Azo polymerization initiators


CAS : 15545-97-8

low-temperature type oil soluble

Plastics manufacturing


V-70 is an oil-soluble azo polymerization initiator of which 10-hour half-life temperature is 30 ℃.
V-70 can be used as a polymerization initiator for different types of vinyl monomers and a catalyst for organic radical reactions at a low temperature.

  • Oil-soluble azo initiator having low decomposition temperature. An alternative to photo reaction as radical generator.
  • Soluble in various organic solvents
  • With highest polymerization activity among azo initiators available in Wako
  • 10 Hour half-life decomposition temperature: 30℃
Structural formula of 2,2'-Azobis(4-methoxy-2,4-dimethylvaleronitrile)
Chemical name 2,2'-Azobis(4-methoxy-2,4-dimethylvaleronitrile)
CAS RN® 15545-97-8
Molecular weight 308.43
Molecular formula C₁₆H₂₈N₄O₂

Physical characteristics


nearly white
crystalline powder

Melting point 50-96(dec.) °C
10hour half-life decomposition temperature 30℃(in toluene)
Activation energy 109.2 kJ/mol
Frequency factor (ln A) 32.47

water : practically insoluble.
dichloromethane : freely soluble.
acetonitrile, N,N-dimethylformamide : soluble.
methanol, acetone, toluene : slightly soluble.

SADT 30℃

*SADT: Self-accelerating decomposition temperature

Packaging & Storage conditions

Packaging 25kg / 100g
Storage conditions keep under -10℃

Related laws and regulations

TSCA Listed
REACH 01-2120783409-42-0000

Click here for radical reaction using V-70

Here, you can calculate the ‘residue rate’, ‘decomposition reaction time’, and ‘temperature during the decomposition reaction’ of azo polymerization initiators.

Image of Azo Residue Rate Calculation Tool