Quiñones-Jurado Zoe Vineth, Waldo-Mendoza Miguel Ángel, Mata-Padilla José Manuel, González-Morones Pablo, Martínez-Colunga Juan Guillermo, Soriano-Corral Florentino, Cruz-Delgado Víctor Javier, Ziolo Ronald Francis, Avila-Orta Carlos Alberto
Innovación y Desarrollo en Materiales Avanzados A.C., Grupo POLYnnova, Carr. San Luis Potosí-Guadalajara 1510, Nivel 3, Local 12, Lomas del Tecnológico, San Luis Potosí S.L.P. C.P. 78211, Mexico.
CONACyT-Centro de Investigación en Química Aplicada, Blvd. Enrique Reyna H. 140, Col. San José de los Cerritos, Saltillo, Coahuila C.P. 25294, Mexico.
Polymers (Basel). 2018 Jan 9;10(1):55. doi: 10.3390/polym10010055.
Use of multi-wall carbon nanotubes (MWCNTs) in external layers (A-layers) of ABA-trilayer polypropylene films was investigated, with the purpose of determining intrinsic and extrinsic factors that could lead to antistatic behavior of transparent films. The incorporation of 0.01, 0.1, and 1 wt % of MWCTNs in the A-layers was done by dilution through the masterbatch method. Masterbatches were fabricated using isotactic polypropylene (iPP) with different melt flow indexes 2.5, 34, and 1200 g/10 min, and using different ultrasound assist methods. It was found that films containing MWCNTs show surface electrical resistivity of 10 and 10 Ω/sq, regardless of the iPP melt flow index (MFI) and masterbatch fabrication method. However, electrostatic charge was found to depend upon the iPP MFI, the ultrasound assist method and MWCNT concentration. A percolation electron transport mechanism was determined most likely responsible for this behavior. Optical properties for films containing MWCNTs do not show significant differences compared to the reference film at MWCNT concentrations below 0.1 wt %. However, an enhancement in brightness was observed, and it was attributed to ordered iPP molecules wrapping the MWCNTs. Bright transparent films with low electrostatic charge were obtained even for MWCNTs concentrations as low as 0.01 wt %.
研究了在ABA三层聚丙烯薄膜的外层（A层）中使用多壁碳纳米管（MWCNT），目的是确定可能导致透明薄膜产生抗静电行为的内在和外在因素。通过母粒法稀释，在A层中加入0.01%、0.1%和1%（重量）的MWCNT。使用不同熔体流动指数2.5、34和1200 g/10 min的等规聚丙烯（iPP）以及不同的超声辅助方法制备母粒。结果发现，无论iPP熔体流动指数（MFI）和母粒制备方法如何，含有MWCNT的薄膜的表面电阻率均为10和10 Ω/sq。然而，发现静电荷取决于iPP的MFI、超声辅助方法和MWCNT浓度。确定了一种渗流电子传输机制最有可能导致这种行为。在MWCNT浓度低于0.1%（重量）时，含有MWCNT的薄膜的光学性能与参考薄膜相比没有显著差异。然而，观察到亮度有所提高，这归因于有序的iPP分子包裹着MWCNT。即使MWCNT浓度低至0.01%（重量），也能获得具有低静电荷的明亮透明薄膜。
