Effective Diameter of Added Glass Fiber Into Matrix of Carbon Fiber Reinforced Thermo-Plastics for Improving Mechanical Properties

摘要

The aim of this study is to clarify the effective diameter of added glass fiber intothe matrix of chopped carbon fiber tape reinforced thermo-plastics (CTT) forimproving mechanical properties. Three types of submicron glass fibers of which thediameter were comparatively different were added into PP (polypropylene) withMAPP (Maleic-Anhydride-modified polypropylene) to modify the matrix using twinscrewextruder. The extruded modified resin was formed to the sheet shape with 0.1mm in thickness in a T- die. The diameter of submicron glass fibers were relativelychanged to 0.18, 0.28 and 0.69 μm of three types. The weight content of MAPP andthat of submicron glass fibers were 5 wt% and 3 wt%, respectively. The static bendingstrengths obtained by three point bending tests were improved due to modification ofmatrix with submicron glass fiber. The particles of matrix modified with submicronglass fiber were remained on the carbon fiber protruded from the fracture surface afterbending fracture. This result suggested that adhesive property between matrix andcarbon fiber was improved by the matrix modification with submicron glass fiber. Tocheck the adhesive property, micro-droplet test was performed. Interfacial shearstrength obtained by micro-droplet test was significantly improved when the diameterof added submicron glass fiber was 0.28μm. These results indicated that addingsubmicron glass fiber into matrix was effective for improving mechanical propertiesand the glass fiber whose diameter is 0.28μm as additive for matrix of CTT was mosteffective for improving mechanical properties in a range from 0.18 to 0.69μm indiameter of glass fiber.