改性玻璃纤维布增强落叶松复合材料的胶合性能

Characterization of bonding interface of modified glass-fiber/larch composites

通过界面改性来提高玻璃纤维(GF)/落叶松复合材料的胶合界面性能,从而提高纤维增强木质复合材料的综合性能。比较了等离子体、硅烷、单宁、硅烷/单宁复合4种方法改性玻璃纤维表面对GF/落叶松复合材料胶合性能以及力学性能的影响。结果表明:本试验条件下,单宁处理时间为2 h,硅烷处理质量分数为1%,等离子体处理时间为40 s时,GF/落叶松复合材料的胶合性能最佳,复合材料静曲强度和弹性模量均有所提高;单宁能够部分取代硅烷偶联剂改性玻璃纤维,增强玻璃纤维/间苯二酚胶黏剂之间的结合;比较4种方法处理效果可知,等离子体处理效果最佳,单宁/硅烷复合偶联剂效果次之,然后是硅烷和单宁单独处理。

This paper aimed at improving the glass fiber（ GF）/wood composite bonding performance by interface modifi- cation in order to enhance the performance of the composites. This study examined the bonding performance and mechan- ical properties of GF/wood composites with GF treated respeetively by tannin, atmospheric pressure plasma, silane and pine tannin/silane. The chemical composition and appearance of fiber surface were also discussed. The results showed that when GF was treated with tannin for 2 h, the dry shear strength and wet shear strength increased by 22. 93% and 1.59 times, respectively, and the MOR and MOE of GF/larch composite increased by 4. 9% and 15.9%, respectively. When GF was treated with 1% silane, the dry shear bonding strength and wet shear bonding strength increased by 25.48% and 1.6 times, respectively, and the MOR and MOE of GF/larch composite increased by 7. 8% and 5.8%, re- spectively. When GF was treated by atmospheric pressure plasma for 40 s, the dry shear bonding strength and wet shear bonding strength increased by 41% and 2.47 times, respectively, and the MOR and MOE of GF/larch composite in- creased by 21.3% and 23.7%, respectively. When GF was treated by tannin/silane, the dry shear bonding strength and wet shear bonding strength increased by 38% and 1.68 times, respectively, and the MOR and MOE of GF/larch compos- ite increased by 17.4% and 13. 8%, respectively. The results proved that tannin can partly substitute for silane in GF modification to be a coupling between GF and resorcinol. The comparison of the bonding performance and mechanical properties of GF/wood composite with GF treated in four methods showed that the atmospheric pressure plasma treatment was the best one, followed by the tannin/silane coupling, and silane and tannin treatements.