Study On Mechanism And Dynamic Of Rubber Pyrolysis

The relationship between pyrolysis production and temperature of nature rubber isoprene rubber and butadiene rubber was investigated by Pyrolysis Gas-Chromatography-Mass Spectrometry(Py-GC-MS) . The pyrolysis mechanism of nature rubber, isoprene rubber and butadiene rubber was analysis by pyrolysis production.The pyrolysis dynamics of nature rubber , isoprene rubber and butadiene rubber was investigated by thermogravimetry analysis(TG)and differential thermogravimetry analysis(DTG). Use the relationship between the different weight-loss rate at the same weight-loss under different heating rate and time to calculate the activation energy. The heat energy of pyrolysis was studied by differential scanning calorimetry (DSC) at same time. The activation energy was also calculated by the temperature of peak on DSC curve at different heating rates.The results turned out that pyrolitic temperature has great affection on the out come of pyrolysis. The monomer and di- monomer in the out come increase with the adding of heating rate. There are few random rupture fragments in the production at the higher temperature. Thepyrolitic mechanism of nature rubber is similar with it of isoprene rubber. There are mainly isoprene monomer and 1,4-dimethyl-4-ethenyl cyclohexene in the out come of pyrolysis of nature rubber and isoprene rubber. There are mainly butadiene and 4-ethenyl cyclohexene in the out come of pyrolysis of butadiene rubber. The temperatures of peak in TG curves and DTG curves all increase with the adding of heating rate. The pyrolitic activation energies of nature rubber and isoprene calculated by TG-DTG date are similar. The activation energy of nature rubber pyrolysis is E=240.8 kJ/mol-1, the activation energy of isoprene rubber pyrolysis is E=248.0 kJ/mol-1. The activation energies of two step butadiene rubber pyrolysis is El=219.5 kJ/mol-1 E2=229.2 kJ/mol-1 respectively. The temperatures of peak on the DSC curves increase with the increase of heating rate. The activation energy calculated by DSC date is bigger error than it calculated by TG-DTG date.