UCL Eastman Dental Institute , 256 Grays Inn Road , London WC1X 8LD , U.K.
Department of Biological Sciences , Birkbeck College , Malet Street, Bloomsbury , London WC1E 7HX , U.K.
ACS Appl Mater Interfaces. 2018 Oct 3;10(39):33652-33661. doi: 10.1021/acsami.8b10727. Epub 2018 Sep 18.
Recent developments in paper and canvas conservation have seen the introduction of nanocellulose (NC) as a compatible treatment for the consolidation of historical cellulosic artifacts and manuscripts. However, as part of the assessment of these new materials for canvas consolidation, the adhesion of the consolidation treatment (which takes place between the applied material and the substrate) has not yet been evaluated, and as a result, it is poorly understood by both the scientific and conservation communities. After evaluating the potential of NC treatments for the consolidation of cotton painting canvas, we investigate a route to promote the interaction between the existing canvas and the nanocellulose treatment, which is in our case made of cellulose nanofibrils (CNF). This was carried out by introducing a cationic polymer, polyamidoamine-epichlorohydrin (PAAE), as an intermediate layer between the canvas and the CNF. The morphological, chemical, and mechanical evaluation of the canvas samples at different relative humidity (RH) levels demonstrated how the adhesion of the added PAAE layer is a dominant factor in the consolidation process. Improvement in the coating of canvas single fibers by the CNF, higher adhesion energy between the canvas fibers and the CNF treatment, and finally overall stronger canvas reinforcement were observed following the introduction of PAAE. However, an increase in mechanical response to moisture sorption and desorption was also observed for the PAAE-treated canvases. Overall, this study shows the complexity of such systems and, as such, the relevance of using a multiscale approach for their assessment.
最近在纸张和画布保护方面的发展见证了纳米纤维素（NC）的引入，作为一种用于巩固历史纤维素制品和手稿的相容处理方法。然而，作为对这些用于画布加固新材料的评估的一部分，加固处理的附着力（发生在施加的材料和基底之间）尚未得到评估，因此，科学界和保护界都对此了解甚少。在评估 NC 处理方法对棉画布加固的潜力之后，我们研究了一种促进现有画布与纳米纤维素处理之间相互作用的方法，在我们的案例中，纳米纤维素处理是由纤维素纳米纤维（CNF）制成的。这是通过引入阳离子聚合物聚酰胺-表氯醇（PAAE）作为画布和 CNF 之间的中间层来实现的。对不同相对湿度（RH）水平下画布样品的形态、化学和机械评估表明，添加的 PAAE 层的附着力是加固过程中的一个主导因素。在引入 PAAE 后，观察到 CNF 对画布单纤维的涂层改善、画布纤维和 CNF 处理之间更高的粘附能，以及最终整体上更强的画布加固。然而，对于 PAAE 处理的画布，对吸湿和解吸的机械响应也有所增加。总的来说，这项研究表明了这些系统的复杂性，因此，使用多尺度方法对其进行评估是相关的。
