Robust Fabrication of Fluorescent Cellulosic Materials via Hantzsch Reaction

Abstract

Hantzsch reaction is one of the typical multicomponent reactions (MCRs), and it is employed herein to endow cellulosic materials with fluorescent properties. For example, acetoacetyl (ACAC)‐bearing cotton fabric prepared via transesterification with tert‐butyl acetoacetate is subjected to an aqueous Hantzsch reaction with formaldehyde and ammonium acetate at ambient temperature. A strong fluorescent emission around 460 nm is achieved within 10 min. XPS, fluorescent spectroscopy, and elemental analysis are used to confirm the presence of 1,4‐dihydropyridine (DHP) rings on the surface of the fabric. TGA, SEM, XRD, and mechanical testing results show that the modification process has minimum impact on intrinsic properties of the fabric. The strategy is also shown to be generally applicable to various forms of cellulosic materials and different aldehydes. This fast and simple approach enriches the application of MCR in modification of cellulose and cellulose derivatives.

Green fabrication of high strength, transparent cellulose-based films with durable fluorescence and UV-blocking performance

“…S3†), identifying the existence of DHP ring structures. 17,18 Additionally, the energy-dispersive spectroscopy (EDS) mapping images of the FC-FA film showed a uniform distribution of C, N and O elements (Fig. S4†), further suggesting that the DHP structure was anchored homogenously on the surface of cellulose.…”

High stability and recyclable cellulose-based fluorescent paper derived from waste bagasse for anti-counterfeiting

“…4c-d). The maximum excitation wavelength of uorescent paper obtained by different reaction time appeared at 380 nm, under these conditions, a broad emission spectrum rang from 400 to 600 nm was observed (Wang et al, 2021). For most cellulose-based uorescence materials, such as nano lm, cellulose-based microgel or waterborne ink etc., the time for preparation ranges from 30 to 360 min.…”

Fusion of Cellulose and Multicomponent Reactions: Benign by Design

“…A strong fluorescent emission at 460 nm is obtained within 10 min, which is associated with the generation of the DHP rings (Figure b–d). The presence of DHP motifs on the surface of the fabric was proved by fluorescent spectroscopy, XPS, and elemental analysis . The fluorescent modification did not affect the properties of cotton fabrics, which revealed to have still high thermal stability, smooth surfaces, and also admissible mechanical strength afterward.…”

“…Optical photos of (b) fluorescent fabric, (c) CAA-DHP, (d) fluorescent yarn under UV light (365 nm). Reproduced with permission from ref . Copyright 2021, Wiley-VCH.…”