Controlled polymerization and properties of linear heat vulcanizing polysinglephenylsiloxane

The high molecular weight(Mw 6.5×105g/mol) polysinglephenylsiloxane(HP-1) was designed and synthesized in this paper.The molecular structure of HP-1 was characterized by Fourier transform infrared spectrometer(FT-IR),solid-state nuclear magnetic resonance(29Si SS-NMR) and liquid nuclear magnetic resonance(1H NMR).Low temperature thermal property and high temperature rheological properties of HP-1 were studied by differential scanning calorimetry(DSC) and rotational rheology(RS).The results showed that the vinyl group and phenyl group content and molecular weight of HP-1 are 0.997mol%,9.98mol% and 8.23×105g/mol,which coincided with the designed values.HP-1 belonged to the class of non-crystalline polymer with glass transition temperature-119.85℃,and it possessed excellent stability and elastic under 250℃.In addition,HP-1 had outstanding damping property at T ≤ 250℃and ω7.7rad/s.