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Bis(4-hydroxyphenyl) sulfone (3-dione) is an organic compound, white needle crystal. Easily soluble in aliphatic hydrocarbons, soluble in ethanol, isopropanol, 2-ethylhexanol, acetonitrile, acetone, slightly soluble in aromatic hydrocarbons, slightly soluble in ethyl acetate, methyl isobutyl ketone, insoluble in toluene, water. It has two phenolic functional groups flanking the sulfonyl group. It is commonly used to cure fast-drying epoxy adhesives. It is classified as a bisphenol, a close molecular analogue of bisphenol A (BPA). BPS is distinguished from BPA by having a sulfone group (SO2) as the central linker of the molecule instead of a dimethylmethylene group (C(CH3)2), as is the case with bisphenol-A.
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Chemical Formula |
C12H10O4S |
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Exact Mass |
250 |
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Molecular Weight |
250 |
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m/z |
250 (100.0%), 251 (13.0%), 252 (4.5%) |
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Elemental Analysis |
C, 57.59; H, 4.03; O, 25.57; S, 12.81 |
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Bis(4-hydroxyphenyl) sulfone is mainly used as a high-efficiency color fixing agent in textile dyeing and finishing industries. With stable phenolic hydroxyl structure and excellent chemical stability, it can form stable complex bonds with dye molecules and fiber macromolecules. It effectively improves the color fastness of dyed fabrics, including washing fastness, rubbing fastness and light fastness, and prevents color fading and color migration during subsequent use and finishing processing.
It serves as a functional auxiliary material widely applied in industrial coatings, leather modification, dye intermediate synthesis and metal plating industries.
In coatings, it enhances the heat resistance and weather resistance of coating films; in leather processing, it modifies leather fiber structure to improve texture softness and durability; in metal plating, it acts as a brightening additive to optimize the surface flatness and gloss of plated layers.
It acts as a core functional monomer for the synthesis of high-performance polysulfone resin. Its unique sulfone group and biphenyl rigid structure can significantly improve the thermal stability, mechanical strength, chemical corrosion resistance and creep resistance of polymer materials. It is an essential monomer raw material for preparing high-temperature resistant and high-transparency polysulfone engineering plastics.
It has diverse auxiliary functions in industrial production. It can be used as plating solution stabilizer and additive to refine metal plating crystals, as leather tanning agent to improve leather shrinkage temperature and structural stability, and as high-temperature dispersant for disperse dyes to ensure uniform dye dispersion and stable coloring under high-temperature dyeing conditions. In addition, it can accelerate the curing reaction of phenolic resin, and endow resin materials with excellent flame retardant and high temperature resistance properties.
It is an important fine chemical intermediate widely used in the synthesis of pesticides, industrial dyes and functional auxiliaries.
Its active phenolic hydroxyl group can participate in esterification, condensation and other organic reactions, providing stable structural skeletons for the preparation of high-efficiency pesticide intermediates, high-color-fastness dyes and special textile auxiliaries, and improving the comprehensive performance of downstream chemical products.
As a safe and high-performance alternative to bisphenol A, it can be used as a key raw material for the polymerization of polycarbonate, epoxy resin, polyester, phenolic resin, polysulfone and polyethersulfone.
Compared with bisphenol A, it has better high-temperature resistance, oxidation resistance and environmental safety, and can prepare high-performance polymer materials suitable for high-temperature, high-pressure and corrosion-resistant industrial scenarios.
It is also applied in the field of fine functional materials, including the manufacturing of color photographic photosensitive materials, photographic contrast intensifiers and thermosensitive recording color developers. Meanwhile, it can be formulated into daily chemical surfactants and high-efficiency deodorants. Its stable molecular structure ensures good compatibility and durability in functional materials, meeting the preparation requirements of high-precision recording materials and daily chemical products.
Method 1: the synthetic method of bis(4-hydroxyphenyl) sulfone epoxy resin, synthesizes bisphenol S epoxy resin by one-step method of phase transfer catalyst, and the specific steps of this synthetic method are as follows:
(1)Feeding: Add a certain amount of 125g of bisphenol S, 700g of epichlorohydrin and 3g of tetrabutylammonium bromide into a four-necked flask equipped with a stirring paddle, a thermometer and a condenser, and mix and stir evenly in the four-necked flask , then dropwise add the catalyst sodium hydroxide that accounts for 2% of raw material total amount in flask.
(2) Control the reaction conditions: raise the temperature to 80°C to carry out the synthesis reaction, and react for 1 hour.
(3) Synthetic product: after the above reaction, the reactant solution was left at room temperature for 20 hours to obtain 795 g of a white precipitated product.
Method 2: the method for bisphenol S epoxy resin, comprises the process of synthesis and aftertreatment, is characterized in that:
(1) Mix bisphenol S and epichlorohydrin with a molar weight of 1:2 to 20 in a three-necked flask equipped with a condenser tube and a thermometer, wherein the bisphenol S is dissolved in a solvent.
(2) Control the reaction temperature at 0° C. to 80° C., dropwise add alkali substances, the molar ratio of alkali to bisphenol S is 1 to 3:1, and dissolve with a solvent.
(3) After reacting for 0.5 to 50 hours, filter under reduced pressure to obtain a solid.
(4) adding deionized water to repeatedly wash the product, so that the pH value of the washing liquid is 6-8, and bisphenol S epoxy resin is obtained.
Future Considerations and Innovations
Development of BPS Analogs and Alternatives
Researchers are exploring BPS analogs with improved properties, such as reduced toxicity, enhanced solubility, or increased reactivity. These analogs aim to expand the applications of BPS while addressing environmental and health concerns.
