Organic near infrared (NIR) persistent-luminescence systems with bright and long-lived emission are highly valuable for applications in communication, imaging, sensors. However, realizing these materials (especially lifetime over 0.1 s) is a challenge, mainly because of non-radiative quenching their excitons. Herein, universal strategy stepwise Förster resonance energy transfer (FRET) NIR system remarkable persistent luminescence (up to 0.2 s at 810 nm) presented, based on new...

Developing stable room-temperature phosphorescence (RTP) emission without being affected by moisture and mechanical force remains a great challenge for purely organic systems, due to their triplet states sensitive the infinitesimal motion of phosphors oxygen quencher. We report kind highly robust phosphorescent doping rigid phosphor into copolymer (polyvinyl butyral resin) matrix with balance mutually exclusive features, including rigidly hydrophilic hydrogen bond network elastically...

Abstract Organic room temperature phosphorescence (RTP) has significant potential in various applications of information storage, anti-counterfeiting, and bio-imaging. However, achieving robust organic RTP emission the single-component system is challenging to overcome restriction crystalline state or other rigid environments with cautious treatment. Herein, we report a persistent aggregated forms, such as crystal, fine powder, even amorphous states. Our experimental data reveal that...

In the present work, a novel molecular strategy was employed to fabricate two-way shape memory polymer (2WSMP), which is an interpenetrating network (IPN) with elastomeric and crystalline components leading "switch–spring" composition. this 2WSMP switch, PCL network, responsible for reversible shrinkage. While spring, compressed PTMEG provides push force expansion. This IPN has desired effect (2WSME) as proved by DMA.

Sulfur-containing polymers have renewed widespread attention due to their fascinating properties like high refractive index and semiconducting character. However, examples of direct polymerization involving elemental sulfur are limited. Herein, a new strategy prepare polythioamide (PTA) by aliphatic primary diamines in the presence is reported. The p-xylylenediamine (1) at 110 °C N-methyl-2-pyrrolidinone afforded PTA1 Mw yield when feed ratio [1]:[S] ranged from 1:2 1:3. 1H NMR 13C spectra...

A kind of NIR afterglow with a lifetime 0.16 s at 808 nm was prepared using triplet excimer (PVB@PVA) as the donor. PYB 2 @PVA containing more excimers is beneficial to improve luminescence Cy7 acceptor via triplet-to-singlet energy transfer.

The overexpressed glutathione (GSH) in tumor cells was a crucial obstacle to improving the performance of photodynamic therapy (PDT). Complex approaches combined with different substances for PDT and GSH depletion brought potential toxic/side effects metal ions or used unsustainable disulfide bonds. Therefore, photosensitizer (PS) capable continuously depleting keeping reactive oxygen species (ROS) generation from falling simultaneously is still challenge. Here, newly designed Janus-PSs TBBr...

Using recently developed alkane C–H amination chemistry, a mild postmodification of polyethylene (PE) to form C–N grafts without using metal catalyst is reported. This method applies N-hydroxyphthalimide (NHPI) as an organic cleave bonds generate carbon radical that reacts with the N═N dialkyl azodicarboxylates hydrazine unit. The linear PE was successfully conducted bis(2,2,2-trichloroethyl)azodicarboxylate (BTCEAD) and di-tert-butyl azodicarboxylate (DBAD) in presence NHPI...

Inspired by the natural motors capable of performing multiple tasks in complex living environments, synthetic nanomotors emerge as a potential vehicle for revolutionizing biomedical processes. Yet current suffer from decreased and even completely hindered motion physiological environment, shadowing future this booming field. To address problem, unimolecular nanomotor based on molecular bottlebrush (MBB) sub-100 nm size is reported. This motor constructed precisely via controlled radical...

The Förster resonance energy transfer (FRET) process has been utilized to construct host–guest systems with stimuli-responsive room-temperature phosphorescence (RTP).

Organic room-temperature phosphorescence (RTP) materials have demonstrated great potential applications in optoelectronics, anticounterfeiting, and biomedicine fields. Among them, the RTP properties of host–guest systems can be easily regulated by changing their component parameters, which has attracted widespread attention. However, key factor hosts (crystalline or noncovalent interaction network) for boosting emission at room temperature was still unclear. Herein, a triphenyl phosphor...

Recent advancements have focused on developing nanoscale persistent room-temperature phosphorescence (pRTP) structures to expand their applicability in biomedical fields. Traditional fabrication methods typically produce surface-coated core-shell pRTP nanoparticles composed of nonbiocompatible emitters at very high concentrations the core. To overcome this limitation, polymeric nanosystems been presented study as a promising alternative by embedding RTP molecules within biocompatible polymer...

Highly soluble and optically transparent polyimides with excellent thermal stability were prepared by the introduction of alkyl naphthalene groups into a single diamine monomer under microwave-assisted polymerization.

Molecular bottlebrushes featuring brush-on-brush (BoB) architecture were prepared by combining azide–alkyne click chemistry, ring-opening polymerization (ROP), and atom transfer radical (ATRP). Primary side chains of diblock copolymers with a poly(ε-caprolactone) (PCL) block poly(α-bromo-ε-caprolactone) (P(CL-Br)) synthesized ROP then grafted onto PCL backbone the reaction. Then secondary poly(oligo(ethylene glycol) acrylate) (POEGA) from P(CL-Br) ATRP, yielding an amphiphilic core/shell...

ABSTRACT This article reports a chromic polymer, which is responsive to its shape memory properties and has both the behavior of polymers materials. We employed strategy fabricate such smart material, represents new principle for making material made polyurethane with tetraphenylethylene units (0.1 wt %) covalently connected soft‐segments (PCL, M w = 4000). The displays biocompatibility, fixity 88–93%, almost 100% recovery reversible mechanochromic, solvatochromic, thermochromic effect....

Abstract The molecular structural design learned from natural materials enables synthetic polymers with desirable and unique features to be fabricated. Inspired by spider silks, short‐chain polyalanine (PA) is introduced into multiblock biopolymers poly(ε‐caprolactone) segments via a coupling reaction. As result, PA in form similar β‐sheet crystals that of spidroins. These new are found exhibit nearly complete shape recovery high fixity, along significantly improved thermal stability due the...

The peripheral nervous system (PNS) may be damaged by traffic accidents and natural disasters. Nerve repair regeneration are unique clinical challenges for surgeons. A smart nerve conduit (SNC) is designed that can significantly simplify the surgery process achieve optimal (PNR) automatic gradual lengthening. For this purpose, five macromers with different rac ‐lactide to glycolide weight ratios synthesized characteristics of networks studied. Cyclic thermomechanical measurements indicate...

Generally, a typical mechanochromophore produces color change through chemical transformation into one or two identical new chromophores/fluorophores under applied mechanical force. Herein, we introduce novel mechanophore based on an anthracene-aminomaleimide Diels-Alder (DA) adduct featuring distinct and latent fluorophores. This nonfluorescent undergoes retro-DA reaction upon mechanochemical activation in solution the solid state, generating respective anthracene aminomaleimide fragments...

Novel biobased polyimides with good optical transparency and combined properties were synthesized from biomass isomannide-derived diamines and/or dianhydrides, thus providing a new approach to develop sustainable materials of high performance.