异丙基三（磷酸二辛酯）钛酸酯偶联剂改性的纳米二氧化硅的特征与形貌,Journal of Nanoscience and Nanotechnology

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异丙基三（磷酸二辛酯）钛酸酯偶联剂改性的纳米二氧化硅的特征与形貌
Journal of Nanoscience and Nanotechnology Pub Date : 2018-05-01 , DOI: 10.1166/jnn.2018.14854
Ho Ngoc Minh ₁ , Nguyen Thuy Chinh ₂ , Tran Thi Thanh Van ₂ , Dam Xuan Thang ₃ , Thai Hoang ₂

Affiliation

为了提高纳米二氧化硅在聚合物基质中的分散性，需要对纳米二氧化硅进行表面有机改性。这项工作揭示了在甲苯溶剂中被钛酸酯偶联剂异丙基三（磷酸二辛酯）钛酸酯（KR12）改性的二氧化硅纳米颗粒。通过热重分析（TGA）研究了反应温度，反应时间和反应物配比对接枝效率的影响。获得的结果表明，随着KR-12含量从5％增至15％（重量），而纳米级二氧化硅表面上的钛酸酯偶联剂KR-12的接枝百分比从4.97％迅速增加至13.11 wt。％，而从13.21％缓慢提高至13.43％。 KR-12的含量分别为30-45重量％。KR-12含量和接枝反应时间对接枝效率有显着影响，而接枝反应温度对接枝效率负相关。红外光谱和能量色散X射线光谱法（EDS）的分析结果表明，钛酸酯偶联剂KR-12已共价键合到纳米二氧化硅的表面。透射电子显微镜（TEM）图像和尺寸分布表明，有机改性后，纳米二氧化硅颗粒的平均粒径约为86 nm，纳米颗粒的团聚明显减少。所得结果表明，用钛酸酯偶联剂KR-12对纳米二氧化硅进行了表面处理是成功的。红外光谱和能量色散X射线光谱法（EDS）的分析结果表明，钛酸酯偶联剂KR-12已共价键合到纳米二氧化硅的表面。透射电子显微镜（TEM）图像和尺寸分布表明，有机改性后，纳米二氧化硅颗粒的平均粒径约为86 nm，纳米颗粒的团聚明显减少。所得结果表明，用钛酸酯偶联剂KR-12对纳米二氧化硅进行了表面处理是成功的。红外光谱和能量色散X射线光谱法（EDS）的分析结果表明，钛酸酯偶联剂KR-12已共价键合到纳米二氧化硅的表面。透射电子显微镜（TEM）图像和尺寸分布表明，有机改性后，纳米二氧化硅颗粒的平均粒径约为86 nm，纳米颗粒的团聚明显减少。所得结果表明，用钛酸酯偶联剂KR-12对纳米二氧化硅进行了表面处理是成功的。纳米二氧化硅颗粒的平均粒径约为86 nm，纳米颗粒的团聚显着减少。所得结果表明，用钛酸酯偶联剂KR-12对纳米二氧化硅进行了表面处理是成功的。纳米二氧化硅颗粒的平均粒径约为86 nm，纳米颗粒的团聚显着减少。所得结果表明，用钛酸酯偶联剂KR-12对纳米二氧化硅进行了表面处理是成功的。

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Characteristics and Morphology of Nanosilica Modified with Isopropyl Tri(dioctyl Phosphate) Titanate Coupling Agent

In order to improve dispersiveness of nanosilica in polymer matrix, surface organo-modification of nanosilica is necessary. This work reveals silica nanoparticles modified by titanate coupling agent isopropyltri (dioctylphosphate) titanate (KR12) in toluene solvent. Effect of reaction temperature, reaction time and reactant ratio on grafting efficiency have been studied by Thermogravimetric Analysis (TGA). The obtained results exhibit the grafted percentage of titanate coupling agent KR-12 on the surface of nanosilica increased quickly from 4.97 to 13.11 wt.% as increasing the content of KR-12 from 5 to 15 wt.% and raise slower from 13.21 to 13.43 wt.% as content of KR-12 in the range of 30 to 45 wt.%, respectively. The KR-12 content and grafting reaction time affect significantly on the grafting efficiency while temperature of grafting reaction is negative to the grafting efficiency. The results of analysis related to Infrared Spectroscopy and Energy-Dispersive X-ray spectroscopy (EDS) displayed titanate coupling agent KR-12 have been covalently bonded to surface of the nanosilica. The Transmission Electron Microscopy (TEM) images and size distribution indicated that after organic modification, nanosilica particles had average size about 86 nm and the agglomeration of nanoparticles decreased significantly. The obtained results showed that surface treatment of nanosilica with titanate coupling agent KR-12 was successful.

更新日期：2018-05-01

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