In recent year, the interest in environmentally friendly materials, like cellulose nanostructures (CNSs) has increased. Nanoscale dimensions, high surface area, low density, and high mechanical strength are examples of CNSs properties that attract researchers' attention. CNSs stability and dispersity are the main limitations that prevent its application as nanofiller in polymeric matrices. In this work, the surface modification of CNSs was investigated. To overcome CNSs limitation, they were modified with polyethylene glycol (PEG), in aqueous solution, in different proportions: 2, 5 and 10 wt%. FTIR, elemental analysis, NMR, and XPS were carried out to verify the adsorption efficiency. The results showed an excellent adsorption of PEG chains on the CNSs surface, with particle size increase of 50–90 nm and a considerable increase in thermal stability. XRD and AFM analysis observed no significant variation in crystallinity and morphology in modified CNSs. Thus, modification of CNSs with PEG is an environmentally friendly process and showed positive results regarding improving CNSs stability, in aqueous media.

近年来，人们对诸如纤维素纳米结构（CNSs）之类的环保材料的兴趣有所增加。纳米级尺寸，高表面积，低密度和高机械强度是CNSs特性的例子，吸引了研究人员的注意。CNS的稳定性和分散性是阻碍其在聚合物基质中用作纳米填料的主要限制。在这项工作中，对中枢神经系统的表面改性进行了研究。为了克服CNS的局限性，在水溶液中以2、5和10 wt％的不同比例对它们进行了聚乙二醇（PEG）的改性。进行了FTIR，元素分析，NMR和XPS以验证吸附效率。结果显示PEG链在CNS表面上的吸附极好，粒径增加50-90 nm，热稳定性大大提高。XRD和AFM分析发现，改性CNS的结晶度和形态无明显变化。因此，用PEG修饰CNS是一种环境友好的方法，并且在改善水性介质中CNS的稳定性方面显示出积极的结果。