کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1251826 | 1495987 | 2014 | 7 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: Application of Raman spectroscopy to study of the polymer foams modified in the volume and on the surface by carbon nanotubes Application of Raman spectroscopy to study of the polymer foams modified in the volume and on the surface by carbon nanotubes](/preview/png/1251826.png)
Polylactide nanocomposites with multi-walled carbon nanotubes (PLA/MWCNT) in the form of porous foams made of a biocompatible, biodegradable and environmentally friendly polymer with a small amount of carbon nanotubes, were investigated in this work. Additionally, PLA/MWCNT porous nanocomposites were coated with MWCNTs using the electrophoretic deposition method (EPD). All samples were characterized by a porosity of about 90%, showing pore sizes in the range of 100 to 200 μm, for PLA/MWCNT foam, however, EPD deposition resulted in an decrease in the number of smaller pores in PLA/MWCNT + MWCNT (EPD) foam. The porous polymer (PLA) matrix, shows almost twofold increase in crystallinity while depth penetrating the volume of the sample. The crystallinity, of the PLA/MWCNT foam, at first is growing then it gradually lowers, while for the PLA/MWCNT + MWCNT(EPD) foam almost does not change. This behavior points toward significant distinction between surface and interior of the samples. A detailed analysis of Raman spectra indicates related carbon structures occurring in the nanomaterial foams: graphene and graphite phases, CNT and also carbon amorphous phases. The characteristics of a single-shell vibration are visible by the character of the G-band. The estimated crystallite size in PLA/MWCNT + MWCNT(EPD) is about 3 times smaller than that in the PLA/MWCNT.
Journal: Vibrational Spectroscopy - Volume 72, May 2014, Pages 50–56