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

Abstract

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.

Synthesis and Performance of a Novel High-Efficiency Coal Dust Suppressant Based on Self-Healing Gel

“…According to the test results of functional groups and the interpretation of related papers, the reaction process of the whole system is shown in Figure b. − In the reaction system, HEC is the substrate of reaction, providing cross-linking sites for subsequent SMA and AM polymerization, and is the basic mechanical guarantee of the gel system. Sodium dodecyl sulfate (SDS) is an emulsifier, which can effectively improve the solubility of SMA in water and ensure the grafting rate of SMA and HEC.…”

Skin and bubble formation in films made of methyl nanocellulose, hydrophobically modified ethyl(hydroxyethyl)cellulose and microfibrillated cellulose

“…Such an interaction could partly explain the differences between EHEC-MFC at ratios of 50:50 and 25:75 dried at 23 and 50°C. The interaction between EHEC and methyl nanocellulose at a ratio of 25:75 (Lyytikäinen et al 2019) could also explain the lower OTR value compared with that of the pure methyl nanocellulose film.…”

“…The fibrillar structure of MFC was observed in the methyl nanocellulose-MFC film, but the granular structures visible in the EHEC-MFC film were not observed with methyl nanocellulose. This may be due to an increase in particle size of EHEC at higher temperatures in aqueous solutions (Lyytikäinen et al 2019) or a better compatibility between the methyl nanocellulose and EHEC than between the MFC and EHEC. When the EHEC-MFC films were dried at 23°C, MFC fibrils were clearly visible as in the EHEC-MFC films dried at 50°C.…”

Fundamental Mechanisms and Factors Associated with Nanoparticle-Assisted Enhanced Oil Recovery

“…They found an increase in the viscosity when the temperature increased from 25 to 50 °C. At low temperature, hydrogen bonding formed around the hydrophobic part of the NC-KYSS, which made the hydrophobic polymers soluble in water. − However, with an increase in the temperature, the hydrogen bonding broke, which facilitated the hydrophobic interaction among the polymers. , The increase in viscosity with the increase in temperature is probably due to the network formed from the hydrophobic interaction between the polymers. The viscosity then decreased when the temperature further rose above 50 °C (Figure ).…”

“…145−147 However, with an increase in the temperature, the hydrogen bonding broke, which facilitated the hydrophobic interaction among the polymers. 148,149 The increase in viscosity with the increase in temperature is probably due to the network formed from the hydrophobic interaction between the polymers. The viscosity then decreased when the temperature further rose above 50 °C (Figure 11).…”