Two kinds of different oxygen-containing polar polymers, poly(vinyl alcohol) (PVA) and poly(ethylene glycol) (PEG), were chosen as modifiers to decorate multiwall carbon nanotubes (MWNTs) by a physical noncovalent method. The purpose of this article was to research the polymer polarity influencing the enhanced absorbing performance of MWNTs. Cole–Cole semicircle model was used to simulate the effects of polarization of PVA and PEG on MWNTs. Whereas the surface morphological structure of hybrids was observed via transmission electron microscope, the molecular structure of the hybrids were analyzed by Raman spectroscopy and Fourier transform infrared spectroscopy. For the PVA/MWNTs and PEG/MWNTs hybrids, the results of the reflection loss (RL) indicated that both of them had a better microwave absorption property. The maximum RL of PVA/MWNTs was −30.62 dB at 10.96 GHz and the bandwidth below −10 dB was 2.32 GHz (10.08–12.40 GHz), whereas the maximum RL of PEG/MWNTs was −25.17 dB at 10.16 GHz and the bandwidth below −10 dB was 1.84 GHz (9.28–11.12 GHz). The maximum RL of the PVA/MWNTs absorbent was higher than that of PEG/MWNTs absorbent. The results showed that the polymers with different polarity had noteworthy effects on the absorbing property of MWNTs.
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Li et al. (2018) studied this question.
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