Tunable afterglow for mechanical self-monitoring 3D printing structures

Abstract

Self-monitoring materials have promising applications in structural health monitoring. However, developing organic afterglow materials for self-monitoring is a highly intriguing yet challenging task. Herein, we design two organic molecules with a twisted donor-acceptor-acceptor’ configuration and achieve dual-emissive afterglow with tunable lifetimes (86.1–287.7 ms) by doping into various matrices. Based on a photosensitive resin, a series of complex structures are prepared using 3D printing technology. They exhibit tunable afterglow lifetime and Young’s Modulus by manipulating the photocuring time and humidity level. With sufficient photocuring or in dry conditions, a long-lived bright green afterglow without apparent deformation under external loading is realized. We demonstrate that the mechanical properties of complex 3D printing structures can be well monitored by controlling the photocuring time and humidity, and quantitively manifested by afterglow lifetimes. This work casts opportunities for constructing flexible 3D printing devices that can achieve sensing and real-time mechanical detection.

Recent Development of Photochromic Polymer Systems: Mechanism, Materials, and Applications

“…Common 3D printing technologies include SLA (stereolithography), DLP (digital light processing), LCD (liquid crystal panel), and FDM (fused deposition). There are many reported applications of 3D printing, such as for wearable devices [ 132 ], programmable gas sensors [ 133 ], structural health monitoring [ 134 ], etc.…”

Biodegradable Plant Oil-Based Bioadhesive with Ultrastrong Wet-Tissue Adhesion for Instant Sealing Hemostasis

“…In recent years, the photocuring technology has attracted much attention because it can enable the rapid curing through cross-linking between photosensitive molecule. 23 Herein, a plant oil-based bioadhesive is designed and developed through a facile reaction of epoxidized soybean oil (ESO) with methacrylic acid (MAA) and tannic acid (TA) (Scheme 1). The prepared bioadhesive with the addition of photoinitiator can be rapidly cured in situ at the wound site through photo-cross-linking under ultraviolet (UV) lightemitting diode (LED) (380−390 nm, 40 W) irradiation within 30 s, achieving ultrastrong wet-tissue adhesion and outstanding biocompatibility, while also considering good biodegradability and no-volume expansion for instant sealing hemostasis of traumatic internal organs and arterial bleeding.…”

“…However, this adhesive requires a high temperature and long curing time to achieve strong adhesion performance. In recent years, the photocuring technology has attracted much attention because it can enable the rapid curing through cross-linking between photosensitive molecule . Herein, a plant oil-based bioadhesive is designed and developed through a facile reaction of epoxidized soybean oil (ESO) with methacrylic acid (MAA) and tannic acid (TA) (Scheme ).…”