摘要: A novel Polymethoxylsiloxane (PMOS) with dense pendant methoxy groups was synthesized from cyclosiloxane monomers by ring-opening polymerization and dehydrocoupling reaction. Synthesis reactions were followed by IR spectroscopy an... 展开 A novel Polymethoxylsiloxane (PMOS) with dense pendant methoxy groups was synthesized from cyclosiloxane monomers by ring-opening polymerization and dehydrocoupling reaction. Synthesis reactions were followed by IR spectroscopy and 29Si NMR tests. PMOS was incorporated with polydimethylsiloxane (PDMS) via hydrolyzation and condensation to prepare crosslinked polysiloxane, and the apparent activation energy for curing reaction was 3.92 KJ/mol.High-croslinked PMOS phases were in-situ formed and the average crosslink density increased with increasing of the loading of PMOS. It was detected that these PMOS phases improved thermal and mechanical properties of polysiloxane significantly.TG analysis results showed that the temperature at 10 % mass loss for the neat crosslinked PMOS was as high as 760 ℃.Thermal decomposition process of polysiloxane cured with PMOS divided into two stages, and the residual mass at 500 ℃ was 66 wt %. The pyrolysis reaction order was 0.974 and the activation energy for degradation was 78.0 kJ/mol. The crosslink density, tensile stress and elastic module went up as the loading of PMOS increased. Tensile stress and elastic module increase twice and three times, respectively, when the PMOS loading increases from 15.1 wt% to 41.6 wt%. This novel PMOS material is promising for applications in heat resisting resins, adhesives and sealants. 收起