论文部分内容阅读
针对纤维增强塑料排烟筒工程应用中采用的玻璃纤维/溴化环氧乙烯基酯(GF/VE)复合材料和碳纤维-玻璃纤维/溴化环氧乙烯基酯(CF-GF/VE)复合材料分别进行混酸介质(H2SO4、HF、HCl和HNO3混合溶液)加速腐蚀试验,考察了3种温度下(25℃、55℃、80℃)的混酸介质浸泡后GF/VE与CF-GF/VE复合材料的质量及弯曲性能变化,并结合动态热力学性能、微观结构等分析了材料的性能衰减机制。结果表明:相同浸泡条件下,试样GF/VE的质量增重率高于CF-GF/VE,酸性介质在GF/VE和CF-GF/VE内部的扩散活化能分别为8.798kJ·mol-1和10.959kJ·mol-1;80℃浸泡2 160h后,CF-GF/VE复合材料的弯曲强度保留率为75.29%,而GF/VE的弯曲强度保留率仅为58.84%;DMA研究结果表明:常温条件下的腐蚀浸泡对材料的玻璃化转变温度Tg影响较小,加温条件下试样的Tg显著降低;SEM研究发现:混酸介质浸泡后,试样表面出现许多孔洞,同时纤维/基体界面发生了明显的脱粘破坏。
Aiming at the applications of glass fiber / brominated epoxy vinyl ester (GF / VE) composites and carbon fiber-glass fiber / brominated epoxy vinyl ester (CF-GF / VE) composites used in engineering applications of fiber- Accelerated corrosion tests were carried out on the mixed acid medium (mixed solution of H2SO4, HF, HCl and HNO3) respectively. The effects of GF / VE and CF-GF / VE composite after soaking in mixed acid media at three temperatures (25 ℃, 55 ℃, 80 ℃) Material quality and bending performance changes, combined with dynamic thermodynamic properties, microstructure and other analysis of the material performance degradation mechanism. The results show that under the same immersion conditions, the mass gain of GF / VE is higher than that of CF-GF / VE, and the diffusion activation energies of GF / VE and CF-GF / VE are 8.798kJ · mol- 1 and 10.959 kJ · mol-1, respectively. The flexural strength retention rate of CF-GF / VE composites was 75.29% after 2 160 h immersion at 80 ℃, while the flexural strength retention of GF / VE was only 58.84% : Under normal temperature, the corrosion immersion has a little effect on the glass transition temperature (Tg) of the material, and the Tg of the sample decreases significantly under heating. The SEM results show that many holes appear on the surface of the sample after soaking in mixed acid medium, The interface occurred obvious debonding damage.