Transforming polyethylene and polypropylene into nontraditional fluorescent polymers by thermal oxidation

Zhao, Yaxin; Long, Jiayu; Zhuang, Peifeng; Ji, Ying; He, Changcheng; Wang, Huiliang

doi:10.1039/d1tc05520h

Cited by 20 publications

(21 citation statements)

References 45 publications

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“…As depicted in Figure d,e, the novel peak that appeared at 3384 cm –1 corresponded to the −NH stretching vibration of the resulting amines of oxidized PEI, and −NH deformation vibration shifted from 1600 cm –1 of PEI to 1630 cm –1 in ohPEI. Furthermore, the bending vibration of −CH 2 of PEI banded at 1294 cm –1 changed to 1302 cm –1 , which was rationally attributed to the −CH 2 of ohPEI. ,, These indicated the successful oxidation of hPEI. Meanwhile, the peaks centered at 1437 and 1349 cm –1 were the characteristics of asymmetric stretching relaxion of B–O–C (Figure f), confirming the formation of borate ester.…”

Section: Resultsmentioning

confidence: 82%

“…Furthermore, the bending vibration of −CH 2 of PEI banded at 1294 cm −1 changed to 1302 cm −1 , which was rationally attributed to the −CH 2 of ohPEI. 30,34,37 These indicated the successful oxidation of hPEI. Meanwhile, the peaks centered at 1437 and 1349 cm −1 were the characteristics of asymmetric stretching relaxion of B−O−C (Figure 1f), 38 confirming the formation of borate ester.…”

Section: Fabrication and Characterization Of The Polymermentioning

confidence: 86%

“…In natural systems, many natural compounds such as biopolymers without aromatic building blocks can self-assemble with each other and form clusters by heteroatom-involved intermolecular interactions. − The extended through-space conjugations (TSCs) of n –π*, n – n , and π–π* interactions often result in unusual fluorescence . In recent studies, it is revealed that the thermal oxidation treatment of polymers would lead to an enhanced TSC of polymers .…”

Section: Introductionmentioning

confidence: 99%

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Ultrafast Self-Healing, Highly Stretchable, Adhesive, and Transparent Hydrogel by Polymer Cluster Enhanced Double Networks for Both Strain Sensors and Environmental Remediation Application

Hou

et al. 2022

ACS Appl. Mater. Interfaces

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Stretchable, healable, biocompatible, and conductive hydrogels are one of the promising candidates for both wearable electronics and environmental remediation applications. To date, the design of hydrogels that integrate ultrafast self-healing with high efficiency (seconds), high stretchability, and biocompatibility and reversibility into one system is not an easy task. Herein, we demonstrate a general oxidation approach to accelerate the hydrogelation of hPEI-based double network gels via the generation of fluorescent polymer clusters at room temperature or triggered by the heating–cooling process. The resulting ohPEI hydrogel has the merit of biocompatibility over most reported hPEI hydrogels for strain sensors. It shows a high conductivity (1.3 S/m), an ultrafast self-healing ability (<3 s, 98% healing efficiency within 60 s), a high stretchability (∼1850 and ∼7000% in deformation), and reversible adhesivity on various material surfaces. The excellent performance of the hydrogel is ascribed to the cooperative and hierarchical interactions of four types of dynamic combinations, including the reversible borate bond, hydrogen bonding, electrostatic interaction, and polymer cluster interactions. The reversible fabrication process by the one-spot method (just by simple mixing of the components) and superior properties of the hydrogel make it an ideal candidate for a wearable strain sensor to monitor human motions and physiological activities. Moreover, it is also a good hydrogel absorbent for phase separation absorption of volatile organic compounds with a high capacity (for acetone: 4.75 g g–1), reusability, and an easy handling process.

