The water-soluble azo initiator

2

2'-azobis (2-methylpropiondodecylamidine) dihydrochloride (AIBL)

with twelve alkyl carbon chain at the both ends

was prepared through Pinner reaction

using AIBN and n-Dodecylamine as main reactants.The structure and purity of AIBL were characterized by 1H-NMR

elemental analysis (EA) and HPLC.The thermal decomposition and thermal decomposition kinetics were studied with DSC

TGA and UV spectrophotometer.The surface activity was determined by surface tension-meter.These results show that the synthesized initiator AIBL has a desirable structure and a high purity.Its thermal decomposition belongs to the first order reaction with the activation energy of thermal decomposition is 134.80 kJ/mol

and the half-life period of it at 70℃in water is about 4 h.Its aqueous solution shows that the surficial activity with the CMC is 0.13 g/L and the corresponding surface tension is 33.57 mN/m.The hydrophobically end-capped aqueous polymers SPAM were prepared using acrylamide as monomer and AIBL as initiator agent.The conversion rate of AM was studied by using the bromide method.The association effect of SPAM was studied with Ubbelohde viscosity

zero shear viscosity and fluorescence probe.The results show that AIBL has favourable ability to initiate polymerization of acrylamide.SPAM

compared with PAM which was synthesized by Initiator without hydrophobically long chain

has obviously hydrophobically associative effect

which indicated that AIBL has successfully introduced the hydrophobically long chain into the polymer end

forming hydrophobically end-capped polymer.