Nonlinear imaging and vibrational spectroscopic analysis of cellulosic fibres treated with COEX(R) flame-retardant for tapestry preservation
Year: 2022
Authors: Dal Fovo A., Striova J., Quintero Balbas D., Mattana S., Tacconi N., Cicchi R., Fontana R.
Autors Affiliation: Ist Nazl Ott CNR INO, Consiglio Nazl Ric, Largo Enrico Fermi 6, I-50125 Florence, Italy; Univ Firenze, Viale Idee 24, I-50019 Sesto Fiorentino, Italy.
Abstract: Cellulose-based fabrics are widely used in the preservation and storage of historic tapestries. Their ease of
flammability is a serious concern that greatly limits their applications and requires the development of
effective and safe flame-retardant treatments. In this work, we analysed linen and cotton textile samples
before and after COEX® treatment, a patented green technology imparting anti-flame properties by
functionalizing the cellulose molecules with phosphorus and sulphur groups. Some of the samples were
also exposed to photo-induced ageing after the treatment. The resulting structural and chemical
changes in both fibres were characterized by nonlinear optical imaging modalities, namely Second
Harmonic Generation (SHG) and Two-Photon Excited Fluorescence microscopies (TPEF), and Raman
and Attenuated Total Reflection – Fourier Transform Infrared (ATR-FTIR) spectroscopies.
Complementary results evidenced a reduction in microfibril crystallinity, attributed mainly to the
reduction of hydrogen bonding among cellulose macromolecules, with a concomitant increase in
fluorescence possibly due to the introduction of ester groups into cellulose chains and to
decomposition of lignin into fluorescent by-products.
Journal/Review: RSC ADVANCES
Volume: 12 (41) Pages from: 26744 to: 26752
More Information: This work was supported by Consiglio Nazionale delle Ricerche (CNR) [intervention program CNR4C] and the Regione Toscana [POR FSE 2014-2020 -Axis A Employment, Giovanisi] as part of the projects SuperTec3D and RS4ART.KeyWords: cellulose; textiles; preservation; flame-retardant; SHG; TPEF; Raman spectroscopyDOI: 10.1039/d2ra02384aImpactFactor: 3.900Citations: 3data from “WEB OF SCIENCE” (of Thomson Reuters) are update at: 2024-11-24References taken from IsiWeb of Knowledge: (subscribers only)Connecting to view paper tab on IsiWeb: Click hereConnecting to view citations from IsiWeb: Click here