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The effect of thermally developed SiC@SiO_2 core-shell structured nanoparticles on the mechanical, thermal and UV-shielding properties of polyimide composites

机译：热显影的SiC @ SiO_2核壳结构纳米粒子对聚酰亚胺复合材料的机械，热学和紫外线屏蔽性能的影响

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摘要

SiC@SiO2 core-shell nanostructured particles were successfully prepared via simple thermal treatment. The structure of the surfaces of pristine SiC and SiC@SiO2 core-shell nanostructured particles was investigated by X-ray diffraction spectroscopy (XRD). The formation of SiO2 shell on the SiC core was further evaluated by FTIR, SEM, XPS and TEM techniques. The nanostructured particles prepared were amino-modified by APTMS and incorporated in polyimide (PI) matrix to prepare highly flexible composite films. The mechanical, thermal, UV-shielding and water proof properties of the composites were investigated. The TGA results displayed that T-5 (5% weight loss temperature) and T-10 (10% weight loss temperature) were meaningfully enhanced up to 56.0 degrees C and 53.4 degrees C, respectively upon adding various amounts of modified SiC@SiO2 nanoparticles into the PI matrix. DSC results revealed that the glass transition temperature (T-g) was considerably enhanced up to 45.50 degrees C, up on the incorporation of different dosages of SiC@SiO2-NH2 nanoparticles in the matrix. The tensile results shown that introduction of the nanoparticles into the PI medium exhibited highly significant improvement in the tensile strength and the Young's modulus over 77.1% and 96.6% respectively as compared to the neat PI. The incorporation of SiC@SiO2-NH2 nanostructured particles in the matrix highly improved the hydrophobicity of the composites up to 62.55% as compared to the neat PI. The UV-shielding properties were also enhanced when functionalized SiC@SiO2-NH2 was added to the PI matrix. The dispersion of SiC@SiO2 in the PI matrix was investigated by Scanning electron microscope (SEM).
机译：通过简单的热处理成功地制备了SiC @ SiO2核壳纳米结构颗粒。通过X射线衍射光谱（XRD）研究了原始SiC和SiC @ SiO2核壳纳米结构颗粒的表面结构。通过FTIR，SEM，XPS和TEM技术进一步评估了SiC核上SiO2壳的形成。制备的纳米结构颗粒通过APTMS进行氨基改性，并掺入聚酰亚胺（PI）基质中以制备高柔性复合膜。研究了复合材料的机械，热，紫外线屏蔽和防水性能。 TGA结果表明，通过添加各种量的改性SiC @ SiO2纳米粒子，T-5（失重5％的温度）和T-10（失重10％的温度）分别显着提高了56.0摄氏度和53.4摄氏度。进入PI矩阵。 DSC结果表明，在基质中掺入不同剂量的SiC @ SiO2-NH2纳米颗粒后，玻璃化转变温度（T-g）显着提高至45.50摄氏度。拉伸结果表明，与纯PI相比，将纳米颗粒引入PI介质的拉伸强度和杨氏模量分别显着提高了77.1％和96.6％。与纯净的PI相比，在基体中掺入SiC @ SiO2-NH2纳米结构粒子可极大地提高复合材料的疏水性，最高可达62.55％。当将功能化的SiC @ SiO2-NH2添加到PI基质中时，紫外线防护性能也得到增强。用扫描电子显微镜（SEM）研究了SiC @ SiO2在PI基体中的分散性。

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  • 来源
    《Composites》 |2019年第15期|106917.1-106917.12|共12页
  • 作者

    Mekuria Tadele Daniel; Zhang Chunhong; Fouad Diaa Eldin;

  • 作者单位

    Harbin Engn Univ Polymer Mat Res Ctr Key Lab Superlight Mat & Surface Technol Minist Educ Coll Mat Sci & Chem Engn Harbin 150001 Heilongjiang Peoples R China|Assosa Univ Chem Dept Coll Nat & Computat Sci Assosa Ethiopia;

    Harbin Engn Univ Polymer Mat Res Ctr Key Lab Superlight Mat & Surface Technol Minist Educ Coll Mat Sci & Chem Engn Harbin 150001 Heilongjiang Peoples R China;

    Harbin Engn Univ Polymer Mat Res Ctr Key Lab Superlight Mat & Surface Technol Minist Educ Coll Mat Sci & Chem Engn Harbin 150001 Heilongjiang Peoples R China|Forens Author Minist Justice Cairo Egypt;

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  • 正文语种 eng
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  • 关键词

    Silicon carbide (SiC); Core-shell nanostructures; Polyimide composite films; Mechanical performance; Thermal properties; UV-Shielding behavior;

    机译：碳化硅（SiC）;核-壳纳米结构;聚酰亚胺复合膜;机械性能;热性能;防紫外线行为;

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