Effect of the linking positions on the benzene ring on properties of poly(silane arylether arylacetylene)s

Three aromatic diynes with para-, meta-, and ortho-oxyphenyloxy structures and dichlorodimethylsilane were used to prepare the corresponding poly(silane arylether arylacetylene) (PSEA) resins, that is, ppp-PSEA, pmp-PSEA, and pop-PSEA, and effect of the linking positions on the benzene ring on properties of PSEA resins was explored. The results show that pmp-PSEA and pop-PSEA resins exhibit lower crystallinity but better processability as compared with ppp-PSEA resin. For the cured PSEA resins, the density increases but the maximum water uptake decreases with the change in the linking position of the benzene ring from para-position to meta-position followed by ortho-position. Cured pmp-PSEA and pop-PSEA resins possess higher mechanical property in comparison with cured ppp-PSEA resin. The cured pop-PSEA resin shows the highest flexural strength (68.4 MPa) and flexural modulus (2.75 GPa). Furthermore, three cured resins possess excellent heat resistance with the decomposition temperature (T-d5) of over 505 degrees C.

Automated summary

In this study, three aromatic diynes with different linking positions on the benzene ring were used to prepare PSEA resins. The effects of linking positions on the properties of PSEA resins were investigated. The results showed that the linking position affected the crystallinity, processability, density, water uptake, mechanical properties, and heat resistance of the resins.