1) Green Chemistry Approaches:
The development of eco-friendly synthetic routes for BPS and its analogs, using renewable feedstocks and minimizing waste, aligns with global sustainability goals. Biocatalytic methods and solvent-free reactions are among the approaches being investigated.
2) Toxicity Reduction:
By modifying the chemical structure of BPS, researchers aim to reduce its potential toxicity while maintaining or enhancing its desirable properties. This may involve substituting functional groups or altering the molecular architecture.
Biodegradable Polymers and Materials
Incorporating BPS into biodegradable polymer systems could address environmental concerns associated with traditional plastics. Research is ongoing to develop BPS-based polymers with enhanced biodegradability without compromising performance.
1) Compostable Packaging
BPS-derived high-performance biodegradable polymers can be widely applied in the preparation of fully compostable green packaging materials, replacing traditional petroleum-based plastic packaging. These innovative packaging materials can undergo complete microbial degradation under industrial and household composting conditions. During the degradation process, the polymer chain is gradually broken down into harmless small molecular substances, which can be further transformed and absorbed by soil microorganisms, eventually returning organic nutrients to the soil ecosystem.
This characteristic effectively reduces plastic waste accumulation, alleviates white pollution, and realizes the full life-cycle environmental sustainability of packaging materials.
2) Sustainable Composites
In advanced composite material manufacturing, BPS-modified biodegradable polymers can serve as high-performance green matrix materials to replace traditional non-degradable resin matrices such as epoxy and phenolic resins. Combined with natural fiber fillers and biodegradable reinforcing phases, they can fabricate fully sustainable composite materials with low carbon emissions and environmental friendliness.
These sustainable composites maintain outstanding structural rigidity, corrosion resistance and thermal stability during service, and can achieve natural degradation after being discarded. They significantly reduce the environmental footprint of industrial composite materials and are suitable for green manufacturing, ecological construction and environmentally friendly industrial equipment applications.
Nanotechnology Integration
Exploring the use of BPS in nanomaterials and nanocomposites may lead to breakthroughs in energy storage, catalysis, and biomedical applications. BPS-derived nanoparticles could offer unique properties for targeted drug delivery or advanced sensors.
1) Drug Delivery Nanoparticles:
BPS-based nanoparticles could be engineered to encapsulate and deliver drugs to specific tissues or cells, improving therapeutic efficacy and reducing side effects. Their biocompatibility and tunable properties make them promising candidates for drug delivery systems.
2) Catalytic Nanomaterials:
In catalysis, BPS-derived nanomaterials could serve as efficient catalysts for chemical reactions, offering high activity and selectivity. Their stability and recyclability make them attractive for industrial applications.
Bis(4-hydroxyphenyl) sulfone (a compound with a unique chemical structure, CAS number 80-09-1) is an organic compound with a molecular formula of C₁₂H₁₀O₄S and a molecular weight of 250.27 g/mol. This compound is formed by connecting two 4-hydroxyphenyl groups through the sulfone group (-SO₂-). Its chemical properties mainly manifest in aspects such as physical state, solubility, thermal stability, acidity and basicity, and reactivity.
Physical state and appearance
3-Dione appears as white needle-like crystals or powder at room temperature, with a definite crystal structure. It has a relatively high melting point, usually ranging from 245°C to 250°C, indicating strong intermolecular forces and a stable crystal structure. The boiling point is as high as 505.3°C (760 mmHg), further confirming its thermal stability. The density is approximately 1.4 g/cm³ (25°C), and the vapor pressure is extremely low (0.0±1.3 mmHg at 25°C), indicating that the compound is not volatile at room temperature and is suitable for storage in a sealed environment.
Thermal stability and chemical stability
3-Dione exhibits excellent thermal stability. Its high melting point and boiling point enable it to maintain structural integrity at high temperatures. The sulfone group (-SO₂-) acts as a strong electron-withdrawing group, stabilizing the molecular structure through an inducing effect and reducing the possibility of thermal decomposition or oxidation reactions. Additionally, this compound is stable to air, light, and most chemical reagents (such as dilute acids and dilute bases) at room temperature, but it may degrade in the presence of strong oxidants or reductants.
Acid-base property
The two hydroxyl groups in the molecule confer weak acidity to 3-dione. The strong electron-withdrawing effect of the sulfone group reduces the electron cloud density on the hydroxyl oxygen, thereby enhancing the polarity of the O-H bond and facilitating the release of hydrogen ions (H⁺). Therefore, its acidity is stronger than that of common phenolic compounds (such as phenol), but weaker than that of carboxylic acids. This property enables it to serve as a catalyst or reactant in certain reactions that require weak acidic conditions.
Reactivity
The chemical reactivity of 3-dione is mainly concentrated on the hydroxyl group and the sulfone group:
Hydroxyl reaction: It can participate in esterification, etherification, acylation and other reactions. For example, it can react with acyl chloride to form ester derivatives, or react with halogenated hydrocarbons to form ether compounds.
Sulfonyl reaction: The strong electron-withdrawing effect of the sulfonyl group makes it a potential attack site for electrophilic reagents. Under specific conditions, the sulfonyl group can be reduced to sulfone or thioether, or other functional groups can be introduced through nucleophilic substitution reactions.
Polymerization reaction: As a bisphenol compound, 3-dione can be used to synthesize high-performance engineering plastics such as polysulfone and polyether sulfone. The hydroxyl group of it can undergo condensation polymerization with diphenyl sulfonyl dichloride to generate polysulfone resin, which has excellent heat resistance, mechanical strength and chemical stability.
Storage conditions
To maintain the chemical stability of 3-dione, it is recommended to store it in a dry environment at 4°C; for long-term preservation, -4°C conditions are more ideal. The storage container should be tightly sealed to prevent contact with strong oxidants, reductants or humid air.
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