Synthesis and Non-isothermal Thermal Decomposition of Polydiphenyl(diphenylethynyl)Silane

Abstract

Diphenyldiphenylethynylsilane monomer (DPDPES) was synthesized with ethyl bromide, diphenyldichlorosilane and phenylacetylene by Grignard reaction. The molecular structure was characterized by FTIR and 1H-NMR spectroscopy. The polymer of polydiphenyl(diphenylethynyl)silane (PDPDPES) was also prepared by thermal polymerization. Non-isothermal thermal decomposition process of PDPDPES was studied with TG-DTG technology via model method to get thermal decomposition function and the corresponding mechanism which was further verified by model-free method. Results show that the apparent activation energy and the pre-exponential factor are about Ea=245.37kJ/mol and lgA=13.78s-1 obtained by six different kinetic methods, respectively. The mechanism of functions are f(α)= 10/23 ·(1-α)·[-ln(1-α)]-1.3 and g(α)=[-ln(1-α)]2.3。

Keywords

• polydiphenyl(diphenylethynyl)silane
• model method
• model-free method
• thermal decomposition mechanism