关键词: 高强玻璃纤维;耐酸性能;结构分析;侵蚀机理

Abstract: High Strength glasses fibers with different compositions were prepared by conventional melting method. The relationship between the composition and acid resistance properties was researched. The variation of glass fibers in surface and structure was investigated using scanning electron microscope (SEM),infrared spectrometer (IR),nuclear magnetic resonance (NMR)before and after acid etching. The IR and NMR results indicate that the glass network structure is mainly consisted of [SiO4 ] tetrahedron and [AlO4 ]tetrahedron. After acid etching the silicon-oxygen bond (Si-O-Si)and the aluminum-oxygen bond (Al-O)in network structure would be broken. The Si-O-Si bond reacted to form Si-OH bond and finally attached to the fiber surface by transforming into silica gel,while the Al3+ would be replaced by hydrogen ion (H+)from solution so that the concentration of Al3+ in glass network is reduced. The relevance between composition and acid resistance properties shows that the slightly increasing of glass network former and high field strength modifier ion will strengthen the glass network and improve the acid resistance properties. High degree of polymerization will make migration of ions difficult and restrain the replacement reaction. Besides,stronger bond between high field strength ion Ti4+ and the anions groups corresponds to higher degree of polymerization,and better acid resistance properties.

Key words: high strength glass fibers;acid resistance property;structure analysis;corrosion mechanism