Robust Miniemulsion PhotoATRP Driven by Red and Near-Infrared Light DOI Creative Commons
Xiaolei Hu, Rongguan Yin, Jaepil Jeong

и другие.

Journal of the American Chemical Society, Год журнала: 2024, Номер 146(19), С. 13417 - 13426

Опубликована: Май 1, 2024

Photoinduced polymerization techniques have gathered significant attention due to their mild conditions, spatiotemporal control, and simple setup. In addition homogeneous media, efforts been made implement photopolymerization in emulsions as a practical greener process. However, previous photoinduced reversible deactivation radical (RDRP) heterogeneous media has relied on short-wavelength lights, which limited penetration depth, resulting slow relatively poor control. this study, we demonstrate the first example of highly efficient miniemulsion ATRP open air driven by red or near-infrared (NIR) light. This was facilitated utilization water-soluble photocatalyst, methylene blue (MB+). Irradiation red/NIR light allowed for excitation MB+ subsequent photoreduction deactivator presence electron donors initiate mediate The NIR light-driven photoATRP provided successful synthesis polymers with low dispersity (1.09 ≤ Đ 1.29) quantitative conversion within an hour. study further explored impact kinetics reactors varying sizes large-scale reaction (250 mL), highlighting advantages longer-wavelength light, particularly dispersed owing its superior penetration. work opens new avenues robust emulsion techniques, offering more approach improved control efficiency.

Язык: Английский

Progress and Perspectives Beyond Traditional RAFT Polymerization DOI Creative Commons
Mitchell D. Nothling, Qiang Fu, Amin Reyhani

и другие.

Advanced Science, Год журнала: 2020, Номер 7(20)

Опубликована: Авг. 26, 2020

Abstract The development of advanced materials based on well‐defined polymeric architectures is proving to be a highly prosperous research direction across both industry and academia. Controlled radical polymerization techniques are receiving unprecedented attention, with reversible‐deactivation chain growth procedures now routinely leveraged prepare exquisitely precise polymer products. Reversible addition‐fragmentation transfer (RAFT) powerful protocol within this domain, where the unique chemistry thiocarbonylthio (TCT) compounds can harnessed control vinyl polymers. With intense recent focus RAFT, new strategies for initiation external have emerged that paving way preparing polymers demanding applications. In work, cutting‐edge innovations in RAFT opening up technique broader suite researchers explored. Emerging activating TCTs surveyed, which providing access into traditionally challenging environments polymerization. latest advances future perspectives applying RAFT‐derived also shared, goal convey rich potential an ever‐expanding range high‐performance

Язык: Английский

Процитировано

207

Porphyrinic Zirconium Metal–Organic Frameworks (MOFs) as Heterogeneous Photocatalysts for PET‐RAFT Polymerization and Stereolithography DOI
Liwen Zhang, Xiaobing Shi,

Zhiheng Zhang

и другие.

Angewandte Chemie International Edition, Год журнала: 2020, Номер 60(10), С. 5489 - 5496

Опубликована: Ноя. 12, 2020

Abstract In this study, porphyrinic zirconium (Zr) MOFs were investigated as heterogeneous photocatalysts for photoinduced electron transfer‐reversible addition‐fragmentation chain transfer (PET‐RAFT) polymerization of various monomers under a broad range wavelengths, producing polymers with high monomer conversions, narrow molecular weight distributions, low dispersity and good chain‐end fidelity. Screening Zr‐MOFs (Zn) containing Zn‐metalled ligands demonstrated that MOF‐525 the smallest size had best photocatalytic activity in PET‐RAFT polymerization, due to enhanced dispersion light penetration. Oxygen tolerance temporal control also during MOF catalysed PET‐RAFT. Results suggested rates significantly affected by changing surface area MOFs, could be easily separated recycled up five independent polymerizations without an obvious decrease efficiency. Finally, utilized create three‐dimensional polymeric objects resolution via visible mediated stereolithography open‐air environment.

Язык: Английский

Процитировано

150

Photocontrolled RAFT polymerization: past, present, and future DOI Creative Commons

Yungyeong Lee,

Cyrille Boyer, Min Sang Kwon

и другие.

Chemical Society Reviews, Год журнала: 2023, Номер 52(9), С. 3035 - 3097

Опубликована: Янв. 1, 2023

In this review, we provide a brief history, progress, and applications, discuss the remaining challenges of photocontrolled reversible addition-fragmentation chain transfer (RAFT) polymerization (i.e., photoinduced electron/energy transfer-RAFT (PET-RAFT), photoiniferter, photomediated cationic RAFT polymerization). Among these, visible-light-driven has attracted particular attention in recent years due to its benefits, including low energy consumption safe reaction procedure. Moreover, incorporation visible-light photocatalysis conferred attractive features, such as spatiotemporal control oxygen tolerance; however, clear understanding mechanism not been completely provided. We also present research efforts elucidate mechanisms with aid quantum chemical calculations combined experimental evidence. This review offers an insight into better design systems for desired applications helps realize full potential both academic- industrial-scale applications.

Язык: Английский

Процитировано

143

Rapid High‐Resolution 3D Printing and Surface Functionalization via Type I Photoinitiated RAFT Polymerization DOI
Kenneth Lee, Nathaniel Corrigan, Cyrille Boyer

и другие.

