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首页> 外文期刊>RSC Advances >Highly strong and highly tough electrospun polyimide/polyimide composite nanofibers from binary blend of polyamic acids
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Highly strong and highly tough electrospun polyimide/polyimide composite nanofibers from binary blend of polyamic acids

机译：由聚酰胺酸的二元共混物制成的高强度和高韧性的电纺聚酰亚胺/聚酰亚胺复合纳米纤维

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Electrospun blend-polyimide (blend-PI) nanofibers with high tensile strength and toughness are highlighted in this article. The blend-PI nanofibers were prepared by electrospinning the binary blend of rigid and flexible polyamic acids, followed by thermal imidization. The method is simple and can be extended to other kinds of polyamic acids. The morphologies and structures of the blend-PI nanofibers were investigated by scanning electron microscopy (SEM) and wide-angle X-ray diffraction (XRD). The mechanical properties, thermal properties and miscibility of the blend-PI nanofibers were studied by a tensile test, thermogravimetric analysis (TGA) and dynamic mechanical analysis (DMA). The mechanical properties of the blend-PI nanofibers, including tensile strength, modulus, elongation at break and toughness, could be well-tuned by modifying the molar ratio of the rigid component (B-PI) and the flexible component (O-PI). The blend-PI nanofibers with B-PI/O-PI molar ratio of 4/6 had an ultra-high strength of 1.3 GPa with an excellent toughness of 82 J g(-1). All the blend-PI nanofibers showed thermal stability to above 500 degrees C. The presence of only one glass transition temperature (T-g) suggested the good miscibility of the binary PIs in the blend-PI nanofibers. This study would provide completely new opportunities for modifying the properties of electrospun PI nanofibers.
机译：本文着重介绍了具有高拉伸强度和韧性的电纺共混聚酰亚胺（blend-PI）纳米纤维。共混物-PI纳米纤维是通过电纺刚性和柔性聚酰胺酸的二元共混物，然后进行热酰亚胺化制备的。该方法简单，可以扩展到其他种类的聚酰胺酸。通过扫描电子显微镜（SEM）和广角X射线衍射（XRD）研究了共混PI纳米纤维的形貌和结构。通过拉伸试验，热重分析（TGA）和动态力学分析（DMA）研究了共混PI纳米纤维的机械性能，热性能和可混溶性。共混物-PI纳米纤维的机械性能，包括抗张强度，模量，断裂伸长率和韧性，可以通过改变刚性组分（B-PI）和柔性组分（O-PI）的摩尔比来很好地调节。 B-PI / O-PI摩尔比为4/6的共混PI纳米纤维具有1.3 GPa的超高强度，具有82 J g（-1）的优异韧性。所有的共混物PI纳米纤维都显示出超过500摄氏度的热稳定性。仅存在一个玻璃化转变温度（T-g），表明二元PIs在共混物PI纳米纤维中具有良好的混溶性。这项研究将为改变电纺PI纳米纤维的性能提供全新的机会。

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