SciELO - Scientific Electronic Library Online

vol.20 issue4Polyamide 6/organoclay nanocomposites: evaluation of thermal behavior of injection molded samples by DSCStudy of the reprocessing of low density polyethylene (LDPE) recycled from extruded blown films author indexsubject indexarticles search
Home Pagealphabetic serial listing  

Services on Demand




Related links



Print version ISSN 0104-1428


TEIXEIRA, Eliangela de M. et al. Cotton nanofibers obtained by different hydrolytic acid conditions. Polímeros [online]. 2010, vol.20, n.4, pp.264-268.  Epub Nov 12, 2010. ISSN 0104-1428.

The thermal stability of cellulose nanofibers is related to their application and especially to polymer processing normally occurring at ca. 200 °C. In this work, nanofibers of commercial cotton were obtained by acid hydrolysis employing different acids: sulfuric, hydrochloric and a mixture (1:1; sulfuric acid: hydrochloric acid).The morphology of the nanofibers were characterized by transmission microscopy (TEM), zeta potential, elemental analysis, crystallinity by X ray diffraction (XRD) and thermal stability (TGA) in air atmosphere by thermogravimetric analysis. The results indicated a very similar morphology and crystallinity among them. The main differences were lie in the aggregation state and thermal stability. The aggregation state of the suspensions decreases in the order HCl < H2SO4:HCl < H2SO4 due to the increase in surface charge as determined by zeta potential measurements. The hydrolysis with a mixture of HCl and H2SO4 resulted in cellulose nanofibers with higher thermal stability than those hydrolyzed with H2SO4. The hydrolysis employed with a mixture of sulphuric and hydrochloric acids also showed a better dispersion than those suspensions of nanofibers obtained by hydrolysis with only HCl.

Keywords : Cotton; cellulose nanofiber; acid hydrolysis.

        · abstract in Portuguese     · text in Portuguese     · Portuguese ( pdf epdf )


Creative Commons License All the contents of this journal, except where otherwise noted, is licensed under a Creative Commons Attribution License