小角中子散射研究碳同素异形体纳米填料在等规聚丙烯复合材料中的空间结构和聚集
Spatial structure and aggregation of carbon allotrope nanofillers in isotactic polypropylene composites studied by small-angle neutron scattering
摘要：
我们用中子小角散射法研究了碳同素异形体纳米填料在等规聚丙烯基体中的聚集行为。利用ATSAS软件对实验数据进行了分析，确定了在散射角范围内纳米填料在聚丙烯本体中聚集的分形形状、维数和尺寸。我们估计了不同类型的碳纳米填料在不同浓度下的体积分布和聚集：纳米石墨，石墨烯纳米片（GNP），单壁碳纳米管（SWCNT），多壁碳纳米管（MWCNT），二元填料MWCNT/GNP和富勒烯。我们重建了所有纳米填料的纳米级聚集体的形状，发现该系统是多分散的;纳米填料在iPP体积中作为分形致密聚集体与凹凸不平的表面相关联，其尺寸超过纳米填料的原始尺寸数倍。
英文摘要：
We study the aggregation of carbon allotrope nanofillers in the matrix of isotactic polypropylene with direct small-angle neutron scattering measurements. With the ATSAS software, we analyzed the data and determined the fractal shape, dimension, and sizes of nanofiller aggregation in the bulk of isotactic polypropylene over the range of the scattering angles. We estimated the volume distributions and aggregation of different types of carbon nanofillers at different concentrations: nanographite, graphene nanoplatelets (GNP), single-walled carbon nanotubes (SWCNT), multi-wall carbon nanotubes (MWCNT), binary fillers MWCNT/GNP and fullerenes. We reconstructed the shape of nanoscale aggregates of all nanofillers and found that the systems are polydisperse; nanofillers associate in the volume of iPP as fractal dense aggregates with rugged surface, their sizes exceeding original dimensions of nanofillers several times.
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