99% N,N-Dimethylacetamide CAS 127-19-5

What is N,N-dimethylacetamide? What are the uses of all grades?

1. What is N,N-Dimethylacetamide?

N,N-Dimethylacetamide (also known as dimethylacetamide, dimethylacetamide, or DMAc, DMAC, DMA) is an amide compound formed by replacing the two hydrogen atoms on the nitrogen atom of acetamide with methyl groups. It is one of the most important polar aprotic solvents in industry, and its chemical formula is usually written as:

C4H9NO (CH3CON(CH3)2, CAS No.: 127-19-5, EINECS No.: 204-826-4, molecular weight approx. 87.12)

It is a colorless and transparent liquid at room temperature with a weak ammonia odor. It is completely miscible with water, alcohols, ethers, ketones, and most organic solvents. It has a high boiling point, a low evaporation rate, and excellent solubility, especially for polymers such as polyurethane resins and polyimide resins. DMAc's chemical properties are very similar to those of N,N-dimethylformamide (DMF), making it a representative amide solvent. It does not decompose when heated to boiling at normal pressure in the absence of acid or alkali, and can be recovered by atmospheric distillation.

From the perspective of dissolution mechanism, the amide carbonyl group (C=O) and nitrogen atom in the DMAc molecule give it both strong polarity and excellent coordination ability, enabling it to dissolve a variety of polar polymers and resins, thus earning it the title of an important member of the "universal solvent" family. With its high boiling point, low volatility, good thermal stability, strong dissolving power, and no residual evaporation, DMAc has become a core solvent in fields such as fiber spinning, polymer films, and semiconductor electronic chemicals.

DMAc is stable and not easily hydrolyzed, but is soluble in water. It is flammable and its vapor can form explosive mixtures with air and therefore it must be kept away from sources of ignition and strictly controlled. Store in a sealed, moisture-proof container, away from sources of ignition and oxidizers.

This product is segmented into application areas as follows: Industrial grade (for fiber spinning and polymer films), High purity/electronic grade (for semiconductors and electronic chemicals, with extremely strict control of metal ions and evaporation residues), and Reagent grade (for laboratory). Different grades have different requirements for purity, impurities and metal ion control, and focus on the following indicators:

1. Content (purity)

It is contingent upon the content. The content determines the effect of the reaction and the solubility. High purity and electronic grade are even higher and industrial grade is usually over 99%. It is the main indicator of product specifications.

2.Moisture

Moisture affects the stability of spinning solutions, polymerization systems, electrolytes and electronic chemicals, which should be strictly controlled in polymer processing and electronic applications.

3. Acidity (as acetic acid)

Acidity is the amount of free acid. Polymerization reactions, properties of resins and quality of electronic chemicals are affected by excessive acidity and should be controlled in a reasonable range.

4. Alkalinity (as dimethylamine)

The amount of free amines is reflected in alkalinity, which affects the stability of the reaction system and downstream products, so it must be strictly controlled.

5. Chromaticity (APHA)

The color influences the appearance of the downstream products, especially films and fibers, so it must be colorless and transparent.

6.Evaporation residue and metal ion content

Electronic-grade products must keep evaporation residues and metal ions such as sodium, potassium, and iron at extremely low levels (ppb level) to avoid contaminating semiconductor devices.

II. What are the uses of N,N-Dimethylacetamide?

With its unique combination of properties—high boiling point, low volatility, strong solubility, thermal stability, and no residual evaporation—DMAc has extremely wide applications across fields such as fibers, thin films, electronics, and laboratory equipment.

1.Synthetic fiber spinning solvent (core industrial application)

DMAc is a classic solvent for solution spinning of synthetic fibers. It is used in the spinning of high-performance fibers such as meta-aramid, para-aramid, polyacrylonitrile (acrylic fiber), and spandex to help dissolve polymers, ensure the stability of the spinning solution and the uniformity of fiber properties. It is a key solvent in the global aramid industry.

2.Polyimide film and resin solvent (industrial grade)

DMAc has excellent solubility for resins such as polyimide and polyurethane, and is a core solvent for the preparation of polyimide films (PI films), engineering plastics and polymer films, serving high-end applications such as electronic insulation, flexible circuits and aerospace.

3.Coatings and polyurethane resin solvents (industrial grade)

DMAc is used as a solvent in polyurethane coatings, resins and adhesives to help adjust viscosity, improve leveling and adhesion properties, and is also used in the production of artificial leather, synthetic leather and film materials.

4. Industrial grade solvent extraction distillation

DMAc is a solvent for extractive distillation and can be used to separate aromatics such as styrene from C8 fractions. It is an important extractant in petrochemical separations.

5.Polyamide-imide insulating varnish solvent (industry grade)

DMAc is a solvent for the wire and cable insulation varnish industry (polyamide-imide varnishes) for the preparation of high temperature resistant insulating coatings for the motor, transformer and electronic wire industry.

6.Industrial grade lithium battery cathode material preparation solvent

DMAc is used as a solvent during the procedure of manufacturing a lithium-ion battery cathode sheet to facilitate slurry dispersion and film formation. It is used as an auxiliary solvent in the lithium battery manufacturing chain.

7.Solution for stripping semiconductor photoresist (core electronic applications)

High purity electronic grade DMAc is used as a stripping solvent for photoresist in the semiconductor manufacturing process, to remove side wall polymers generated by photoresist and dry etching. It is a valuable constituent of photoresist stripping formulations due to its excellent dissolving power and residue-free evaporation characteristics.

8.Electronic cleaning and etching solvents (electronic grade)

Electronic grade DMAc is used as a solvent in the cleaning and etching of semiconductor wafers and electronic components. It helps to remove trace organic contaminants without damaging the devices and is an important high purity solvent in electronic chemicals.

9. Photosensitive and imaging chemical solvents (industrial grade)

DMAc is used as a solvent and developer in the manufacture of photosensitive chemicals, X-ray and photographic products, in the traditional imaging and specialty photosensitive materials industries.

10. Laboratory uses, reagent grade (reagent grade)

In the laboratory, reagent-grade DMAc is utilized as a polar aprotic solvent for organic synthesis in general, spectroscopic analysis, chromatographic analysis, and polymer research. It is a common solvent used in scientific research laboratories.

11.Other applications

With the development of high-performance materials and the electronics industry, the application scope of DMAc continues to expand, including in the adhesive industry, polymer reaction media, and paint remover formulations.

Summarize

N,N-Dimethylacetamide (DMAc, C4H9NO, CAS No. 127-19-5, EINECS No. 204-826-4) is a colorless, transparent liquid that is completely miscible with water and most organic solvents. Its high boiling point, low volatility, strong solubility, thermal stability, and lack of residual evaporation make it an important polar aprotic solvent used in industrial, electronic, and laboratory fields. In daily life, we encounter it through high-performance fiber products, electronic products and semiconductor chips, coatings, electrical appliances, and imaging products. In applications, DMAc is widely used in synthetic fiber spinning, polyimide films, coatings and polyurethane resins, extractive distillation, insulating varnishes, lithium battery cathode preparation, semiconductor photoresist stripping, electronic cleaning and etching, photosensitive chemicals, and laboratory reagents. It serves as a high-performance solvent bridging "amide solvent chemistry" with "fibers, films, electronics, and semiconductors." However, its reproductive toxicity requires strict protection and compliance control throughout the entire supply chain.