Preparation and properties of electrospun GO/PEO nanofibers
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摘要: 在聚氧化乙烯（PEO）电纺纤维中添加氧化石墨烯（GO），提高电纺PEO纤维的分子链取向度，从而增加纤维的热导率。讨论了氧化石墨烯的引入影响PEO分子链取向度的机理。通过偏振红外光谱和T型法测纤维热导率，验证了当分子链取向度最高时，PEO电纺纤维的热导率最高，达到22.9 W/m·K，与块体高分子相比，热导率提升了两个数量级。Abstract: Bulk polymers have a very low thermal conductivity of about 0.2 W/m·K. Polymer nanofibers prepared by electrospinning have a much higher thermal conductivity along the fiber axis. Graphene oxide (GO) was dispersed in a polyethylene oxide (PEO) solution and the resulting dispersion was electrospun into GO/PEO nanofibers. The fiber with 0.5 wt% GO had a thermal conductivity of 22.9 W/m·K, which is two-orders of magnitude higher than bulk PEO. Polarized FT-IR shows that the PEO fibers had different spectra in directions parallel and perpendicular to polarized IR. The intensity ratio of the peak at 1 099 cm-1 between the parallel and perpendicular directions to the polarized IR was calculated. The curves of thermal conductivity and the intensity ratio against GO content are very similar, which suggests that molecular alignment is a key factor determining the thermal conductivity of the nanofibers. GO at low contents inhibits the movement of PEO chains because hydrogen bonds are formed between GO and a PEO chain during electrospinning and this improves the orientation degree of the PEO chain in the resulting GO/PEO nanofibers. With increasing GO content, the viscosity of the solution increases, which is unfavorable for the alignment of the PEO chain during electrospinning.
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Key words:
- Polyethylene oxide /
- Electrospinning /
- Graphene oxide /
- Molecular alignment /
- Thermal conductivity
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