Articles de revues : « RAFT photo-polymerization »

1

Hartlieb, Matthias. « Photo‐Iniferter RAFT Polymerization ». Macromolecular Rapid Communications 43, n^o 1 (19 novembre 2021) : 2100514. http://dx.doi.org/10.1002/marc.202100514.

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Hartlieb, Matthias. « Photo‐Iniferter RAFT Polymerization ». Macromolecular Rapid Communications 43, n^o 1 (janvier 2022) : 2270003. http://dx.doi.org/10.1002/marc.202270003.

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Li, Jiajia, Xiangqiang Pan, Na Li, Jian Zhu et Xiulin Zhu. « Photoinduced controlled radical polymerization of methyl acrylate and vinyl acetate by xanthate ». Polymer Chemistry 9, n^o 21 (2018) : 2897–904. http://dx.doi.org/10.1039/c8py00050f.

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Jiang, Ruming, Meiying Liu, Qiang Huang, Hongye Huang, Qing Wan, Yuanqing Wen, Jianwen Tian, Qian-yong Cao, Xiaoyong Zhang et Yen Wei. « Fabrication of multifunctional fluorescent organic nanoparticles with AIE feature through photo-initiated RAFT polymerization ». Polymer Chemistry 8, n^o 47 (2017) : 7390–99. http://dx.doi.org/10.1039/c7py01563a.

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Zhang, Junle, Mengya Li, Yanjie He, Xiaomeng Zhang, Zhe Cui, Peng Fu, Minying Liu, Xiaoguang Qiao, Qingxiang Zhao et Xinchang Pang. « From 0-dimension to 1-dimensions : Au nanocrystals as versatile plasmonic photocatalyst for broadband light induced RAFT polymerization ». Polymer Chemistry 12, n^o 16 (2021) : 2439–46. http://dx.doi.org/10.1039/d1py00088h.

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Quan, Qinzhi, Honghong Gong et Mao Chen. « Preparation of semifluorinated poly(meth)acrylates by improved photo-controlled radical polymerization without the use of a fluorinated RAFT agent : facilitating surface fabrication with fluorinated materials ». Polymer Chemistry 9, n^o 30 (2018) : 4161–71. http://dx.doi.org/10.1039/c8py00990b.

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An, Nankai, Xi Chen et Jinying Yuan. « Non-thermally initiated RAFT polymerization-induced self-assembly ». Polymer Chemistry 12, n^o 22 (2021) : 3220–32. http://dx.doi.org/10.1039/d1py00216c.

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This review summarizes the recent non-thermal initiation methods in RAFT mediated polymerization-induced self-assembly (PISA), including photo-, redox/oscillatory reaction-, enzyme- and ultrasound wave-initiation.

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Wang, Wulong, Sheng Zhong, Guicheng Wang, Hongliang Cao, Yun Gao et Weian Zhang. « Photo-controlled RAFT polymerization mediated by organic/inorganic hybrid photoredox catalysts : enhanced catalytic efficiency ». Polymer Chemistry 11, n^o 18 (2020) : 3188–94. http://dx.doi.org/10.1039/d0py00171f.

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Photo-controlled RAFT polymerization mediated by an organic/inorganic hybrid photoredox catalyst (ZnTPP–POSS) was performed and showed enhanced catalytic efficiency compared with the ZnTPP photocatalyst.

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Chen, Mao, Honghong Gong et Yu Gu. « Controlled/Living Radical Polymerization of Semifluorinated (Meth)acrylates ». Synlett 29, n^o 12 (18 avril 2018) : 1543–51. http://dx.doi.org/10.1055/s-0036-1591974.

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Fluorinated polymers are important materials for applications in many areas. This article summarizes the development of controlled/living radical polymerization (CRP) of semifluorinated (meth)acrylates, and briefly introduces their reaction mechanisms. While the classical CRP such as atom transfer radical polymerization (ATRP), reversible addition-fragmentation chain transfer (RAFT) polymerization and nitroxide-mediated radical polymerization (NMP) have promoted the preparation of semifluorinated polymers with tailor-designed architectures, recent development of photo-CRP has led to unprecedented accuracy and monomer scope. We expect that synthetic advances will facilitate the engineering of advanced fluorinated materials with unique properties.1 Introduction2 Atom Transfer Radical Polymerization3 Reversible Addition-Fragmentation Chain Transfer Polymerization4 Nitroxide-Mediated Radical Polymerization5 Photo-CRP Mediated with Metal Complexes6 Metal-free Photo-CRP7 Conclusion

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Cabannes-Boué, Benjamin, Qizhi Yang, Jacques Lalevée, Fabrice Morlet-Savary et Julien Poly. « Investigation into the mechanism of photo-mediated RAFT polymerization involving the reversible photolysis of the chain-transfer agent ». Polymer Chemistry 8, n^o 11 (2017) : 1760–70. http://dx.doi.org/10.1039/c6py02220k.

