耐高温端乙炔基聚醚酰亚胺改性含硅芳炔树脂

采用预共聚法，以含硅芳炔树脂（PSA）和端乙炔基聚醚酰亚胺（PEI）为原料，制备了端乙炔基聚醚酰亚胺改性的含硅芳炔（PEI-PSA）树脂及其与T300碳纤维平纹布的复合材料T300/PEI-PSA。通过动态热机械分析（DMA）和X射线能谱仪（EDS）研究了溶剂、溶液浓度、反应温度对预共聚反应的影响，确定了预共聚反应的最佳条件，得到了均匀分散的PEI-PSA树脂。通过红外光谱（FT-IR）、核磁共振氢谱（¹H-NMR）、差示扫描量热（DSC）、热失重（TG）、DMA和EDS等表征了PEI、PEI-PSA树脂及T300/PEI-PSA复合材料的结构和性能。结果表明，当PEI质量分数为20%时，PEI-PSA树脂浇铸体的弯曲强度达44.5 MPa，较PSA树脂浇铸体提高了90.2%；T300/PEI-PSA复合材料的弯曲强度达602.7 MPa，较T300/PSA复合材料的弯曲强度提高了124%。

Silicon-Containing Arylacetylene Resin Modified by High Temperature Acetylene-Terminated Polyetherimide

Using silicon-containing arylacetylene resin(PSA) and acetylene-terminated polytherimide(PEI) as raw materials, the modified silicon containing arylacetylene resin (PEI-PSA) with an acetylene-terminated polyetherimide and the T300/PEI-PSA carbon fiber reinforced composite were prepared by pre-copolymerization. Effects of solvent, reaction temperature and solution concentration on the pre-copolymerization and the dispersion of PEI in PSA were investigated by Dynamic Mechanical Analysis (DMA) and Energy Dispersive X-ray Spectroscopy (EDS). The optimum conditions of the pre-copolymerization were determined and the uniform PEI-PSA resin was obtained. The structures and properties of PEI, PEI-PSA resin and T300/PEI-PSA composites were characterized by Fourier Transform Infrared (FT-IR) spectra, Hydrogen Nuclear Magnetic Resonance (¹H-NMR), Differential Scanning Calorimetry (DSC), Thermogravimetric (TG) analysis, DMA and EDS. Results showed that when the mass fraction of PEI in PEI-PSA resin was 20%, the flexural strength of the produced PEI-PSA resin casting reached 44.5 MPa and increased by 90.2%, as compared with the PSA resin casting. The flexural strength of the T300/PEI-PSA composite reached 602.7 MPa and increased by 124%, as compared with the T300/PSA composite.