Effect of surface modification of colloidal silica nanoparticles on the rigid amorphous fraction and mechanical properties of amorphous polyurethane–urea–silica nanocomposites,Journal of Polymer Science Part A: Polymer Chemistry

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Effect of surface modification of colloidal silica nanoparticles on the rigid amorphous fraction and mechanical properties of amorphous polyurethane–urea–silica nanocomposites
Journal of Polymer Science Part A: Polymer Chemistry Pub Date : 2019-11-18 , DOI: 10.1002/pola.29529
Oguzhan Oguz _{1,

2} , Nicolas Candau ₃ , Stéphane H. F. Bernhard ₃ , Cagla Kosak Soz ₄ , Ozge Heinz _{1,

2} , Grégory Stochlet ₅ , Christopher J. G. Plummer ₃ , Emel Yilgor ₄ , Iskender Yilgor ₄ , Yusuf Z. Menceloglu _{1,

2}

Affiliation

Colloidal silica nanoparticles (NPs) modified with eight different silane coupling agents were incorporated into an amorphous poly(tetramethylene oxide)-based polyurethane–urea copolymer matrix at a concentration of 10 wt % (4.4 vol %) in order to investigate the effect of their surface chemistry on the structure–property behavior of the resulting nanocomposites. The rigid amorphous fraction (RAF) of the nanocomposite matrix as determined by differential scanning calorimetry and dynamic mechanical analysis was confirmed to vary significantly with the surface chemistry of the NPs and to be strongly correlated with the bulk mechanical properties in simple tension. Hence, nanocomposites with an RAF of about 30 wt % showed a 120% increase in Young's modulus, a 25% increase in tensile strength, a 15% decrease in elongation at break with respect to the neat matrix, which had no detectable RAF, whereas nanocomposites with an RAF of less than 5% showed a 60% increase in Young's modulus, a 10% increase in tensile strength and a 5% decrease in the elongation at break. © 2019 Wiley Periodicals, Inc. J. Polym. Sci., Part A: Polym. Chem. 2019, 57, 2543–2556

中文翻译：

胶体二氧化硅纳米粒子表面改性对无定形聚氨酯-脲-二氧化硅纳米复合材料刚性无定形分数和力学性能的影响

将用八种不同硅烷偶联剂改性的胶态二氧化硅纳米粒子 (NPs) 以 10 wt% (4.4 vol%) 的浓度掺入无定形聚 (四亚甲基氧) 基聚氨酯-脲共聚物基质中，以研究它们的效果。表面化学对所得纳米复合材料的结构-性能行为。通过差示扫描量热法和动态力学分析确定的纳米复合材料基质的刚性无定形部分 (RAF) 与纳米颗粒的表面化学有显着差异，并且与简单张力下的整体机械性能密切相关。因此，RAF 约为 30 wt% 的纳米复合材料的杨氏模量增加了 120%，拉伸强度增加了 25%，相对于未检测到 RAF 的纯基质而言，断裂伸长率降低了 15%，而 RAF 小于 5% 的纳米复合材料的杨氏模量增加了 60%，拉伸强度增加了 10%，并且 5断裂伸长率降低％。© 2019 Wiley Periodicals, Inc. J. Polym。科学，A 部分：Polym。化学。2019 , 57 , 2543–2556

更新日期：2019-11-18

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