Description

4,4'-Bismaleimidodiphenyl Sulfone (44DDS/BMI) is a high-performance bismaleimide monomer and a key building block for advanced thermosetting polyimides. This compound is valued for its exceptional thermal stability, mechanical strength, and chemical resistance, which are critical for demanding engineering applications. It is primarily sought by manufacturers in the aerospace, electronics, and advanced composite materials industries for producing high-temperature adhesives, matrix resins, and encapsulants. Its unique sulfone linkage contributes to enhanced toughness and processability in the final polymeric materials.

Application

• High-Temperature Composite Matrices: Used as a cross-linking agent in bismaleimide (BMI) resins for aerospace and automotive structural components.
• Electronic Encapsulation & Adhesives: Formulated into potting compounds and die-attach adhesives for semiconductors requiring long-term thermal reliability.
• Advanced Thermoset Polymers: Serves as a core monomer for synthesizing polyimide films, coatings, and laminates with superior thermal and dielectric properties.
• Friction Materials & Ablatives: Incorporated into formulations for brake pads and heat shields due to its stability under extreme frictional heat.
• Fiber-Reinforced Plastics (FRP): Acts as a resin matrix for carbon fiber and glass fiber prepregs in high-performance sporting goods and industrial equipment.
• Specialty Chemical Intermediate: Utilized in organic synthesis to create novel polymers and additives with tailored performance characteristics.

Basic Information

Product Name	4,4'-Bismaleimidodiphenyl Sulfone (44DDS/BMI)
CAS No.	126150-38-7
Molecular Formula	C22H14N2O6S
Molecular Weight	434.42 g/mol
Synonyms	4,4'-Bismaleimidodiphenylsulfone; Bismaleimide of 4,4'-Diaminodiphenyl Sulfone; 4,4'-DDS Bismaleimide; BMI-4,4'-DDS; 1,1'-(Sulfonylbis(4,1-phenylene))bis(1H-pyrrole-2,5-dione); 44DDS; Bis(4-maleimidophenyl) Sulfone; 4,4'-Bismaleimidodiphenyl Sulphone
EINECS	Contact for details

Quality Control

Our 4,4'-Bismaleimidodiphenyl Sulfone is manufactured under a strict quality management system. Each batch undergoes rigorous analytical testing to ensure consistency and meets high-purity standards suitable for advanced polymer synthesis. Certificates of Analysis (COA) detailing key parameters such as assay, melting point, and impurity profile are available upon request to support your quality assurance protocols.

Storage

Preserve in a tightly closed container, protected from light. Store in a cool, dry, and well-ventilated area at room temperature (15-25°C). This product is hygroscopic (moisture-sensitive); keep the original container tightly sealed to minimize exposure to atmospheric humidity.

Specification

Item	Specification
Appearance	Yellow to light brown crystalline powder
Identification (IR)	Conforms to structure
Melting Point	≥ 255 °C
Assay (HPLC)	≥ 98.0%
Loss on Drying	≤ 0.5%

Note: Specifications can be tailored. Please contact us for the detailed technical data sheet of a specific grade.