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A new dithiocarbamate with a N-carbazole Z group is synthesized and investigated as a chain-transfer agent (CTA) in a photo-mediated RAFT polymerization mechanism involving its partial and reversible photolysis.

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Bagheri, Ali, Kyle Edward Engel, Chris William Anderson Bainbridge, Jiangtao Xu, Cyrille Boyer et Jianyong Jin. « 3D printing of polymeric materials based on photo-RAFT polymerization ». Polymer Chemistry 11, n^o 3 (2020) : 641–47. http://dx.doi.org/10.1039/c9py01419e.

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Lehnen, Anne-Catherine, Jan A. M. Kurki et Matthias Hartlieb. « The difference between photo-iniferter and conventional RAFT polymerization : high livingness enables the straightforward synthesis of multiblock copolymers ». Polymer Chemistry 13, n^o 11 (2022) : 1537–46. http://dx.doi.org/10.1039/d1py01530c.

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The impact of reversible deactivation in photo-inifierter RAFT polymerization on control and livingness of the process is investigated. The findings are used to create multiblock copolymers with high molecular weight and efficient chain extension.

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Tkachenko, Vitalii, Camélia Matei Ghimbeu, Cyril Vaulot, Loïc Vidal, Julien Poly et Abraham Chemtob. « RAFT-photomediated PISA in dispersion : mechanism, optical properties and application in templated synthesis ». Polymer Chemistry 10, n^o 18 (2019) : 2316–26. http://dx.doi.org/10.1039/c9py00209j.

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Yang, Qizhi, Marc Guerre, Vincent Ladmiral et Bruno Ameduri. « Thermal and photo-RAFT polymerization of 2,2,2-trifluoroethyl α-fluoroacrylate ». Polymer Chemistry 9, n^o 24 (2018) : 3388–97. http://dx.doi.org/10.1039/c8py00571k.

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RAFT polymerization of 2,2,2-trifluoroethyl α-fluoroacrylate (FATRIFE) was studied under thermal conditions and light irradiation in the presence of four chain transfer agents. Polymers with narrow dispersities were obtained in the presence of trithiocarbonate CTA₂, and this further led to fluorinated block copolymers.

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Liu, Dongdong, Ruiming Zeng, Hao Sun, Li Zhang et Jianbo Tan. « Blue Light-Initiated Alcoholic RAFT Dispersion Polymerization of Benzyl Methacrylate : A Detailed Study ». Polymers 11, n^o 8 (1 août 2019) : 1284. http://dx.doi.org/10.3390/polym11081284.

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Blue light-initiated alcoholic reversible addition-fragmentation chain transfer (RAFT) dispersion polymerization of benzyl methacrylate (BzMA) using bis (acyl) phosphane oxide (BAPO) as the photo-initiator is developed to prepare diblock copolymer nano-objects. High monomer conversion (95%) was achieved within 2 h of blue light irradiation in an isopropanol/water mixture. Effects of solvent, light intensity, and reaction temperature on the polymerization kinetics were evaluated. Finally, the effect of reaction temperature on the morphologies of diblock copolymer nano-objects was investigated and two morphological phase diagrams were constructed at 25 and 70 °C. Transmission electron microscopy (TEM) measurement confirmed that increasing the reaction temperature promoted the evolution of higher order morphology. We believe this study will provide more mechanistic insights into alcoholic RAFT dispersion polymerization for the creation of diblock copolymer nano-objects with well-defined structures.

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Johnson, Charles H. J., Thomas H. Spurling et Graeme Moad. « Evolution of Molar Mass Distributions Using a Method of Partial Moments : Initiation of RAFT Polymerization ». Polymers 14, n^o 22 (18 novembre 2022) : 5013. http://dx.doi.org/10.3390/polym14225013.

