3,3,4,4-diphenylsulfonetetracarboxylicdianhydride DSDA CAS 2540-99-0

Synonyms: 4,4'-Sulfonyldiphthalic dianhydride; 5,5'-Sulfonylbis(isobenzofuran-1,3-dione); 4,4'-Sulfonyldiphthalic anhydride; Bis-(3-phthalyl anhydride) sulfone; 1,3-Isobenzofurandione, 5,5'-sulfonylbis-; 3,3',4,4'-Diphenyl sulfone tetracarboxylic anhydride

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Product Details

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3,3',4,4'-Diphenylsulfonetetracarboxylic dianhydride (DSDA, CAS 2540-99-0) is primarily employed as a monomer for synthesizing high-performance polyimides, which offer exceptional thermal stability, mechanical strength, chemical resistance, and flame retardancy.

Basic Information of DSDA

Product Name	3,3,4,4-diphenylsulfonetetracarboxylicdianhydride
Abbreviation	DSDA
CAS Number	2540-99-0
Molecular Formula	C16H6O8S
Molecular Weight	358.28 g/mol
Appearance	Off-white to white solid
Purity	≥99%
Package	1kg/bottle, 20kg/drum, or customized
Molecular formula

Key Properties

High thermal stability thanks to aromatic and sulfone linkages
Excellent oxidative / chemical resistance in harsh environments
Rigid structure, giving high dimensional stability
Compatibility with diamines to yield high-performance polyimides and copolyimides
Used to introduce sulfone units into polymer backbone to modulate properties (e.g. increased Tg, mechanical strength)

Key Applications of DSDA

Electronics and Microelectronics: Used in flexible printed circuits, semiconductor packaging (e.g., passivation layers and dielectrics), and display technologies like OLEDs and LCDs for alignment layers and encapsulants.

Aerospace and Defense: Incorporated into lightweight composites for aircraft and spacecraft structural parts, as well as insulation materials for extreme environments.

Automotive: Applied in high-temperature components and protective coatings.

Membrane and Separation Technologies: Utilized in gas separation membranes for processes such as CO₂/CH₄ and O₂/N₂ separations, suitable for natural gas treatment and hydrogen recovery.

Specialty Coatings and Adhesives: Employed in resins for high-temperature and UV-resistant coatings, and in adhesives for bonding metals, ceramics, and composites in electronics or aerospace.

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