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Section: Resultsmentioning

confidence: 82%

Section: Fabrication and Characterization Of The Polymermentioning

confidence: 86%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Ultrafast Self-Healing, Highly Stretchable, Adhesive, and Transparent Hydrogel by Polymer Cluster Enhanced Double Networks for Both Strain Sensors and Environmental Remediation Application

Hou

et al. 2022

ACS Appl. Mater. Interfaces

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“…Especially, the emission wavelength of the third-generation dendrimer is over 600 nm under the excitation wavelengths of 560 nm, which is caused by the formed larger heteroatom clusters. Increasing the oxygen density can also endow polymers with long-wavelength emissions. , Thus, a higher oxygen density will generate larger clusters and long-wavelength emissions. Yan et al found that the electron cloud of carbonyl and CC bonds in polysiloxane will overlap and form multiple through-space conjugation rings, and blue, green, and red light will be generated under different excitations; hence, the emission mechanism named multiring-induced multicolor emission is proposed .…”

Section: Introductionmentioning

confidence: 99%

High-Efficiency Long-Wavelength Fluorescent Hyperbranched Polysiloxanes: Synthesis, Emission Mechanism, Information Encryption, and Film Preparation

et al. 2022

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Unconventional fluorescent polymers possess the advantages of excellent biocompatibility, environmental friendliness, and facile structural regulation; however, such polymers usually have low fluorescence intensity and quantum yields in the long-wavelength range. In this work, three kinds of high-efficiency long-wavelength emissive hyperbranched polysiloxanes are obtained by introducing aromatic amino acids. These functionalized hyperbranched polysiloxanes have high fluorescence intensity and quantum yields in green, yellow, and red emission regions. Experimental results and density functional theory calculations reveal that the long-wavelength emission comes from the enhanced electronic communication among the conjugated π bonds, electron-rich atoms, and −Si(O)3 and other functional groups. Especially, the conjugated π bonds efficiently enlarge the spatial electronic delocalizations, resulting in the high-efficiency long-wavelength emission. Moreover, the prepared polymers show excellent applications in information encryption and film preparation. This work could serve as a guide to develop high-efficiency long-wavelength unconventional fluorescent polymers.

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“…In recent years, researchers have found that some nonconventional luminogens without aromatic building blocks also exhibit a luminescent property. − Meanwhile, the reported nonconventional luminescent materials show unique clustering-triggered emission (CTE) characteristics. Their emission behavior shows concentration-enhanced emission, aggregation-induced emission (AIE), and excitation wavelength dependence.…”

Section: Introductionmentioning

confidence: 99%

Research on Circularly Polarized Luminescent and Clustering-Triggered Emission Properties of Cholesteryl Benzoate

et al. 2022

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Circularly polarized luminescence (CPL) materials have attracted intensive attention due to their exceptional photophysical properties. However, it has been rarely reported in the field of nontraditional luminescence. It is of great significance to construct circularly polarized luminescent materials with atypical luminescent groups without traditional conjugated structures. Cholesteryl benzoate is a classical cholesteric liquid crystal, and we coincidentally find that it shows clustering-triggered emission behavior in recent studies, which means that cholesteryl benzoate can emit circularly polarized light at the cholesteric liquid crystal phase. Therefore, we synthesized cholesteryl benzoate and studied its photophysical properties in detail. The findings show that cholesteryl benzoate shows triggered emission behavior. The research results suggest that the emission behavior of cholesteric benzoate shows concentration-enhanced emission, aggregation-induced emission (AIE), excitation wavelength dependence, and low-temperature phosphorescence luminescence characteristics. The solid-state circularly polarized luminescence (CPL) property of cholesteryl benzoate quenched by the cholesteric phase was also studied, and the measured luminescence asymmetry factor (g lum) could achieve −2.6 × 10–3. In addition, we also simulated the luminescence mechanism of cholesteryl benzoate by theoretical calculation.

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Transforming polyethylene and polypropylene into nontraditional fluorescent polymers by thermal oxidation

Abstract: Polyolefins like polyethylene (PE) and polypropylene (PP) without any conventional or nonconventional fluorescent chromophores have never been considered as raw materials for the preparation of fluorescent polymers. Here we report...

Cited by 20 publications

References 45 publications

Ultrafast Self-Healing, Highly Stretchable, Adhesive, and Transparent Hydrogel by Polymer Cluster Enhanced Double Networks for Both Strain Sensors and Environmental Remediation Application

Ultrafast Self-Healing, Highly Stretchable, Adhesive, and Transparent Hydrogel by Polymer Cluster Enhanced Double Networks for Both Strain Sensors and Environmental Remediation Application

High-Efficiency Long-Wavelength Fluorescent Hyperbranched Polysiloxanes: Synthesis, Emission Mechanism, Information Encryption, and Film Preparation

Research on Circularly Polarized Luminescent and Clustering-Triggered Emission Properties of Cholesteryl Benzoate

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