature can be increased or decreased by more than 25 °C e.g. by adding salt 35,36. At the LCST, HPC undergoes a volume-phase transition 36.…”

Section: Introductionmentioning

confidence: 99%

Hydroxypropyl cellulose as a green polymer for thermo-responsive aqueous foams

Weißenborn

Braunschweig

2019

Soft Matter

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“…The association between EHEC and surfactants has been determined with cloud point measurements. When the EHEC solution is heated it starts to separate at a certain temperature into polymer-rich and polymer-poor phases and becomes cloudy (Carlsson et al 1986;Joabsson et al 1998;Khuman et al 2014). It is known that the concentration and type of electrolyte affect the cloud point of EHEC.…”

Section: Introductionmentioning

confidence: 99%

“…NaCl facilitates the phase separation since it makes the solution more polar, and hydrophobic interactions become stronger. (Carlsson et al 1986;Khuman et al 2014;Nyström et al 1996).…”

Section: Introductionmentioning

confidence: 99%

Temperature-dependent interactions between hydrophobically modified ethyl(hydroxyethyl)cellulose and methyl nanocellulose

2019

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The temperature-dependent association between methyl nanocellulose and hydrophobically modified ethyl(hydroxyethyl)cellulose (EHEC) was determined. Methyl nanocellulose was mixed under different concentrations with EHEC in aqueous media. The hydrophobic association, cloud point and temperature-dependent flocculation were studied using turbidity, rheometry and laser diffraction analysis. The phase separation of EHEC samples containing different amounts of methyl nanocellulose in 1.0 wt% solution was measured between 20 and 70°C, showing that the cloud point of the solutions increased with increasing nanocellulose content. An increase in the low shear viscosity and gelation behavior of the mixture with the highest methyl nanocellulose content in conjunction with changes in cloud point indicated that the hydrophobic nanocellulose strengthened the hydrophobic association and the gel network. A bimodal particle size distribution was observed for both the pure EHEC and hydrophobically modified nanocellulose reference solutions, whereas the mixture had a trimodal particle size distribution when being diluted. The colloidal stability and restructuring mechanism of the dilute methyl nanocellulose suspension after shear and the role of birefringence are discussed.

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“…Polymeric surfactants based on hydroxyethyl cellulose (HEC) 39 were prepared by the reaction of a long-chain terminal epoxide with the hydroxyl 40 groups of HEC in an alkaline slurry. 9 Partial hydrophobization of carboxymethyl 41 cellulose with C12-C18 alkyl halides was carried out in the presence of sodium 4 co-monomer styrene (St) in aqueous solution. 12 The C10-C14 alkyl cellulose ester 45 sulfate surfactants were prepared by hydrophilic sulfonation and hydrophobic 46 esterification.…”

Section: Introductionmentioning

confidence: 99%

Preparation and Characterization of Polymeric Surfactants Based on Epoxidized Soybean Oil Grafted Hydroxyethyl Cellulose

Huang

Liu

Shang

et al. 2015

J. Agric. Food Chem.

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Epoxidized soybean oil (ESO) grafted hydroxyethyl cellulose (HEC) was prepared via ring-opening polymerization, in which the hydroxyl groups of HEC acted as initiators and the polymeric ESO were covalently bonded to the HEC. Hydrolysis of ESO-grafted HEC (ESO-HEC) was performed with sodium hydroxide, and the hydrolyzed ESO-HEC (H-ESO-HEC) products were characterized via Fourier transform infrared (FT-IR) and (1)H and (13)C nuclear magnetic resonance (NMR) spectroscopies, high-temperature gel permeation chromatography (HT-GPC), and differential scanning calorimetry (DSC). The results indicated that ring-opening polymerization of ESO occurred with the hydroxyl groups of HEC as initiators. The molecular weights of the H-ESO-HEC products were varied by adjusting the mass ratio of HEC and ESO. Through neutralizing the carboxylic acid of H-ESO-HEC with sodium hydroxide, novel polymeric surfactants (H-ESO-HEC-Na) were obtained, and the effects of polymeric surfactants on the surface tension of water were investigated as a function of concentration of H-ESO-HEC-Na. The H-ESO-HEC-Na was effective at lowering the surface tension of water to 26.33 mN/m, and the critical micelle concentration (CMC) value decreased from 1.053 to 0.157 g/L with increases in molecular weights of the polymeric surfactants. Rheological measurements indicated that the H-ESO-HEC-Na solutions changed from pseudoplastic property to Newtonian with increasing shear rate.

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Viscosity-Temperature Behavior of Hydroxypropyl Cellulose Solution in Presence of an Electrolyte or a Surfactant: A Convenient Method to Determine the Cloud Point of Polymer Solutions

Cited by 23 publications

References 26 publications

Hydroxypropyl cellulose as a green polymer for thermo-responsive aqueous foams

Hydroxypropyl cellulose as a green polymer for thermo-responsive aqueous foams

Temperature-dependent interactions between hydrophobically modified ethyl(hydroxyethyl)cellulose and methyl nanocellulose

Preparation and Characterization of Polymeric Surfactants Based on Epoxidized Soybean Oil Grafted Hydroxyethyl Cellulose

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