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| 1 | Adhesion of PBO Fiber in Epoxy Composites显示文摘The high mechanical and thermal performance of poly p-phenylene-2, 6-benzobisoxazole(PBO) fiber provides great potential applications as reinforcement fibers for composites. A composite of PBO fiber and epoxy resin has excellent electrical insulation properties, therefore, it is considered to be the best choice for the reinforcement in high magnetic field coils for pulsed magnetic fields up to 100 T. However, poor adhesion between PBO fiber and matrix is found because of the chemically inactive and/or relatively smooth surface of the reinforcement fiber preventing efficient chemical bonding in the interface, which is a challenging issue to improve mechanical properties. Here, we report the surface modification of PBO fibers by ultraviolet (UV) irradiation, O2 and NH3 plasma, as well as acidic treatments. The interfacial adhesion strength values of all the treatments show the similar level as determined for aramid fibers by pull-out tests, a significant impact on fiber-matrix-adhesion was not achieved. The surface free energy and roughness are increased for both sized and extracted fibers after plasma treatments together with maleic anhydride grafting. The sized fiber shows marginal improvement in adhesion strength and no change in fiber tensile strength because of the barrier effect of the finish. For the extracted fiber, different surface treatments either show no apparent effect or cause reduction in adhesion strength. Atomic force microscopy (AFM) topography analysis of the fracture surfaces proved adhesive failure at the fiber surface. The fiber surface roughness is increased and more surface flaws are induced, which could result in coarse interface structures when the treated fiber surface has no adequate wetting and functional groups. The adhesion failure is further confirmed by similar adhesion strength and compression shear strength values when the fiber was embedded in various epoxy resins with different temperature behavior. The tensile strength of fiber is sensitive to surface treatment conditions as revealed by a bimodal Weibull statistical distribution analysis. Considerable strength reduction occurred, particularly for cases of acidic and plasma treatments, while UV irradiation shows the better ability to retain fiber strength. | MADER Edith MELCHER Steffen 刘建文 高尚林 | 2007 | Journal of Donghua University(English Edition)2007，24，2： | 4 |
| 2 | Commingled yarns of surface nanostructured glass and polypropylene filaments for effective composite properties显示文摘 | Mader Edith Rothe Christina Shang - Lin Gao | 2007 | J Mater Sci2007，42，19： | 1 |
| 3 | Charaeterisation of interphase nanoscale property variations in glass fibre reinforced polypropylene and epoxy resin composites显示文摘 | Shanglin Gao Edith Mader | 2002 | Composites2002，，： | 1 |
| 4 | Characterization of fiber/ma- trix interface strength: applicability of different tests, approaches and parameters显示文摘 | Serge Zhandarov Edith Mader | 2005 | Composites Science and Technology''2005，65，1： | 1 |
| 5 | Characterization of fiber/matrix interface strength: applicability of different tests, approaches and parameters显示文摘 | Serge Zhandarov Edith Mader | 2005 | Composites Science and Technology2005，65，： | 1 |
| 6 | Indirect estimation of fiber/ polymer bond strength and interracial friction from maximum load values recorded in the microbond and pull-out tests Ⅱ: Critical energy release rate 显示文摘 | Zhandarov Serge Mader Edith | 2003 | Adhesion Sci and Technol2003，17，7： | 1 |
| 7 | Prospect of nanoscale interphase evaluation to predict composite properties显示文摘 | Edith Mader Shanglin Gao | 2001 | Journal of Adhesion Science and Technology2001，15，9： | 1 |
| 8 | Characterization of fiber/ matrix interface strength: Applicability of different tests, approaches and parameters 显示文摘 | ZhandarovSerge Mader Edith | 2005 | Composites Science and Technology2005，65，1： | 1 |
| 9 | Static and dynamic properties of single and multi - tlber/epoxy composites modified by sizings显示文摘 | Edith Mader Shang - lin Gao Rosemarie Plonka | 2007 | Composites Science and Technology2007，67，： | 1 |
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