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Pyrolysis of polysilanes with different molecularweights, solid states and substituents has been studied by quadrupole mass spectroscopy. The analysis of kinetics on the gas evolution spectra of a unit of the polysilanes gives their activation energies having Gaussian distributions. The number reduction of the weak Si-Si bonds with the decrease of the chain length of polysilanes results in the increase of activation energy of decomposition. The activation energy is also affected by the kind ofdoi:10.2494/photopolymer.11.133 fatcat:eracei7ocfg3rkncxk2cvet2vq