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We describe a method of partial moments devised for accurate simulation of the time/conversion evolution of polymer composition and molar mass. Expressions were derived that enable rigorous evaluation of the complete molar mass and composition distribution for shorter chain lengths (e.g., degree of polymerization, Xn = N < 200 units) while longer chains (Xn ≥ 200 units) are not neglected, rather they are explicitly considered in terms of partial moments of the molar mass distribution, μxN(P)=∑n=N+1∞nx[Pn] (where P is a polymeric species and n is its’ chain length). The methodology provides the exact molar mass distribution for chains Xn < N, allows accurate calculation of the overall molar mass averages, the molar mass dispersity and standard deviations of the distributions, provides closure to what would otherwise be an infinite series of differential equations, and reduces the stiffness of the system. The method also allows for the inclusion of the chain length dependence of the rate coefficients associated with the various reaction steps (in particular, termination and propagation) and the various side reactions that may complicate initiation or initialization. The method is particularly suited for the detailed analysis of the low molar mass portion of molar mass distributions of polymers formed by radical polymerization with reversible addition-fragmentation chain transfer (RAFT) and is relevant to designing the RAFT-synthesis of sequence-defined polymers. In this paper, we successfully apply the method to compare the behavior of thermally initiated (with an added dialkyldiazene initiator) and photo-initiated (with a RAFT agent as a direct photo-iniferter) RAFT-single-unit monomer insertion (RAFT-SUMI) and oligomerization of N,N-dimethylacrylamide (DMAm).

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Li, Na, Dongdong Ding, Xiangqiang Pan, Zhengbiao Zhang, Jian Zhu, Cyrille Boyer et Xiulin Zhu. « Temperature programed photo-induced RAFT polymerization of stereo-block copolymers of poly(vinyl acetate) ». Polym. Chem. 8, n^o 39 (2017) : 6024–27. http://dx.doi.org/10.1039/c7py01531c.

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Li, Jiajia, Mengmeng Zhang, Jian Zhu et Xiulin Zhu. « Investigation into the Direct Photolysis Process of Photo-Induced RAFT Polymerization by ESR Spin Trapping ». Polymers 11, n^o 10 (21 octobre 2019) : 1722. http://dx.doi.org/10.3390/polym11101722.

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The direct photolysis of reversible addition fragmentation chain transfer (RAFT) agents under visible light was demonstrated by electron spin resonance (ESR) using 5,5-dimethyl-1-pyrroline N-oxide as a typical spin trap. The hyperfine coupling lines obtained by ESR spectroscopy showed the successful capture of the carbon-centered and the sulfur-centered radical. Photo-polymerization of vinyl acetate under different wavelengths was performed to verify the effects of wavelength on the process. The effect of the R group of RAFT agents on the photolysis was investigated by spin-trapping experiments using poly (butyl acrylate) and poly (vinyl acetate) as macroRAFT agents. The quantitative experiment showed the yield of photolysis of a xanthate to be only 0.023% under λ > 440 nm.

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Wu, Chenyu, Sivaprakash Shanmugam, Jiangtao Xu, Jian Zhu et Cyrille Boyer. « Chlorophyll a crude extract : efficient photo-degradable photocatalyst for PET-RAFT polymerization ». Chemical Communications 53, n^o 93 (2017) : 12560–63. http://dx.doi.org/10.1039/c7cc07663k.

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Wang, Zhilei, Zipeng Zhang, Chenyu Wu, Zikuan Wang et Wenjian Liu. « Pushing the Limit of Photo-Controlled Polymerization : Hyperchromic and Bathochromic Effects ». Molecules 29, n^o 10 (18 mai 2024) : 2377. http://dx.doi.org/10.3390/molecules29102377.

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The photocatalyst (PC) zinc tetraphenylporphyrin (ZnTPP) is highly efficient for photoinduced electron/energy transfer reversible addition-fragmentation chain transfer (PET-RAFT) polymerization. However, ZnTPP suffers from poor absorbance of orange light by the so-called Q-band of the absorption spectrum (maximum absorption wavelength λmax = 600 nm, at which molar extinction coefficient εmax = 1.0×104 L/(mol·cm)), hindering photo-curing applications that entail long light penetration paths. Over the past decade, there has not been any competing candidate in terms of efficiency, despite a myriad of efforts in PC design. By theoretical evaluation, here we rationally introduce a peripheral benzo moiety on each of the pyrrole rings of ZnTPP, giving zinc tetraphenyl tetrabenzoporphyrin (ZnTPTBP). This modification not only enlarges the conjugation length of the system, but also alters the a1u occupied π molecular orbital energy level and breaks the accidental degeneracy between the a1u and a2u orbitals, which is responsible for the low absorption intensity of the Q-band. As a consequence, not only is there a pronounced hyperchromic and bathochromic effect (λmax = 655 nm and εmax = 5.2×104 L/(mol·cm)) of the Q-band, but the hyperchromic effect is achieved without increasing the intensity of the less useful, low wavelength absorption peaks of the PC. Remarkably, this strong 655 nm absorption takes advantage of deep-red (650–700 nm) light, a major component of solar light exhibiting good atmosphere penetration, exploited by the natural PC chlorophyll a as well. Compared with ZnTPP, ZnTPTBP displayed a 49% increase in PET-RAFT polymerization rate with good control, marking a significant leap in the area of photo-controlled polymerization.

