Azo polymerization initiators


CAS : 1400693-47-1

non-nitrile non-halogen water soluble

Plastics manufacturing


VA-057 is a water-soluble azo polymerization initiator which has a zwitterinoic structure. The 10-hour half-life temperature is 57 ºC, which allows a polymerization under a mild condition. As a non-halogenated initiator, VA-057 is uniquely characterized by not causing any concerns about coloring of polymer or corrosion of polymerization facilities with halogen. Since the product has a zwitterionic structure, formation of both cationic and anionic latex is expected.

  • Potential for introducing carboxyl group into terminal of polymer
  • Zwitterionic structure
  • Can be used in a wide pH range(pH3~9)
  • 10 Hour half-life decomposition temperature: 57℃
structural formula of 2,2'-Azobis[N-(2-carboxyethyl)-2-methylpropionamidine]tetrahydrate
Chemical name 2,2'-Azobis[N-(2-carboxyethyl)-2-methylpropionamidine]tetrahydrate
CAS RN® 1400693-47-1
Molecular weight 414.46
Molecular formula C14H34N6O8

Physical characteristics


white - pale yellow
powder - crystalline powder

Melting point/freezing point 97(dec.) °C
10hour half-life decomposition temperature 57℃(in water)
Activation energy 122.7 kJ/mol
Frequency factor (ln A) 33.88

water, methanol : freely soluble.
ethanol, isopropanol, acetone, toluene : very slightly soluble.

SADT  75℃

*SADT: Self-accelerating decomposition temperature

Packaging & Storage conditions

Packaging 5kg / 500g
Storage conditions keep under 10℃

Related laws and regulations

TSCA Not Listed
EINECS Not Listed
REACH Not Listed

Aqueous solution polymerization of acrylamide at different pH values

Graph showing that polymerization proceeds at pH 3-9

Polymerization progresses at pH 3 to 9.

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