The aqueous solution polymerization of diallyl dimethyl ammonium chloride (DADMAC) with 2

2′-azobis(2-aminopropane) dihydrochloride as initiator was studied by means of adiabatic calorimetry in a well adiabatic 1.5L Dewar reactor equipped with an anchor stirrer.The temperature of the polymerization medium and the surroundings of the reactor was measured by temperature sensors (Pt-100) and online transmitted to a computer for further data processing.At first

a series of experiments were designed to prove the reliability of adiabatic calorimetry.The homopolymerization of methylmethacrylate(MMA) or styrene (St) initiated by dimethyl 2

2'-azobis(isobutyrate)in toluene was chosen because the polymerization mechanism of this system has been thoroughly studied and all data are already well known (the reaction order of monomers

MMA or St

was considered as m=1

and the reaction order of AZO-initiator used in this study was considered as n=0.5

ist decomposition was a first-order reaction without any by-reaction

so that p=1

γ=0).At 40～60℃ and in the atmosphere of helium

the monomer was polymerized

and the curves of fluid temperature versus time were obtained online

from which Eef

the overall activation energy of the reaction

can be simulated by the adiabatic calorimeter

the the kinetic and thermodynamic parameters Aef and (-△HR) can be calculated by numerical method with the help of the experimental parameters. The comparison between the simulated vaues and the published data proved that the method was easy and reliable.Thereafter

the polymerization of DADMAC system was further investigated

a series of temperature versus time curves were experimentally obtained by changing the initial cncentrations of monomer ([M])0=2.06～2.46mol/L)and the initial temperatures (T0=50～60℃).According to the adiabatic calorimetry the kinetic parameters were easily simulated:m

the order of monomer polymerization was 2.05

and Eef was 108.83kJ/mol

other parameters Aefand (-△HR)were obtained in the same way above. The results showed that the calculated values depending on the simulated kinetic and thermodynamic parameters were coincident with the experimental data.