含硅芳炔树脂的改性及复合材料性能

Modification of Silicon-Containing Arylacetylene Resin and Properties of Carbon Fiber Reinforced Composites

合成了苯乙炔全封端含硅芳炔树脂(FEC-PSA)和含炔丙氧基苯并口恶嗪(P-appe),通过与含硅芳炔树脂(PSA)混合得到了4种不同共混质量比的改性含硅芳炔树脂,用模压成型制备了单向T800碳纤维增强改性含硅芳炔树脂复合材料。利用红外光谱、核磁共振氢谱、差示扫描量热分析和热重分析等方法对改性含硅芳炔树脂及其复合材料的结构和性能进行了研究。结果表明,共混树脂的黏度随温度的升高和加入P-appe质量分数增加而明显下降。当P-appe质量分数为30%时,共混树脂固化物5%热失重温度(Td5)为531℃,800℃残留率为85%;共混树脂浇铸体的弯曲强度为41.5 MPa,冲击强度达5.5 kJ/m2;改性PSA树脂经T800碳纤维增强,其复合材料的弯曲强度和弯曲模量在常温下为1557 MPa和153 GPa,层间剪切强度为66 MPa。

A fully phenylacetylene end-capped silicon-containing arylacetylene resin(FEC-PSA) and a propargyloxy-containing benzoxazine(P-appe) were synthesized and used to blend with silicon-containing arylacetylene resin(PSA) to prepare four kinds of modified silicon-containing arylacetylene resins by physical mixing. The unidirectional T800 carbon fiber reinforced modified PSA resin composites were prepared by hot press molding. The structure and properties of modified PSA resins and composites were studied by FT-IR, 1H-NMR, DSC, TGA and so on. The results show that the viscosity of the blended PSA resins decreases markedly with increasing temperature as well as increasing mass fraction of P-appe in the blended resins. The temperature at 5% mass loss(Td5) and residual yield at 800 ℃ of the cured blended resin(PFP-3) with 30% mass fraction of P-appe are 531 ℃ and 85%, respectively. The flexural strength and impact strength of the cured PFP-3 resin are 41.5 MPa and 5.5 kJ/m2, respectively. The flexural strength, flexural modulus and interlayer shear strength of the unidirectional T800 carbon fiber reinforced PFP-3 composite are 1557 MPa, 153 GPa and 66 MPa at room temperature, respectively.