Introduction
Cumyl peroxyneodecanoate (CPND), CAS 26748-47-0, is a peroxyester initiator that combines the initiating efficiency of the peroxyneodecanoate functional group with the cumyl moiety. This structural combination yields a peroxide with decomposition kinetics well-suited to medium-temperature polymerization processes, particularly in the production of PVC and acrylic polymers.
Key Facts: Cumyl Peroxyneodecanoate
- CAS Number: 26748-47-0
- Molecular Formula: C19H30O3
- Molecular Weight: 306.45 g/mol
- Appearance: Colorless to pale yellow liquid
- 10-Hour Half-Life Temperature: ~49 deg C
- 1-Hour Half-Life Temperature: ~68 deg C
- SADT: ~20 deg C
- Storage: Refrigerated, typically below 0 deg C
Physical Properties
| Property | Value |
|---|---|
| Appearance | Colorless to pale yellow liquid |
| Density (20 deg C) | ~0.95 g/cm3 |
| Active Oxygen | ~5.2% (theoretical) |
| Viscosity | Low to moderate |
| Solubility in Monomers | Excellent in styrene, VCM, acrylates |
Key Applications
PVC Suspension Polymerization
CPND is widely used as a medium-temperature initiator for suspension PVC production. Its decomposition kinetics in the 45-60 deg C range enable efficient radical generation throughout the polymerization cycle, producing PVC resin with consistent K-value (molecular weight), good particle morphology, and low fish-eye content.
Acrylic Polymerization
In acrylic resin production, CPND provides effective initiation for solution, bulk, and suspension processes. Its solubility characteristics ensure uniform distribution in the monomer phase, promoting consistent polymerization rates and narrow molecular weight distributions.
Specialty Copolymers
CPND’s reactivity profile makes it suitable for copolymerization processes where two or more monomers with different reactivity ratios require carefully controlled radical flux for compositional uniformity.
Safety and Handling
CPND requires refrigerated storage due to its SADT of approximately 20 deg C. Key handling precautions include:
- Storage at recommended temperature (typically below 0 deg C)
- Temperature monitoring with alarm systems
- Avoidance of contamination with acids, bases, and transition metals
- Use of explosion-proof equipment and grounded handling systems
- FIFO inventory management to ensure product freshness
Frequently Asked Questions
Q: How does CPND compare to other peroxyneodecanoates?
A: CPND’s 10-hour half-life of ~49 deg C places it between the more reactive tert-butyl peroxyneodecanoate (T10h ~46 deg C) and tert-amyl peroxyneodecanoate (T10h ~47 deg C). The cumyl group provides a balance of reactivity and thermal stability, while also generating cumyloxy radicals upon decomposition — these radicals have somewhat different reactivity characteristics compared to the tert-alkoxy radicals from tert-butyl or tert-amyl esters, which can influence initiation efficiency and polymer end-group chemistry.
Key Takeaways
- Cumyl peroxyneodecanoate (CPND, CAS 26748-47-0) is a medium-temperature peroxyester initiator with a T10h of ~49 deg C.
- Primary applications include PVC suspension polymerization and acrylic resin production.
- CPND requires refrigerated storage below 0 deg C due to its SADT of ~20 deg C.
- The cumyl moiety differentiates CPND from other peroxyester initiators in terms of decomposition chemistry.
- Shandong Do Sender Chemicals supplies high-quality CPND for demanding polymerization applications.