Description

4,4'-Thiodianiline CAS NO 139-65-1 is a high-purity aromatic amine derivative featuring a central thioether linkage, serving as a critical building block in advanced polymer synthesis. This compound is valued for its ability to impart unique thermal and mechanical properties to high-performance materials. It is primarily sought by manufacturers in the polymer, resin, and specialty chemical industries for developing products that require enhanced durability and specific functional characteristics.

Application

• Polymer Intermediate: A key monomer for the production of polyimides, polyamides, and other high-temperature engineering plastics.
• Epoxy Curing Agent: Used as a hardener in epoxy resin systems, contributing to improved thermal stability and chemical resistance in coatings and composites.
• Liquid Crystal Polymer (LCP) Synthesis: Serves as a diamine component in the manufacture of LCPs for electronics and precision components.
• Photoresist and Electronic Chemicals: Employed in the synthesis of photosensitive polymers and materials for semiconductor fabrication.
• Dye and Pigment Intermediate: Acts as a precursor in the synthesis of certain sulfur-containing dyes and organic pigments.
• Pharmaceutical Intermediate: Utilized in research and development for creating novel active pharmaceutical ingredients (APIs).
• Adhesive and Sealant Formulations: Incorporated to enhance the performance and longevity of industrial adhesives.

Basic Information

Product Name	4,4'-Thiodianiline
CAS No.	139-65-1
Molecular Formula	C12H12N2S
Molecular Weight	216.30 g/mol
Synonyms	4,4'-Diaminodiphenyl sulfide; Bis(4-aminophenyl) sulfide; 4-Aminophenyl sulfide; p,p'-Thiodianiline; DADPS; 4,4'-Sulfonyldianiline (Note: this is a common misnomer, correct for sulfone); Thiobis(4-aminobenzene); 4,4'-Diaminophenyl sulfide
EINECS	205-370-9

Quality Control

Our 4,4'-Thiodianiline is manufactured under a strict quality management system. Each batch undergoes comprehensive analytical testing, including HPLC for purity and identity confirmation, to ensure it meets precise customer specifications and industry standards. A detailed Certificate of Analysis (COA) documenting purity, physical properties, and impurity profiles is provided with every shipment.

Storage

Preserve in a tightly closed container, protected from light. Store in a cool, dry, well-ventilated area at room temperature (15-25°C). Keep away from strong oxidizing agents, acids, and moisture. Under these conditions, the product remains stable for extended periods.

Specification

Item	Specification
Appearance	Light yellow to beige crystalline powder
Identification (IR)	Conforms to structure
Assay (HPLC)	≥ 98.0%
Melting Point	106 - 110 °C
Loss on Drying	≤ 0.5%
Heavy Metals (as Pb)	≤ 20 ppm
Residue on Ignition	≤ 0.1%

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