Description

Cyclobis(1,4-Butylene Terephthalate) CAS NO 63440-93-7 is a cyclic oligomer derived from polybutylene terephthalate (PBT), serving as a high-purity monomeric building block. This compound is crucial for the synthesis and modification of advanced polymeric materials, offering precise control over polymer architecture and properties. It is primarily sought by R&D chemists and material scientists in the polymer, specialty plastics, and high-performance resin industries for applications requiring tailored thermal and mechanical characteristics.

Application

• Polymer Synthesis: As a high-purity monomer for the controlled ring-opening polymerization (ROP) to produce linear or branched PBT with specific molecular weights.
• Resin Modification: Used as a reactive additive or chain extender to enhance the thermal stability, crystallinity, and mechanical strength of engineering plastics and thermoplastic polyesters.
• Advanced Material Research: A key intermediate in academic and industrial R&D for developing novel copolymers, block polymers, and polymer networks with customized properties.
• Additive Manufacturing: Potential use in formulating specialized resins for 3D printing to achieve parts with superior heat resistance and dimensional stability.
• Composite Materials: Incorporation into composite formulations to improve the interfacial adhesion between polymer matrices and reinforcing fibers or fillers.
• Chemical Intermediate: Serves as a precise starting material for further chemical derivatization or functionalization in organic synthesis.

Basic Information

Product Name	Cyclobis(1,4-Butylene Terephthalate)
CAS No.	63440-93-7
Molecular Formula	C24H24O8
Molecular Weight	440.44 g/mol
Synonyms	Cyclic PBT Dimer; 2,5-Furandione, dihydro-, 1,4-butanediol polymer, cyclic dimer; Cyclic oligomer of poly(butylene terephthalate); PBT cyclic dimer; 1,4-Butanediol, polymer with 1,4-dihydro-2,5-furandione, cyclic dimer; Cyclic butylene terephthalate dimer; CBT Dimer (PBT-based)
EINECS	Contact for details

Quality Control

Our Cyclobis(1,4-Butylene Terephthalate) is produced under stringent conditions to ensure batch-to-batch consistency and high purity. Quality is verified through comprehensive analytical testing, including chromatography and spectroscopy. A Certificate of Analysis (COA) detailing purity, identity, and impurity profiles is provided with each shipment 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 a controlled room temperature (15-25°C). Due to its hygroscopic nature, the container must be kept tightly sealed after opening to minimize exposure to atmospheric moisture. Keep away from incompatible materials.

Specification

Item	Specification
Appearance	White to off-white crystalline powder
Identification (IR)	Conforms to reference spectrum
Assay (HPLC)	≥ 98.0%
Melting Point	Contact for details
Loss on Drying	≤ 0.5%
Related Substances (HPLC)	Individual impurity ≤ 0.5%; Total impurities ≤ 2.0%

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