Shear alignment of fullerenes in nanotubular supramolecular complexes

Shear alignment of fullerenes in nanotubular supramolecular complexes
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纳米管超分子复合物中富勒烯的剪切排列

DOI:
10.1016/j.polymer.2014.11.058
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发表时间:
2015
期刊:
影响因子:
4.6
通讯作者:
Kincer M
Kincer M
中科院分区:
化学2区
文献类型:
--
作者:
Kincer M

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采用高温静电纺丝的方法,将C60和C70超分子络合物包裹在间规聚甲基丙烯酸甲酯(S-PMMA)螺旋超结构形成的空腔内。利用13C固体核磁共振仪,C60被包裹在纳米管腔中,通过下场化学位移和显著缩短的自旋-自旋弛豫时间,与物理上与S-聚甲基丙烯酸甲酯物理混合的C60相比。热分析表明,C60/S-聚甲基丙烯酸甲酯电纺纤维在180℃有熔融吸热,这与纳米管状超分子络合物的形成一致。根据S-聚甲基丙烯酸甲酯的间规含量和重量法测定的电纺纤维中的富勒烯含量,82%的纳米腔填充了C60,下降到55%填充了C70。通过静电纺丝将纤维宏观地排列在分离式收集板上,以分析分子排列。广角X射线散射方位角扫描显示,C60/S-PMMA纳米棒具有高度的分子水平排列,有序参数为0.7。
Supramolecular complexes of C60and C70encapsulated within the cavity created by the helical superstructure of syndiotactic poly(methyl methacrylate) (s-PMMA) were aligned by elevated-temperature electrospinning. Using13C solid-state NMR, encapsulation of C60within the nanotubular cavity was confirmed by downfield chemical shifts and significantly shorter spin–spin relaxation times compared to C60physically mixed with s-PMMA. Thermal analysis revealed a melting endotherm at 180 °C for the C60/s-PMMA electrospun fibers that is consistent with formation of the nanotubular supramolecular complex. Based on the syndiotactic content of the s-PMMA and the gravimetrically determined fullerene content in the electrospun fibers, 82% of the nanocavity is filled with C60,dropping to 55% filling with C70. The fibers were macroscopically aligned by electrospinning onto a split collector plate for analysis of molecular alignment. Wide-angle X-ray scattering azimuthal scans revealed high degrees of molecular-level alignment, with an order parameter of 0.70 for the C60/s-PMMA nanopods.
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影响因子: 1
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