柔性缓冲层对T300／BADCy复合材料力学性能影响研究

为增强T300/BADCy复合材料的界面性能,用E51环氧树脂/丙酮溶液对T300纤维进行表面处理,在T300/BADCy复合材料界面处能形成柔性的口恶唑啉酮五元环缓冲层。利用红外光谱法研究环氧树脂与氰酸酯树脂的反应机理,并比较不同浓度E51环氧树脂处理液对复合材料力学性能的影响,发现经5wt%浓度的E51环氧液处理的T300/BADCy复合材料层间剪切强度提高了16%,弯曲强度提高了4%,当处理液的浓度大于5wt%时,T300/BADCy复合材料的力学性能有所下降。采用扫描电镜研究处理前、后T300/BADCy复合材料层间剪切断口形貌,发现未处理的T300/BADCy树脂复合材料断口的界面处存在明显裂纹,处理后的复合材料界面没有裂纹,且断裂主要发生在树脂基体内部。

Effects of soft buffer layer on the mechanical properties of T300/BADCy composite

The surface of T300 fiber was treated by epoxy resin E51-acton solution to improve the interface properties of the T300/BADCy composites. A soft buffer layer of oxazolidinone was formed on the surface of T300 fiber as the BADCy resin reacted with the epoxy resin coating there. The mechanism of the reaction between BADCy resin and epoxy resin was studied by FTIR. Influences on the mechanical properties of T300/BADCy composite by treatable solution of different concentration were compared. When the concentration of the treatable solution was 5wt%, inter-laminar shearing strength of T300/BADCy composite could be raised by 16%; the flexural strength was also increased by 4%. When the concentration of the treatable solution was >5wt%, the ILSS and flexural strength of T300/BADCy was descended. The shearing fracture images of T300/BADCy composite with or without treated by epoxy resin E51-acton solution were studied by SEM. It was found that there were some cracks and gaps in the interface of untreated T300/BADCy composite,few cracks and gaps exist in the treated T300/BADCy composite fracture, and the break was mainly occurred inside the resins.