Angewandte Chemie International Edition, Год журнала: 2021, Номер 60(16), С. 8839 - 8850

Опубликована: Янв. 15, 2021

Abstract RAFT facilitated digital light projection 3D printing of polymeric materials provides a convenient and facile route for inducing post‐fabrication transformations via reactivation dormant chain transfer agents. In this work, we report the use Norrish type I photoinitiator in conjunction with agent to produce variety open‐air printable resins that rapidly cure under visible irradiation. The photoinitiator‐RAFT system polymerizes extremely quickly high build rates up 9.1 cm h −1 , representing 7‐fold increase compared previous mediated systems. printed containing thiocarbonylthio groups can be also produced using low concentrations divinyl comonomers initial resins, which has not been successfully achieved other photocontrolled polymerization techniques. Interestingly, inclusion agents significantly improves resolution formulations without agent, allowing fabrication intricate complex objects. Spatiotemporally controlled surface modifications objects from on material surfaces were performed one two‐pass configurations, multiple successive post‐printing same object.

Язык: Английский

Процитировано

124

Photo‐Iniferter RAFT Polymerization DOI Creative Commons
Matthias Hartlieb

Macromolecular Rapid Communications, Год журнала: 2021, Номер 43(1)

Опубликована: Ноя. 9, 2021

Light-mediated polymerization techniques offer distinct advantages over reactions fueled by thermal energy, such as high spatial and temporal control well the possibility to work under mild reaction conditions. Reversible addition-fragmentation chain-transfer (RAFT) is a highly versatile radical method that can be utilized variety of monomers produce vast number complex macromolecular structures. The use light drive RAFT-polymerization possible via multiple routes. Besides photo-initiators, or photo-catalysts, direct activation chain transfer agent controlling RAFT process in photo-iniferter (PI) an elegant way initiate reactions. Within this review, PI-RAFT its conventional are discussed detail.

Язык: Английский

Процитировано

123

Precision polymer synthesis by controlled radical polymerization: Fusing the progress from polymer chemistry and reaction engineering DOI Open Access
Yin‐Ning Zhou, Jin‐Jin Li, Tiantian Wang

и другие.

Progress in Polymer Science, Год журнала: 2022, Номер 130, С. 101555 - 101555

Опубликована: Май 7, 2022

Язык: Английский

Процитировано

113

Ultrasonics in polymer science: applications and challenges DOI
Arunjunai R. S. Santha Kumar,

Amrishkumar Padmakumar,

Uddhab Kalita

и другие.

Progress in Materials Science, Год журнала: 2023, Номер 136, С. 101113 - 101113

Опубликована: Март 22, 2023

Язык: Английский

Процитировано

60

Preparation of Polymerized High Internal Phase Emulsion Membranes with High Open-Cellular Extent and High Toughness via RAFT Polymerization DOI Open Access

Yulan Wu,

Jie Huang, Zanru Guo

и другие.

Polymers, Год журнала: 2025, Номер 17(4), С. 515 - 515

Опубликована: Фев. 17, 2025

Porous polymer membranes with highly interconnected open-cellular structure and high toughness are crucial for various application fields. Polymerized internal phase emulsions (polyHIPEs), which usually exist as monoliths, possess the advantages of porosity good connectivity. However, it is difficult to prepare due brittleness easy pulverization. Copolymerizing acrylate soft monomers can effectively improve polyHIPEs, but cause emulsion instability pore collapse. In this paper, stable HIPEs a content butyl (41.7 mol% 75 based on monomers) be obtained by using composite emulsifier (30 wt.% consisting Span80/DDBSS (9/2 in molar ratio) adding 0.12 mol·L-1 CaCl2 according aqueous concentration. On basis, polyHIPE extent firstly prepared via reversible addition-fragmentation chain transfer (RAFT) polymerization. The addition RAFT agent significantly improves mechanical properties without affecting structure. polymerization enhanced compared conventional free radical When ratio acrylate/styrene/divinylbenzene 7/4/1, membrane presents plastic deformation during tensile test. modulus reaches 93.04 ± 12.28 kJ·m-3 while 92.35%, also has excellent thermal stability.

Язык: Английский

Процитировано

3

Thermo-Responsive Poly (N-isopropyl acrylamide-b-vinylimidazole)/Pd Catalyst: Catalytic Application of Suzuki–Miyaura Coupling Reaction in Water DOI
Soheila Ghasemi,

N. Zare,

Milad Ghezelsofloo

и другие.

Catalysis Surveys from Asia, Год журнала: 2025, Номер unknown

Опубликована: Янв. 5, 2025

Язык: Английский

Процитировано

2

Metal-Free Cationic Polymerization of Vinyl Ethers with Strict Temporal Control by Employing an Organophotocatalyst DOI
Xun Zhang, Yu Jiang, Ma Qiang

и другие.

Journal of the American Chemical Society, Год журнала: 2021, Номер 143(17), С. 6357 - 6362

Опубликована: Апрель 26, 2021

By virtue of spatiotemporal control over the chain propagating, visible-light-regulated organocatalytic photoredox cationic polymerization provides an appealing approach for construction metal-free, well-defined polymers and materials. However, so far, organic photocatalysts capable mediated vinyl ethers are quite limited, photocontrol or efficiency is often eroded due to difficulty in achieving a good activation–deactivation balance, which greatly dependent on redox property catalyst. Here, we introduce new type photocatalysts, bisphosphonium salts, show high performance photoregulated reversible addition–fragmentation transfer allow synthesis poly(vinyl ethers) with predictable molecular weights narrow dispersities at low ppm catalyst loadings under visible light. In particular, tunable potential excellent stability endow salts strict temporal control, thus enabling metal-free halt long dark period.

Язык: Английский

Процитировано

85