Study on Synthesis, Rheological and Electrospinning Functional Materials of Carboxymethyl Cellulose Lithium (CMC-Li)

Abstract

The study on electrospinning of natural polysaccharide polymer to be nano-crystallized is still difficult in the current time. Carboxymethyl cellulose sodium (CMC-Na) was successfully synthesized and acidized to obtain carboxymethyl cellulose hydrogen (CMC-H), and new ionic cellulose ether CMC-Li was synthesized by alkalization, and then we analyzed the difference of structure between the three products. By comparing the rheological measurement and analysis of CMC-Na and CMC-Li, which have different mass fractions, it is found that they both show the characteristics of non-Newtonian fluid. The non-Newtonian index of CMC-Li is lower than that of CMC-Na when the degree of substitution (DS) and viscosity of both is similar. For the same material, the ionic cellulose ether solution of lower DS and higher concentration shows the lower non-Newtonian index. For the structure and property characteristic of polymers, it was easy to combine them with water-soluble hydroxyl terminated high molecular weight polyethylene oxide (PEO) to allocate the excellent electrospinning solution. Processing conditions were adjusted to a flow rate of 4 mL/h, an applied voltage of 25 kV, the spinning distance of 12 cm, the better appearance of nanofibers whose average diameter is about 70 nm can be obtained. In the process of electrospinning, hydroxyl lithium ester enolates was obtained by reductive reaction of the ionized Li ＋ with active hydroxyl, which caused the molecular structure to be destroyed. CMC-Li showed the exceptional Non-Newtonian fluid properties and had the better spinning performance than CMC-Na. When the surface tension of liquid was damaged by external electric force of spinning voltage to balance each other, the obtained morphology of the fiber was better. Nano-aluminum powder is coated with CMC-Li to form composite nanofibers, and carbonized at the high temperatures. Al/CNF/Li composite fiber was obtained in which nano particles were uniformly distributed. We preliminarily studied the obtained composite material that remained morphology and structure of fiber, which lays the foundation for the later research that the material is applied to soluble membrane, tissue engineering scaffolds, biological medicine, lithium battery and super capacitor, etc. The satisfactory effects have been achieved through analysis of IR, Rheology and SEM. The paper expands the type of polysaccharide polymer that can be electrospun and filled the void of related research, and it also lays the foundation for the study on nano functional materials of new ionic cellulose ether.

Coaxial Electrospinning as a Process to Engineer Biodegradable Polymeric Scaffolds as Drug Delivery Systems for Anti-Inflammatory and Anti- Thrombotic Pharmaceutical Agents

“…This can be used to create fibers with a core-shell morphology that can have various applications in the fields of drug delivery, tissue engineering and wound healing [8][9][10][11]. Here, the application of two different solutions with different polymers and solvents can be used to create products with tailor-made properties if the process is properly controlled [12][13][14]. Polycaprolactone (PCL) is a hydrophobic, semicrystalline polymer, approved from the Food and Drug Administration (FDA) in the United States of America, whose crystallinity depends on its molecular weight.…”

High Performance Study of Lithium Carboxymethylcellulose as Water‐Soluble Binder for Lithium Supplementation in Lithium Batteries

“…CMC-H was burned in a crucible at 700 °C for 30 min, and no residue was found, indi- cating that the acidified CMC-H had no residue of CMC-Na. [24,25] In addition to the characteristic peaks of the common structure in the carboxymethyl cellulose salt, there is a clear difference between the two carboxymethyl cellulose salts at 723.4 cm −1 , which also proves the successful acquisition of CMC-Li, at 1757, 1602, and 1424 cm −1 , which is because the ─C = O bond and ─CO bond coupled to the same carbon atom after the acidic proton of the carboxylic acid group is replaced by Li ion homogenized.…”

Significance of polymer on emulsion stability in surfactant‐polymer flooding

“…One of the suggested mechanisms is to use oil–water emulsions as a promising drive fluid to improve oil recovery of viscous oils from the reservoirs . The polymer solution has better viscoelasticity, it can expand the sweep volume and surfactant can improve oil displacement efficiencies, as evidenced by its increasing use. From the combination of flooding pilot tests in Daqing oil fields, the recovery had been increased by over 20% after water flooding…”