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Zhou, Jiemei, Chunyan Hong et Caiyuan Pan. « The photo-controlled polymerization-induced self-assembly and reorganization process for fabrication of polymeric nanomaterials ». Materials Chemistry Frontiers 1, n^o 6 (2017) : 1200–1206. http://dx.doi.org/10.1039/c6qm00380j.

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A visible light mediated reversible addition–fragmentation chain transfer (RAFT) dispersion polymerization of benzyl methacrylate (BzMA) is conducted in ethanol using poly(2-dimethylaminoethyl methacrylate) (PDMAEMA) as a macro-chain transfer agent (macro-CTA), affording polymeric nanomaterials with various morphologies.

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Romero Castro, Valeria Lizeth, Brahim Nomeir, Ana Andreea Arteni, Malika Ouldali, Jean-Luc Six et Khalid Ferji. « Dextran-Coated Latex Nanoparticles via Photo-RAFT Mediated Polymerization Induced Self-Assembly ». Polymers 13, n^o 23 (23 novembre 2021) : 4064. http://dx.doi.org/10.3390/polym13234064.

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Polysaccharide coated nanoparticles represent a promising class of environmentally friendly latex to replace those stabilized by small toxic molecular surfactants. We report here an in situ formulation of free-surfactant core/shell nanoparticles latex consisting of dextran-based diblock amphiphilic copolymers. The synthesis of copolymers and the immediate latex formulation were performed directly in water using a photo-initiated reversible addition fragmentation chain transfer-mediated polymerization induced self-assembly strategy. A hydrophilic macromolecular chain transfer-bearing photosensitive thiocarbonylthio group (eDexCTA) was first prepared by a modification of the reducing chain end of dextran in two steps: (i) reductive amination by ethylenediamine in the presence of sodium cyanoborohydride, (ii) then introduction of CTA by amidation reaction. Latex nanoparticles were then formulated in situ by chain-extending eDexCTA using 2-hydroxypropyl methacrylate (HPMA) under 365 nm irradiation, leading to amphiphilic dextran-b-poly(2-hydroxypropyl methacrylate) diblock copolymers (DHX). Solid concentration (SC) and the average degree of polymerization - Xnˉ- of PHPMA block (X) were varied to investigate their impact on the size and the morphology of latex nanoparticles termed here SCDHX. Light scattering and transmission electron microscopy analysis revealed that SCDHX form exclusively spherical nano-objects. However, the size of nano-objects, ranging from 20 nm to 240 nm, increases according to PHPMA block length.

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Hakobyan, Karen, Christopher S. P. McErlean et Markus Müllner. « Activating ATRP Initiators to Incorporate End-Group Modularity into Photo-RAFT Polymerization ». Macromolecules 53, n^o 23 (23 novembre 2020) : 10357–65. http://dx.doi.org/10.1021/acs.macromol.0c01697.

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Miao, Xuelang, Jiajia Li, Zhengbiao Zhang, Zhenping Cheng, Wei Zhang, Jian Zhu et Xiulin Zhu. « Dimanganese decacarbonyl/2-cyanoprop-2-yl-1-dithionaphthalate : toward sunlight induced RAFT polymerization of MMA ». Polym. Chem. 5, n^o 16 (2014) : 4641–48. http://dx.doi.org/10.1039/c4py00509k.

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Methyl methacrylate was polymerized in the presence of dimanganese decacarbonyl [Mn₂(CO)₁₀]/2-cyanoprop-2-yl-1-dithionaphthalate (CPDN) via a photo-induced controlled radical polymerization under visible (green LED with λ_max of 565 nm) or sunlight irradiation at a moderate temperature.

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Hou, Wanting, Ruiqi Liu, Siwei Bi, Qian He, Haibo Wang et Jun Gu. « Photo-Responsive Polymersomes as Drug Delivery System for Potential Medical Applications ». Molecules 25, n^o 21 (5 novembre 2020) : 5147. http://dx.doi.org/10.3390/molecules25215147.

