Tert-Butyl Peroxypivalate is a peroxyester organic peroxide used as a thermal free-radical initiator for selected polymerization processes. CAS 927-07-1, molecular formula C₉H₁₈O₃ and molecular weight 174.24 g/mol define the chemical identity. Its thermal decomposition profile provides a reference for matching initiator activity with polymerization temperature and residence time. Applications include ethylene, vinyl chloride, vinylidene chloride, acrylate and methacrylate polymerization systems.
Product Identification
Chemical Identity
Tert-Butyl Peroxypivalate is a peroxyester with a defined temperature-dependent decomposition profile.
CAS Number
CAS 927-07-1 identifies the active chemical substance for technical specifications and regulatory documentation.
Product Family
The product belongs to the Peroxyesters group within Organic Peroxides.
Key Technical Parameters
|
Parameter |
Reference Value |
|
Chemical Name |
Tert-Butyl Peroxypivalate |
|
CAS Number |
927-07-1 |
|
Molecular Formula |
C₉H₁₈O₃ |
|
Molecular Weight |
174.24 g/mol |
|
Theoretical Active Oxygen |
9.18% |
|
Half-Life at 10 h |
57°C |
|
Half-Life at 1 h |
75°C |
|
Half-Life at 1 min |
111°C |
Initiator Selection
Temperature Matching
Compare the process temperature with the half-life profile to determine the expected decomposition rate under operating conditions.
Residence Time
Residence time determines how long the initiator remains available for decomposition. The 10-hour, 1-hour and 1-minute reference points help assess this relationship.
Dosage Basis
Dosage should be calculated from the active peroxide concentration of the selected formulation together with monomer type, reaction temperature and target conversion.
Polymerization Applications
Ethylene Polymerization
Tert-Butyl Peroxypivalate is used in high-pressure ethylene polymerization. Its decomposition profile can support initiator selection across reaction zones with different temperature requirements.
Vinyl Chloride
The product is used in vinyl chloride polymerization systems where initiation temperature and reaction time are important process variables.
Acrylate and Methacrylate Systems
The peroxide is applicable to selected acrylate and methacrylate polymerization processes. Grade concentration and dosage depend on the reaction formulation and operating conditions.
Process Matching
Reaction Temperature
Process temperature is the primary variable for estimating peroxide decomposition. The half-life profile provides reference points for this assessment.
Residence Time
Match decomposition rate with the available reaction time. This helps determine whether the selected initiator can provide the required radical generation within the process window.
Initiator System
Where multiple initiators are used, their individual decomposition profiles can be coordinated according to reaction temperature and residence time.
Product Specification Control
Assay
For formulated grades, peroxide assay defines the concentration of active peroxide in the supplied material and provides the basis for dosage calculations.
Active Oxygen
The theoretical active oxygen content of the neat chemical is 9.18%. Actual active oxygen for a formulated grade depends on its peroxide concentration.
Appearance
The chemical is described as a clear liquid in published technical specifications. Grade-specific appearance requirements should follow the applicable product specification.
Storage and Handling
Temperature Control
Storage temperature should be controlled according to the selected formulation because peroxide decomposition is temperature dependent.
Packaging
Use the specified packaging for the applicable grade and keep containers properly closed during storage and handling.
Transportation
Transportation conditions depend on peroxide concentration and formulation. The applicable SDS and transport documentation should be reviewed before shipment.
Documentation for Qualification
Technical Data
Technical evaluation should cover CAS number, molecular formula, molecular weight, assay, active oxygen, appearance and half-life data.
Safety Documentation
SDS documentation provides the information required for storage, handling, transportation and emergency procedures.
Process Data
The monomer, polymerization temperature, residence time, target conversion, initiator dosage and required concentration provide the main inputs for technical matching.
FAQ
Q: What is Tert-Butyl Peroxypivalate used for?
A: It is a thermal free-radical initiator used in selected ethylene, vinyl chloride, vinylidene chloride, acrylate and methacrylate polymerization systems.
Q: What is the CAS number?
A: The CAS number is 927-07-1.
Q: What are the half-life temperatures?
A: The reference half-life temperatures are 57°C at 10 hours, 75°C at 1 hour and 111°C at 1 minute.
Q: Is the product supplied as a pure peroxide?
A: Commercial grades may be supplied as formulated peroxide solutions. The peroxide concentration, formulation and applicable specification should be confirmed for the selected grade.
Q: What information is needed for technical evaluation?
A: The monomer system, polymerization temperature, residence time, target conversion, initiator dosage and required peroxide concentration provide the key process information for grade selection.
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