Baibarac Mihaela, Stingescu Luiza, Stroe Malvina, Negrila Catalin, Matei Elena, Cotet Liviu C, Anghel Ion, Şofran Ioana E, Baia Lucian
National Institute of Materials Physics, Lab. Optical Processes in Nanostructured Materials, P.O. Box MG-7, R077125 Bucharest, Romania.
National Institute of Materials Physics, Nanoscale Condensed Matter Laboratory, P.O. Box MG-7, R077125 Bucharest, Romania.
Polymers (Basel). 2021 Feb 14;13(4):565. doi: 10.3390/polym13040565.
A new method to obtain poly(vinyl chloride) (PVC) spheres, which consists of an interaction between commercial PVC grains and hexyl ethyl cellulose and lauroyl peroxide at a temperature of 60 °C, is reported. The addition of the graphene oxide (GO) sheets dispersed in dimethylformamide to the reaction mixture leads to the generation of composites made of PVC spheres coated with GO sheets. Scanning electron microscopy studies have demonstrated that this method allows for the transformation of PVC grains with sizes between 75 and 227 μm into spheres with sizes varying from 0.7 to 3.5 μm when the GO concentration in the PVC/GO composite mass increases from 0.5 to 5 wt.%. Our studies of Raman scattering and FTIR spectroscopy highlight a series of changes that indicate the appearance of ClCH=CH-, CH=CCl-, and/or -CH=CCl- units as a result of PVC partial dehydrogenation. New -COO- and C-OH bonds on the GO sheet surfaces are induced during the preparation of PVC spheres coated with GO sheets. A photoluminescence (PL) band with a maximum at 325 nm is reported to characterize the PVC spheres. A PVC PL quenching process is demonstrated to be induced by the increase in the concentration of the GO sheets in the PVC/GO composite mass. The perspectives regarding the use of this composite as a flame-retardant material are also reported.
报道了一种获得聚氯乙烯（PVC）球体的新方法，该方法包括在60℃温度下，商业PVC颗粒与己基乙基纤维素和过氧化月桂酰之间的相互作用。向反应混合物中添加分散在二甲基甲酰胺中的氧化石墨烯（GO）片，会生成由涂覆有GO片的PVC球体组成的复合材料。扫描电子显微镜研究表明，当PVC/GO复合材料中GO的浓度从0.5 wt.%增加到5 wt.%时，该方法可将尺寸在75至227μm之间的PVC颗粒转变为尺寸在0.7至3.5μm之间的球体。我们对拉曼散射和傅里叶变换红外光谱的研究突出了一系列变化，这些变化表明由于PVC部分脱氢，出现了ClCH=CH-、CH=CCl-和/或-CH=CCl-单元。在制备涂覆有GO片的PVC球体过程中，GO片表面诱导产生了新的-COO-和C-OH键。据报道，以在325nm处出现最大值的光致发光（PL）带来表征PVC球体。结果表明，PVC/GO复合材料中GO片浓度的增加会引发PVC的PL猝灭过程。还报道了关于将这种复合材料用作阻燃材料的前景。
