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车用制品技术与应用 豆高雅·汽车用碳纳米管 / 聚乳酸复合材料结晶性能研究

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Research on the crystallization properties of carbon nanotubes/
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Dou Gaoya
(Yulin New Science and Technology Development Co. LTD. , Yulin 718100, Shaanxi, China)

Abstract: In this paper, PLA/CNT composites with different ratios were prepared by solution evaporation
method. The microscopic morphology of CNTs in PLA was investigated by scanning electron microscopy
(SEM), and it was found that CNTs had better dispersion in the PLA matrix. The effects of CNT addition on the
crystallization, crystal structure and mechanical properties of PLA were investigated by differential scanning
calorimetry (DSC), X-ray diffraction (XRD) and universal testing machine. It was found that the addition
of CNTs improved the crystallization rate, crystallinity and mechanical properties of PLA. The dispersion of
CNTs in the matrix directly affects the properties of PLA. In order to better disperse CNTs in the PLA matrix,
nanocomposites with different contents of CNTs were prepared by solution precipitation method. The results
of SEM and XRD show that the solution precipitation method can effectively inhibit the agglomeration of CNTs
and achieve better dispersion effect compared with the solution evaporation method. At the same time, the
crystal structure, crystalline properties and mechanical properties were studied. It was found that the addition
of CNTs not only improved the crystallinity of PLA, but also changed the crystal structure and promoted the
transformation of PLA to α crystal form. With the increase of CNT content, the crystallinity of PLA decreased,

2022 第 48 卷 ·33·
年