Synthesis and Properties of a Silicon-Containing Arylacetylene Resin with 2,6-Diphenoxypyridine Unit

A novel silicon-containing arylacetylene resin called poly(dimethylsilylene-ethylene-phenoxypyridyloxy-phenylene-ethylene) (PSPPY) was made from 2,6-bis(4-ethynyl-phenoxy) pyridine and dimethyldichlorosilane by Grignard reactions. The structure and properties of the resin were characterized by H-1-NMR, FT-IR, GPC, XRD, DSC, TGA and universal testing machine. The resin has a wide processing window ranged from 35 degrees C to 155 degrees C. The cured resin shows excellent mechanical property, low dielectric property and high thermal stability. The flexural strength of the cured resin at room temperature reaches 58.7 MPa. The cured resin has dielectric constant 3.0-3.5, dielectric loss 0.008-0.040 in the frequency of 10(-1)-10(6) Hz, and low water uptake (0.8 %). The degradation temperature at 5 % weight loss and the residue at 800 degrees C of the cured resin arrive at 500 degrees C and 77.1 % in nitrogen atmosphere, respectively.