Dissolution and Application of Cellulose in NaOH/Urea Aqueous Solution

Xiong, Xiaopeng; Duan, Jiangjiang

doi:10.1002/9781118449400.ch6

Cited by 2 publications

(1 citation statement)

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“…Absorbent cotton was dissolved with alkaline solution and urea under 0 °C. 20 Then, stir vigorously for 2 min, precipitate cellulose with ethanol, wash and precipitate with excessive deionized water, and finally obtain cellulose solution after centrifugation and freeze-drying.…”

Section: Methodsmentioning

confidence: 99%

Preparation and Characterization of a Biobased Temporary Plugging Material: Self-Healing and Degradable

Li,

Wen,

Liu

et al. 2023

ACS Omega

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Due to the low success rate in high-temperature gas well drilling or workover operations, a new type of biobased temporary sealing material was synthesized using vanillin, succinic anhydride (SA), cellulose, and acetylacetone zinc hydrate (AZH) as catalysts. Infrared analysis proved the synthesis of vanillin-derived epoxy and the formation of a vitrimer with hydroxyl ester. The results of thermodynamic properties tests show that it has excellent thermal stability with a high glass transition temperature (T g). The dynamic mechanical test results show that the characteristic relaxation time of the material at 120 °C is 3500 s and the self-healing rate can reach 61% within 20 min. The test results of mechanical properties show that under 10 MPa pressure, it has good elastic deformation performance, the rebound rate is more than 36%, and the crushing rate is less than 17%. The degradation performance results show that the decomposition increases to 80% under 120 °C and 1.2% NaOH. The comprehensive performance evaluation results show that the new temporary plugging material has good compatibility, and its plugging performance is better than those of a gel, composite material, and shape memory polymer. The maximum fracture plugging capacity is 5 × 4 mm, with a pressure up to 10 MPa.

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Section: Methodsmentioning

confidence: 99%