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Due to a strong retardation effect of o-nitrobenzyl ester on polymerization, it is still a great challenge to prepare amphiphilic block copolymers for polymersomes with a o-nitrobenzyl ester-based hydrophobic block. Herein, we present one such solution to prepare amphiphilic block copolymers with pure poly (o-nitrobenzyl acrylate) (PNBA) as the hydrophobic block and poly (N,N’-dimethylacrylamide) (PDMA) as the hydrophilic block using bulk reversible addition-fragmentation chain transfer (RAFT) polymerization of o-nitrobenzyl acrylate using a PDMA macro-RAFT agent. The developed amphiphilic block copolymers have a suitable hydrophobic/hydrophilic ratio and can self-assemble into photoresponsive polymersomes for co-loading hydrophobic and hydrophilic cargos into hydrophobic membranes and aqueous compartments of the polymersomes. The polymersomes demonstrate a clear photo-responsive characteristic. Exposure to light irradiation at 365 nm can trigger a photocleavage reaction of o-nitrobenzyl groups, which results in dissociation of the polymersomes with simultaneous co-release of hydrophilic and hydrophobic cargoes on demand. Therefore, these polymersomes have great potential as a smart drug delivery nanocarrier for controllable loading and releasing of hydrophilic and hydrophobic drug molecules. Moreover, taking advantage of the conditional releasing of hydrophilic and hydrophobic drugs, the drug delivery system has potential use in medical applications such as cancer therapy.

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BİLGİN, Sema, Nazan GÖKŞEN TOSUN, Cemil ALKAN, Esra KOÇ et Seçil ERDEN TAYHAN. « Activity Improvement and Thermal Stability Enhancement of D-Aminoacylase Using Protein-Polymer Conjugates ». Cumhuriyet Science Journal 43, n^o 4 (27 décembre 2022) : 621–28. http://dx.doi.org/10.17776/csj.1003429.

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In this study, the synthesis of new polymer-protein conjugates using a grafting-from strategy was performed by employing photo-induced electron transfer reversible addition-fragmentation chain transfer (PET-RAFT) polymerization. D-aminoacylase is an industrially significant enzyme for the preparation of chiral amino acids and it is coupled with reversible addition-fragmentation (RAFT) chain transfer agent (CTA) using activated ester chemistry. The effects of polymeric side chain compositions on the activity of D-aminoacylase were studied with two different polymeric side chain lengths. For this reason, two monomers, a hydrophilic N-(2-aminoethyl acrylamide) and a hydrophobic and N- (iso-butoxymethyl) acrylamide were used, respectively. It was found that modification by grafting from strategy increased the thermal stability of D-aminoacylase enzyme. Additionally, the hydrophobic monomer conjugate has been reported to increase the activity of the enzyme more than the hydrophilic monomer.

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Sivokhin, Alexey, Dmitry Orekhov, Oleg Kazantsev, Olga Sivokhina, Sergey Orekhov, Denis Kamorin, Ksenia Otopkova, Michael Smirnov et Rostislav Karpov. « Random and Diblock Thermoresponsive Oligo(ethylene glycol)-Based Copolymers Synthesized via Photo-Induced RAFT Polymerization ». Polymers 14, n^o 1 (30 décembre 2021) : 137. http://dx.doi.org/10.3390/polym14010137.

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Amphiphilic random and diblock thermoresponsive oligo(ethylene glycol)-based (co)polymers were synthesized via photoiniferter polymerization under visible light using trithiocarbonate as a chain transfer agent. The effect of solvent, light intensity and wavelength on the rate of the process was investigated. It was shown that blue and green LED light could initiate RAFT polymerization of macromonomers without an exogenous initiator at room temperature, giving bottlebrush polymers with low dispersity at sufficiently high conversions achieved in 1–2 h. The pseudo-living mechanism of polymerization and high chain-end fidelity were confirmed by successful chain extension. Thermoresponsive properties of the copolymers in aqueous solutions were studied via turbidimetry and laser light scattering. Random copolymers of methoxy- and alkoxy oligo(ethylene glycol) methacrylates of a specified length formed unimolecular micelles in water with a hydrophobic core consisting of a polymer backbone and alkyl groups and a hydrophilic oligo(ethylene glycol) shell. In contrast, the diblock copolymer formed huge multimolecular micelles.

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Huang, Xin, Dietmar Appelhans, Petr Formanek, Frank Simon et Brigitte Voit. « Synthesis of Well-Defined Photo-Cross-Linked Polymeric Nanocapsules by Surface-Initiated RAFT Polymerization ». Macromolecules 44, n^o 21 (8 novembre 2011) : 8351–60. http://dx.doi.org/10.1021/ma201982f.

