PDF(Pubmed)
Abstract：
In recent years, conductive polymer nanocomposites have gained significant attention due to their promising thermoresistive and Joule heating properties across a range of versatile applications, such as heating elements, smart materials, and thermistors. This paper presents an investigation of semi-crystalline polyvinylidene fluoride (PVDF) nanocomposites with 6 wt.% carbon-based nanofillers, namely graphene nanoplatelets (GNPs), multi-walled carbon nanotubes (MWCNTs), and a combination of GNPs and MWCNTs (hybrid). The influence of the mono- and hybrid fillers on the crystalline structure was analyzed by X-ray diffraction (XRD) and differential scanning calorimetry (DSC). It was found that the nanocomposites had increased amorphous fraction compared to the neat PVDF. Furthermore, nanocomposites enhanced the β phase of the PVDF by up to 12% mainly due to the presence of MWCNTs. The resistive properties of the nanocompositions were weakly affected by the temperature in the analyzed temperature range of 25-100 °C; nevertheless, the hybrid filler composites were proven to be more sensitive than the monofiller ones. The Joule heating effect was observed when 8 and 10 V were applied, and the compositions reached a self-regulating effect at around 100-150 s. In general, the inclusion in PVDF of nanofillers such as GNPs and MWCNTs, and especially their hybrid combinations, may be successfully used for tuning the self-regulated Joule heating properties of the nanocomposites.
摘要：
近年来,导电聚合物纳米复合材料已经获得了显著的关注，由于他们的有前途的热阻和焦耳加热性能，在一系列的通用应用，如加热元件，智能材料,和热敏电阻。本文介绍了具有6wt。的半结晶聚偏二氟乙烯（PVDF）纳米复合材料的研究。%碳基纳米填料，即石墨烯纳米片（GNPs），多壁碳纳米管(MWCNT),以及GNP和MWCNT的组合(杂化)。通过X射线衍射（XRD）和差示扫描量热法（DSC）分析了单填料和杂化填料对晶体结构的影响。发现与纯PVDF相比,纳米复合材料具有增加的无定形分数。此外，纳米复合材料将PVDF的β相提高了12％，主要是由于MWCNT的存在。在25-100°C的分析温度范围内，纳米组合物的电阻特性受温度的影响很小；尽管如此，混合填料复合材料被证明比单一填料更敏感。当施加8和10V时，观察到焦耳加热效应，并且组合物在100-150s左右达到自我调节效果。通常，在PVDF中包含纳米填料，如GNP和MWCNT，尤其是它们的混合组合，可以成功地用于调节纳米复合材料的自调节焦耳加热性能。
