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首页> 外文期刊>Journal of Applied Polymer Science >Effect of multiwalled carbon nanotubes on crystallization behavior of poly(vinylidene fluoride) in different solvents
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Effect of multiwalled carbon nanotubes on crystallization behavior of poly(vinylidene fluoride) in different solvents

机译：碳纳米管对不同溶剂中聚偏二氟乙烯结晶行为的影响

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摘要

In this study, the poly(vinylidene fluoride) (PVDF)-multiwalled carbon nanotubes (MWNTs) composites have been prepared by solution casting in two different solvents: dimethyl sulfoxide (DMSO) and dimethylacetamide (DMAc). Fourier transform infrared spectroscopy (FTIR) and differential scanning calorimeter (DSC) results showed that the crystal phases of PVDF are quite different in the two solvents. When DMSO is used as the solvent, the PVDF crystalline phases could be greatly alternated from α-form to β-form by the incorporation of MWNTs. While the crystalline structure of PVDF hardly change in the case of DMAc. The DSC and polarized optical microphotographs implied that MWNTs not only act as nucleating agents for PVDF but also confine the crystallization of PVDF. Besides, it was found that the storage modulus (E') of the composites were significantly enhanced with an appropriate content of MWNTs. And when using DMSO as the solvent, one relaxation process emerges in the loss tan δ (loss factor) curves of the neat PVDF and PVDF/MWNTs composites, while it was not observed in the DMAc system. The obtained results revealed that varing solvents have different effects on the crystallization behavior of PVDF with the addition of MWNTs.
机译：在这项研究中，聚偏二氟乙烯（PVDF）-多壁碳纳米管（MWNT）复合材料是通过在两种不同的溶剂：二甲基亚砜（DMSO）和二甲基乙酰胺（DMAc）中进行溶液浇铸而制备的。傅立叶变换红外光谱（FTIR）和差示扫描量热仪（DSC）结果表明，两种溶剂中PVDF的晶相差异很大。当使用DMSO作为溶剂时，通过引入MWNT，PVDF晶相可以从α形式极大地转变为β形式。在DMAc的情况下，PVDF的晶体结构几乎不变。 DSC和偏振光学显微照片暗示MWNTs不仅充当PVDF的成核剂，而且限制PVDF的结晶。此外，发现适当含量的MWNTs可以显着提高复合材料的储能模量（E'）。当使用DMSO作为溶剂时，纯PVDF和PVDF / MWNTs复合材料的损耗tanδ曲线出现了一个松弛过程，而在DMAc系统中却没有观察到。所得结果表明，添加MWNTs后，varing溶剂对PVDF的结晶行为具有不同的影响。

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