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Ma, Jun, Chong Cheng et Karen L. Wooley. « The Power of RAFT for Creating Polymers Having Imbedded Side-Chain Functionalities : Norbornenyl-Functionalized Polymers and their Transformations via ROMP and Thiol-ene Reactions ». Australian Journal of Chemistry 62, n^o 11 (2009) : 1507. http://dx.doi.org/10.1071/ch09243.

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Robust, efficient and orthogonal chemistries are becoming increasingly important tools for the construction of increasingly sophisticated materials. In this article, the selectivity of reversible addition–fragmentation chain transfer (RAFT)-based radical polymerization of bifunctional monomers is exploited for the preparation of statistical and block copolymers that contain imbedded side-chain functionalities, which are then shown to exhibit two different orthogonal types of chemical reactivity to afford discrete nanoscale objects and functional derivative structures. Based on the radical reactivity ratios calculated from Alfrey–Price theory, a bifunctional monomer 4-(5′-norbornene-2′-methoxy)-2,3,5,6-tetrafluorostyrene (1) was designed and synthesized, for its highly reactive tetrafluorostyrenyl group relative to its norbornene (Nb) group. Selective RAFT copolymerization of 1 with styrene (St) afforded copolymers with over 50 mol-% structural units having a pendent norbornenyl functionality while maintaining narrow molecular weight distribution (polydispersity index (PDI) = 1.23). Diblock copolymers (PDI = 1.09–1.23) with Nb side-chain substituents regioselectively placed along one segment of the block copolymer structure were also prepared by RAFT copolymerizations of 1 with St or 2,3,4,5,6-pentafluorostyrene, using either polystyrene or poly(styrene-alt-maleic anhydride)-based macro chain-transfer agents. A well-defined star block copolymer (PDI = 1.23) having a poly(norbornene)-based core and polystyrene arms was obtained by ring-opening metathesis polymerization using the regioselective diblock copolymer PSt-b-P(1-co-St) as the multifunctional macromonomer and Grubbs’ catalyst (first generation) as the initiator. Photo-induced thiol-ene reactions of Nb-functionalized polymers with thiols were fast and efficient, yielding polymers with new side-chain structures.

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Lertturongchai, Pattida, Mohamed I. A. Ibrahim, Alain Durand, Panya Sunintaboon et Khalid Ferji. « Synthesis of Thermoresponsive Copolymers with Tunable UCST‐Type Phase Transition Using Aqueous Photo‐RAFT Polymerization ». Macromolecular Rapid Communications 41, n^o 9 (18 mars 2020) : 2000058. http://dx.doi.org/10.1002/marc.202000058.

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Tran, Thi Nga, Sandie Piogé, Laurent Fontaine et Sagrario Pascual. « Hydrogen‐Bonding UCST‐Thermosensitive Nanogels by Direct Photo‐RAFT Polymerization‐Induced Self‐Assembly in Aqueous Dispersion ». Macromolecular Rapid Communications 41, n^o 13 (5 juin 2020) : 2000203. http://dx.doi.org/10.1002/marc.202000203.

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He, Yuling, Shuwen Guo, Huangxian Ju et Ying Liu. « Photo-Cleavable Polycations-Wrapped Upconversion Nanoparticles for Efficient siRNA Delivery and Cancer Therapy ». Targets 1, n^o 1 (12 septembre 2023) : 63–78. http://dx.doi.org/10.3390/targets1010006.

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RNA interference (RNAi) therapy is a promising approach for cancer therapy. However, due to the weak binding affinity between a carrier and small interference RNA (siRNA) and complicated tumor environment, efficient loading and release of siRNA still remain challenging. Here, we design photo-cleavable polycations-wrapped upconversion nanoparticles (PC-UCNPs) for spatially and temporally controllable siRNA delivery. The PC-UCNPs are synthesized by in situ reversible addition−fragmentation chain transfer (RAFT) polymerization of photo-cleaved 5-(2-(dimethylamino)ethoxy)-2-nitrobenzyl acrylat (MENA) monomer and poly(oligo(ethylene oxide) methyl ether acrylate (OEMA) mononer through a chain transfer agent that anchored on the surface of silica-coated upconversion nanoparticles (UCNPs@SiO2). After reacting with CH3I, siRNA and hyaluronic acid (HA) are adsorbed on the particle surface to prepare PC-UCNPs/siRNA/HA. The reaction with cell-secreted hyaluronidase (HAase) achieves the intracellular delivery of PC-UCNPs/siRNA/HA, and 980 nm laser irradiation causes siRNA release, which effectively improves the gene silencing efficiency in vitro and suppresses tumor growth in vivo; therefore, these processes have a promising potential application in precision medicine.

