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(1 H-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 .