Radiation-Induced In Situ-Printed Nonconjugated Fluorescent Nonwoven Fabric with Superior Fluorescent Properties

Abstract

A new technique is proposed for the in situ printing of fluorescent fabrics with superior fluorescent properties that have the potential for continuous roll-to-roll production in the industry. Nonconjugated chemical moieties were covalently connected to polyethylene/polypropylene nonwoven fabric (PE/PP NWF) to successfully prepare fluorescent PE/PP NWF, which emits a bright blue light and has a high quantum yield (∼83.35%) that can be attributed to a unique aggregation-induced emission effect. The fluorescent PE/PP NWF exhibits excellent fluorescent stability under high shear forces during accelerated laundering and in harsh chemical environments. The fluorescent PE/PP NWF can also be tailored into diverse shapes and printed in situ with high resolution. The versatility of the method was also demonstrated by fabricating fluorescent materials with different polymer matrices such as Nylon 66 fiber and PE terephthalate membrane.

Pyrene-Based Nonwoven Fabric with Tunable Fluorescence Properties by Employing the Aggregation-Caused Quenching Effect

“…The crystallinity deteriorated and no new diffraction peak was observed for the grafted PE/PP NWF (SI Figure S3), indicating that the PGMA chains were distributed on the PE/PP NWF with a disordered architecture. 22 Additionally, the diameters of the single fibers of PE/PP NWF-g-PGMA increased to approximately 22.7 μm, based on the scanning electron microscopy (SEM) images (SI Figure S4), which was consistent with the results reported in previous studies on the surface grafting modification of fibers. 22,26,27,29 Subsequently, the Py units were covalently introduced onto the PE/PP NWF via an amination reaction.…”

“…In addition, the thermogravimetric (TG) and derivative TG (DTG) curves for PE/PP NWF- g -PGMA showed two new degradation processes at 150–240 °C and 240–350 °C (SI Figure S2), which were attributed to the thermal decomposition of the epoxy groups and residual PGMA chains, respectively. The crystallinity deteriorated and no new diffraction peak was observed for the grafted PE/PP NWF (SI Figure S3), indicating that the PGMA chains were distributed on the PE/PP NWF with a disordered architecture . Additionally, the diameters of the single fibers of PE/PP NWF- g -PGMA increased to approximately 22.7 μm, based on the scanning electron microscopy (SEM) images (SI Figure S4), which was consistent with the results reported in previous studies on the surface grafting modification of fibers. ,,, Subsequently, the Py units were covalently introduced onto the PE/PP NWF via an amination reaction.…”

“…The stretching vibrations of the epoxy group, CO, and  CO in the PGMA chains were observed at 905, 1146, and 1723 cm −1 , respectively, in the Fourier-transform infrared spectrum of PE/PP NWF-g-PGMA obtained after the graft polymerization reaction (SI Figure S1), indicating that the PGMA chains were connected to the PE/PP NWF surface. 22 In addition, the thermogravimetric (TG) and derivative TG (DTG) curves for PE/PP NWF-g-PGMA showed two new degradation processes at 150−240 °C and 240−350 °C (SI Figure S2), which were attributed to the thermal decomposition of the epoxy groups and residual PGMA chains, 29 respectively. The crystallinity deteriorated and no new diffraction peak was observed for the grafted PE/PP NWF (SI Figure S3), indicating that the PGMA chains were distributed on the PE/PP NWF with a disordered architecture.…”

“…Radiation-induced graft polymerization (RIGP) is an advanced technique that is mainly used for the surface modification of traditional polymers. − In recent studies, nonconjugated and AIE-based polyethylene/polypropylene nonwoven fabric (PE/PP NWF) was prepared via RIGP. Herein, for the first time, ACQ-based pyrene (Py) units were covalently connected to the surface of PE/PP NWF via RIGP followed by chemical modification.…”

Remarkable damage in talc caused by electron beam irradiation with a dose of up to 1000 kGy: lattice shrinkage in the Z- and Y-axis and corresponding intrinsic microstructural transformation process speculation

“…As the dose rate and irradiation level of b-rays in a short time might be very high and electron beam (EB) irradiation is normally used to simulate b-ray irradiation effect and modication, 6,7 in this work, pure talc powder was irradiated by an EB from a medium energy electron accelerator in air at a high current in a short time with dose up to 1000 kGy. Then, variations in chemical/crystalline structure and intrinsic microstructure transformation processes were explored, aiming to have a deeper understanding of lattice stability upon direct electron bombardment.…”