| 초록 |
Fiber-reinforced composites were successfully used for many decades for all engineering applications. Glass fiber (GF) is a lightweight, extremely strong, and robust material. Although strength is somewhat lower than carbon fiber (CF), GF is typically far less brittle and less expensive. Its bulk strength and weight properties are also favorable when compared to metals. In this work, GFRPs were prepared using hot-pressing or vacuum bagging process. Polyimides (PIs) were used as polymer matrix because of their outstanding mechanical properties, high thermal stability and good chemical resistance etc. Based on SEM images, the composites exhibited good compatibility between PI matrix and GF. To investigate thermal stability, TGA were measured and the data revealed that vacuum bagging process showed higher decomposition temperature (Td) of 622.3℃. Bending and impact strength were measured. Compared to hot-pressing, vacuum bagging process showed higher mechanical properties. |
