材料科学
硅烷
复合材料
纳米复合材料
聚合物
二氧化硅
极限抗拉强度
固化(化学)
环氧树脂
纳米颗粒
抗弯强度
玻璃纤维
热稳定性
涂层
化学工程
纳米技术
工程类
标识
DOI:10.1177/00219983221108531
摘要
Silicon dioxide (SiO 2 ) nanoparticles can be used as reinforcing material for composites due to their favorable characteristics. However, they are commonly subjected to surface treatments with silane coupling agents to achieve fine dispersibility and better mechanical interlocking at interface. In this study, the silane-coated SiO 2 nanoparticles (as received) were used as secondary reinforcement without applying additional silane treatment process. KH550 and KH570 silane-coated SiO 2 nanoparticles were dispersed, respectively, into polymer matrix, and then the modified matrix was reinforced with glass fibers. Silanized SiO 2 filled glass fiber reinforced polymer (GFRP) nanocomposites were investigated for physical, mechanical, morphological, and thermal properties. Depending on the nanoparticles' ratio and silane coating, the increments were obtained till 10% for tensile strength, between 18.40% and 75.26% for flexural strength, and till 81% for impact strength. SEM confirmed that the enhancements could be attributed to the improved interfacial adhesion between the modified matrix and fiber reinforcements. The void contents within the polymer nanocomposites decreased by 38%–54% compared to a pure one. DSC and TGA examinations revealed that silanized SiO 2 nanoparticles provided a better curing behavior (10% increase in T g for 3 wt.% KH550-SiO 2 ) and improved thermal stability for the GFRP composites (increase in T end values by 50–70°C). Generally, KH550 silane-coated SiO 2 has provided enhanced interface strengthening, leading to better characteristics for GFRP composites since the amino functional groups contained in KH550 have more favorable integration with epoxy matrix.
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