Preparation and properties of new poly (methylphenyl silylene aryl ether arylacetylene) resin

Abstract

A poly (methylphenyl silylene aryl ether arylacetylene) (PSEA-P2) resin was synthesized from 1, 4-bis (4’-ethynylphenoxy) benzene and methylphenyldichlorosilane through Grignard reaction. The carbon fiber reinforced PSEA-P2 resin composite was also prepared. The structure of the resin was characterized by proton nuclear magnetic resonance and Fourier transform infrared spectroscopy. The thermal behaviour of the resin was examined by differential scanning calorimetry. The glass transition temperature and heat resistance of PSEA-P2 resin were examined by dynamic thermomechanical analysis and thermogravimetric analysis respectively. The results show that the glass transition temperature and the degradation temperature in N2 are higher than 450 ℃ and 531 ℃ respectively. The processing performance was determined by rotational rheological analysis. The results show that the processing window of PSEA-P2 resin is in the temperature range of 110-175 ℃, which is suitable for compression molding. The cured resin has excellent mechanical strength and heat resistance. The flexural strength of the cured resin is 54.3 MPa. The flexural strength of T300 carbon fiber reinforced composite can reach 518.0 MPa at room temperature, and its retention rate at 400 ℃ is 53%. The good mechanical strength of PSEA-P2 resin is due to the polar aryl ether bonds in molecular chain which enhances the bonding force between the resin and the fiber. On the other hand, the degree of crosslinking after curing is appropriate which reduces the decrease of mechanical properties caused by excessively high degree of crosslinking.

Keywords

• poly (methylphenyl silylene aryl ether arylacetylene) resin
• heat-resistance resin
• advanced resin matrix composite
• high performance resin