Abstract
Propyl-tri(phenylethynyl)silane ((ph-C≡C)3–Si–CH2CH2CH3) monomer (PTPES) was synthesized via Grignard reaction of propyl-trichlorosilane and phenylacetylene in the presence of magnesium and ethylbromide. Its chemical structure was characterized by nuclear magnetic resonance spectroscopy (1H-NMR, 13C-NMR, and 29Si-NMR). The curing behavior and rheological characteristics of the PTPES were analyzed by differential scanning calorimetry (DSC), Fourier transform infrared spectroscopy (FTIR) and rheology techniques. The corresponding kinetic parameters and curing mechanism were also discussed by four well-known kinetic methods, i.e., Kissinger, Ozawa, Flynn–Wall–Ozawa and Friedman methods. Results showed that PTPES possessed a low melting point of 75 °C, a high gelatinization temperature of 333 °C and wide processing window of 258 °C. The cure schedule of PTPES could be determined as follows: (312 °C, 1 h) + (339 °C, 2 h) + (355 °C, 1 h) by dynamic DSC which was further verified by FTIR and rheology. The activation energy E a was calculated as 122.83, 126.88 and 122.17 kJ/mol by Kissinger, Ozawa and Flynn–Wall–Ozawa methods, respectively. The pre-exponential factor lnA and the reaction orders n and m were 23.15 (s−1), 1.43 and 0.36, respectively. The autocatalytic kinetic model was found to be the best description of the curing process by the Friedman method.
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