Intrinsic Rheo-Kinetics on Gelation Process of Hydrophobic Amphoteric Cellulose

Ma, Ming; Fang, Bo; Lü, Yongjun; Tian, Meng; Qiu, Xiaohui; Li, Guodong; Hao, Jianwei; He, Yuwei; Caihe, Huang; Liu, Yuting; Wang, Liwei; Li, Kejing

doi:10.1080/01932691.2015.1080613

Cited by 11 publications

(7 citation statements)

References 20 publications

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“…Reference to the figure reveals that the SLB curve of the system under test is fluctuated and decreased constantly within the first 4 h, and then was getting stable. Specifically, the SLB values decreased to lower than 0.5 within the first 2.5 h, indicating gelation of the system, in support of the results shown in Table S2 of the Supporting Information. Moreover, the fact that the SLB values of the system, particularly after the gel is formed, fluctuated over the course of the tests may be an indication of the dynamic nature of the acylhydrazone bond which maintains the gel networks.…”

supporting

confidence: 82%

Calix[4]arene‐Based Dynamic Covalent Gels: Marriage of Robustness, Responsiveness, and Self‐Healing

Yang

Tang

Shang

et al. 2017

Macromol. Rapid Commun.

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Herein, the report on a new class of self-healing and pH/temperature responsive mixed solvent (ethanol and water) gels shows unusual mechanical properties to resist slicing, sustain high compression, and withstand stretching as evidenced by the cutting breaking stress, the fracture compressive stress, and the stretching ratio of one of the gels as obtained can reach or exceed 26.4 MPa, 9.2 MPa, and ≈5 times, respectively. The gels are designed by introducing dynamic covalent bond, acylhydrazone, which is believed to combine the merits of conventional chemical bonds and those of supramolecular interactions. Specifically, a hydrazide-modified calix[4]arene derivative and linear benzaldehyde-terminated poly(ethylene glycol)s are synthesized and used as reactive components to build gel networks. Interestingly, acid-degradable hydrogel can be obtained via natural drying of the mixed solvent gel first and then swelling in pure water.

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supporting

confidence: 82%

Calix[4]arene‐Based Dynamic Covalent Gels: Marriage of Robustness, Responsiveness, and Self‐Healing

Yang

Tang

Shang

et al. 2017

Macromol. Rapid Commun.

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“…The Lab Diffusing Wave Spectroscopy instrument uses a novel microrheology technique to study the gelation mechanism of the crosslinking reaction . Gel solutions with 1, 2, 3, 4, and 5 wt % polyacrylamide were tested by the Rheolaser at 90 °C.…”

Section: Resultsmentioning

confidence: 99%

Gelation mechanism and rheological properties of polyacrylamide crosslinking with polyethyleneimine and its plugging performance in air‐foam displacement

Song

Jiang

Wang

2017

J of Applied Polymer Sci

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Gels based on polyacrylamide crosslinking with polyethyleneimine have attracted attention because of their resulting high strength and good thermal stability. This study investigated the gelation mechanism of the polymeric gel and its plugging performance in air-foam flooding. An optic microrheology analyzer was used to monitor the gelation process. The crosslinking reaction occurred in two steps, as determined from the elasticity factor curves, and the polymeric gels adopted a semisolid state from solution, as determined from the solid liquid balance curves. The elastic modulus values were higher than the viscous modulus values, indicating that mature gels were elastic-based materials. The yield stress increased gradually with increasing polymer dosage, which was consistent with the breakthrough pressure and the trend of displacement pressure. The mature gels showed significant thixotropy. In the core displacement test, the preferred injection volume of the gel was 0.1 pore volume, and the stable pressure of the foam flooding was increased by about three times after the core was plugged. The blocking effect for cores with small original permeability was better than that with large permeability. The best blocking resulted from simultaneous treatment of both ends of the cores, followed by front-end treatment and rear-end treatment.

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“…In order to explore the inuence of temperature on the crosslink gelation process of compound 1/kerosene, elasticity index (EI) and Solid Liquid Balance (SLB) properties of the gel at different temperature was studied through micro-rheological measurements. 46 The result was showed in Fig. 3 and 4.…”

Section: Rheological and Micro-rheological Studiesmentioning

confidence: 87%

Preparation and investigation of temperature-responsive calix[4]arene-based molecular gels

Cai

Rong

et al. 2017

RSC Adv.

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A novel calix [4]arene-based tetracholesteryl derivative was synthesized, and its gelation behaviours in 30 organic solvents were studied. It showed that 1 gelled long chain alkane, some of alcohol, kerosene, ethyl acetate benzene and toluene. Interestingly the gel of 1/kerosene possessed special property, which was that the mixture solution of the compound 1/kerosene heating for a while was put on the flat contact heater and formed a gel film at 25 C and 65 C. Unlike ordinary film, gel film had higher strength and toughness at 65 C, by contrast other was fragile and broken easily at 25 C, this phenomenon was few reported before. In order to explore the phenomenon, the mechanism of the gel of 1/kerosene was discussed by Scanning Electron Microscope (SEM), High Nuclear Magnetic Resonance (H NMR), Fourier Transform Infrared Spectrometer (IR) and micro-rheology. SEM revealed that the xerogel of 1/kerosene assembled network through some long and thick fibers at 65 C, with concentration reducing fibers become thin and its networks were clearly observed. In contrast the morphology of xerogel was porous at low concentration and was a bulk at high temperature system.According to EI data in micro-rheology, the gelation process could be divided into three stages at 65 C and they could be that some cholesterol segments in the gelator interacting with each other formed some small aggregation in the first stage, and other cholesterol section of the gelator sufficiently were cross-linked with time and assembled into large assembly in the second plateau. In the final moment the large assembly build gel network and the system of gel tended to stable. But there are two stages at low temperature and could be some cholesterol segments that didn't take part in assembly, which may be the cause that the performance of gel was fragile.

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Intrinsic Rheo-Kinetics on Gelation Process of Hydrophobic Amphoteric Cellulose

Cited by 11 publications

References 20 publications

Calix[4]arene‐Based Dynamic Covalent Gels: Marriage of Robustness, Responsiveness, and Self‐Healing

Calix[4]arene‐Based Dynamic Covalent Gels: Marriage of Robustness, Responsiveness, and Self‐Healing

Gelation mechanism and rheological properties of polyacrylamide crosslinking with polyethyleneimine and its plugging performance in air‐foam displacement

Preparation and investigation of temperature-responsive calix[4]arene-based molecular gels

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