The Study Of Core-shell Rubber Toughened Multi-functional Epoxy Resin And Its Carbon Fiber Composite

The composite maintenance is an important factor affecting the lifecycle cost of the entire material. The aerospace field had an urgentdemand for lightweight, and the use of epoxy-carbon fiber compositematerial became more extensive. The study of composite repair methodsand materials is very urgent and important. Repair resin requires lowviscosity epoxy system, and good stability. Core-shell rubber particlescompared with the traditional liquid rubber， had a good toughnesseffect，which was not affected by the curing process. So it can be used toprepare repair resin.The core-shell rubber has been applied to the bisphenol A epoxyresin adhesive. Due to the complex interaction of the rubber particles andepoxy resin, the field of rubber particle toughened epoxy resin, there arestill many problems.A direct impact on the toughening of fiber reinforcedhigh-strength multi-functional epoxy system.This paper studies the core-shell rubber toughened multi-functionalepoxy resin (AFG90) system preparation process, the relationship between structure and properties, and the core-shell rubber/multi-functional epoxy resin system how to effect the carbon fibercomposites property.Through the research of CSR dispersion process, therheological characteristics, curing behavior, respectively gained therelationship between the performance of the CSR/AFG90/DC systemresin-based body (mechanics, toughness, heat) and composite materialproperties (mechanical properties) and the CSR amount, morphologicalstructure. Compared with the liquid rubber toughening system, the lawsof CSR toughening multi-functional epoxy resin was found. The guidingsignificance of these results is the low pressure liquid composite moldingand high-performance composite repair. The following conclusions weremade：1. After increasing the temperature, AFG90with small molecularweight, high polarity had strong surface interactions with the core-shellrubber，causing the shell swelling. Tg of the CSR shell decreased afterthe swelling, and further accelerated the swelling process, causing theviscosity increases. When the outside temperature was closing to Tg, theshell molecular chain movement is severe and the swelling process isgreatly accelerated. Once the shell had been swelled entirely, the swellingprocess can occur in a lower temperature，so that the core-shell particlescoalescence, and even into the gel.2. Different core-shell rubber due to the shell with the different capacity to hinder AFG90swelling, lead to vary greatly different viscosity.The greater viscosity, the more obvious impede heat transfer. Differentcore-shell rubber with different viscosity would affect the curingbehavior.3. Compared with the traditional liquid rubber, the CSR/multi-functional epoxy resin matrix has the better performances，including mechanics, toughness, and thermal properties in the samerubber amount. The modulus of CSR system which had higher Tg,decreased more slowly than ATBN.Adding a small amount ATBNwasfound to be undivided and precipitated, than it acted as a plasticizer toreduce the modulus, which did not exist in CSR system.4. Modulus controls the±45°tensile strength, compression andshear strength, hole compression strength. Under various conditions tothese tests, the CSR modified system better than ATBNfor in the sameamount the CSR system had the slightly higher modulus.5phrCSR/AFG90/DC had good performance, and may be used in solvent-free lowtemperature and low pressure composite molding process.