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Xue, Yan, Dan Huang, Xinyong Wang et Chunquan Zhang. « A Study on the Dual Thermo- and pH-Responsive Behaviors of Well-Defined Star-like Block Copolymers Synthesize by Combining of RAFT Polymerization and Thiol-Ene Click Reaction ». Polymers 14, n^o 9 (21 avril 2022) : 1695. http://dx.doi.org/10.3390/polym14091695.

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A series of stimuli-responsive star-like block copolymers are synthesized via the combination of reversible addition, fragmentation chain transfer (RAFT) polymerization, and photo-initiated thiol-ene (PITE) click reaction. The controllable block ratio and block sequence, narrow distribution of molecular weight, and customized arm numbers of the star-shaped copolymers reveal the feasibility and benefits of combination of RAFT polymerization and PITE click reaction for synthesis of well-defined star-like (co)polymers. A clear insight into the relationship among the arm number, block sequence, and block ratio of the star-like block copolymers and their stimuli-responsive aggregation behavior was achieved via dynamic light scattering and UV-vis spectroscopy study. Notably, the star-like poly(acrylic acid)-b-poly(2-(dimethylamino) ethyl methacrylate) (star-PAA-b-PDMAEMA) shows higher lower critical solution temperature (LCST) compared to star-PDMAEMA-b-PAA with the same arm number and block ratio due to the inner charged PAA segments at pH > IEP. In addition, for star-like PAA-b-PDMAEMA, higher PAA content enhances the hydrophilicity of the polymer in basic solution and leads to the LCST increase, except for star-PAA1-b-PDMAEMA4 at pH = 9.0 (≈IEP). For star-PDMAEMA-b-PAA, the PAA content shows minimal effect on their LCSTs, except for the polymer in solution with pH = 9.5, which is far from their IEP. The star-like block copolymers with well-defined structure and tunable composition, especially the facile-controlled block sequence, bring us a challenging opportunity to control the stimuli-responsive properties of star-like block copolymers.

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Li, Zhuang, Jiajia Li, Xiangqiang Pan, Zhengbiao Zhang et Jian Zhu. « Catalyst-Free, Visible-Light-Induced Step-Growth Polymerization by a Photo-RAFT Single-Unit Monomer Insertion Reaction ». ACS Macro Letters 11, n^o 2 (20 janvier 2022) : 230–35. http://dx.doi.org/10.1021/acsmacrolett.1c00762.

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Zeng, Guangjian, Meiying Liu, Ruming Jiang, Qiang Huang, Long Huang, Qing Wan, Yanfeng Dai, Yuanqing Wen, Xiaoyong Zhang et Yen Wei. « Self-catalyzed photo-initiated RAFT polymerization for fabrication of fluorescent polymeric nanoparticles with aggregation-induced emission feature ». Materials Science and Engineering : C 83 (février 2018) : 154–59. http://dx.doi.org/10.1016/j.msec.2017.11.023.

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Huang, Long, Weihua Luo, Meiying Liu, Jianwen Tian, Qiang Huang, Hongye Huang, Junfeng Hui, Yuanqing Wen, Xiaoyong Zhang et Yen Wei. « Facile preparation of Eu3+ and F− co-doped luminescent hydroxyapatite polymer composites via the photo-RAFT polymerization ». Journal of the Taiwan Institute of Chemical Engineers 83 (février 2018) : 184–91. http://dx.doi.org/10.1016/j.jtice.2017.12.006.

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Allison-Logan, Stephanie, Fatemeh Karimi, Yongkang Sun, Thomas G. McKenzie, Mitchell D. Nothling, Gary Bryant et Greg G. Qiao. « Highly Living Stars via Core-First Photo-RAFT Polymerization : Exploitation for Ultra-High Molecular Weight Star Synthesis ». ACS Macro Letters 8, n^o 10 (20 septembre 2019) : 1291–95. http://dx.doi.org/10.1021/acsmacrolett.9b00643.

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Sun, Wuqiong, Xiaohua He, Xiaojuan Liao, Shaoliang Lin, Wei Huang et Meiran Xie. « Synthesis of azobenzene-containing side chain liquid crystalline diblock copolymers using RAFT polymerization and photo-responsive behavior ». Journal of Applied Polymer Science 130, n^o 3 (16 mai 2013) : 2165–75. http://dx.doi.org/10.1002/app.39407.

