Chain Dynamics of Ultrahigh Molecular Weight Polyethylene Composites with Graphene Oxide Nanosheets.

Chain Dynamics of Ultrahigh Molecular Weight Polyethylene Composites with Graphene Oxide Nanosheets.
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超高分子量聚乙烯与氧化石墨烯纳米片复合材料的链动力学。

DOI:
10.1021/acsmacrolett.1c00007
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发表时间:
2021
期刊:
影响因子:
7.015
通讯作者:
Martin-Fabiani I
Martin-Fabiani I
中科院分区:
化学1区
文献类型:
--
作者:
Martin-Fabiani I

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我们通过中子自旋回波光谱研究了超高分子量聚乙烯(UHMWPE)及其与氧化石墨烯(GO)纳米片复合材料的熔体链动力学。对于探索的 GO 浓度,我们观察到纯 UHMWPE 的受阻链动力学。我们提出了一种模型,其中一部分聚合物固定在 GO 片的顶部和底部。该模型使我们能够对吸附和游离聚合物分数以及吸附层的厚度进行显微测量。我们的实验提供了 GO 阻碍聚合物熔体中缠结形成的实验纳米证据,这种现象之前通过流变测量在宏观尺度上观察到。
We investigate the melt chain dynamics of ultrahigh molecular weight polyethylene (UHMWPE) and its composites with graphene oxide (GO) nanosheets by means of neutron spin echo spectroscopy. For the GO concentrations explored, we observe hindered chain dynamics with respect to the pure UHMWPE. We propose a model where a fraction of the polymer is immobilized on top and at the bottom of GO sheets. This model enables us to provide a microscopic measurement of the adsorbed and free polymer fractions, as well as the thickness of the adsorbed layer. Our experiments provide experimental nanoscopic evidence of GO hindering entanglement formation in a polymer melt, a phenomenon that had been observed at the macroscale before via rheological measurements.
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DOI: --
发表时间: 2014
期刊:
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