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Wu, Xingyu, Bryan Gross, Benjamin Leuschel, Karine Mougin, Sébastien Dominici, Simon Gree, Mehdi Belqat et al. « On‐Demand Editing of Surface Properties of Microstructures Made by 3D Direct Laser Writing via Photo‐Mediated RAFT Polymerization ». Advanced Functional Materials 32, n^o 14 (22 décembre 2021) : 2109446. http://dx.doi.org/10.1002/adfm.202109446.

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Qian, Zhuangfei, Xiaofei Huang, Na Li, Xiangqiang Pan, Jian Zhu et Xiulin Zhu. « Synthesize of large-sized porous carbon spheres with controllable N-content via spray-drying and photo-induced RAFT polymerization ». Reactive and Functional Polymers 131 (octobre 2018) : 315–25. http://dx.doi.org/10.1016/j.reactfunctpolym.2018.08.009.

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Yu, Liping, Zhengbiao Zhang, Xinrong Chen, Wei Zhang, Jianhong Wu, Zhenping Cheng, Jian Zhu et Xiulin Zhu. « Synthesis of tetrazole-containing azo polymers with properties of photo-induced birefringence and surface-relief-gratings via RAFT polymerization ». Journal of Polymer Science Part A : Polymer Chemistry 46, n^o 2 (6 décembre 2007) : 682–91. http://dx.doi.org/10.1002/pola.22416.

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Jahan, Samin, Catherine Doyle, Anupama Ghimire, Diego Combita, Jan K. Rainey, Brian D. Wagner et Marya Ahmed. « Elucidating the Role of Optical Activity of Polymers in Protein–Polymer Interactions ». Polymers 16, n^o 1 (24 décembre 2023) : 65. http://dx.doi.org/10.3390/polym16010065.

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Proteins are biomolecules with potential applications in agriculture, food sciences, pharmaceutics, biotechnology, and drug delivery. Interactions of hydrophilic and biocompatible polymers with proteins may impart proteolytic stability, improving the therapeutic effects of biomolecules and also acting as excipients for the prolonged storage of proteins under harsh conditions. The interactions of hydrophilic and stealth polymers such as poly(ethylene glycol), poly(trehalose), and zwitterionic polymers with various proteins are well studied. This study evaluates the molecular interactions of hydrophilic and optically active poly(vitamin B5 analogous methacrylamide) (poly(B5AMA)) with model proteins by fluorescence spectroscopy, nuclear magnetic resonance (NMR) spectroscopy, and circular dichroism (CD) spectroscopy analysis. The optically active hydrophilic polymers prepared using chiral monomers of R-(+)- and S-(−)-B5AMA by the photo-iniferter reversible addition fragmentation chain transfer (RAFT) polymerization showed concentration-dependent weak interactions of the polymers with bovine serum albumin and lysozyme proteins. Poly(B5AMA) also exhibited a concentration-dependent protein stabilizing effect at elevated temperatures, and no effect of the stereoisomers of polymers on protein thermal stability was observed. NMR analysis, however, showed poly(B5AMA) stereoisomer-dependent changes in the secondary structure of proteins.

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Li, Jiajia, Chunlai Ding, Zhengbiao Zhang, Jian Zhu et Xiulin Zhu. « Photo-induced reversible addition-fragmentation chain transfer (RAFT) polymerization of acrylonitrile at ambient temperature : A simple system to obtain high-molecular-weight polyacrylonitrile ». Reactive and Functional Polymers 113 (avril 2017) : 1–5. http://dx.doi.org/10.1016/j.reactfunctpolym.2017.02.003.

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Tan, Jianbo, Yuhao Bai, Xuechao Zhang, Chundong Huang, Dongdong Liu et Li Zhang. « Low-Temperature Synthesis of Thermoresponsive Diblock Copolymer Nano-Objects via Aqueous Photoinitiated Polymerization-Induced Self-Assembly (Photo-PISA) using Thermoresponsive Macro-RAFT Agents ». Macromolecular Rapid Communications 37, n^o 17 (21 juillet 2016) : 1434–40. http://dx.doi.org/10.1002/marc.201600299.

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He, Jun, Qin Xu, Jianbo Tan et Li Zhang. « Ketone-Functionalized Polymer Nano-Objects Prepared via Photoinitiated Polymerization-Induced Self-Assembly (Photo-PISA) Using a Poly(diacetone acrylamide)-Based Macro-RAFT Agent ». Macromolecular Rapid Communications 40, n^o 2 (26 juin 2018) : 1800296. http://dx.doi.org/10.1002/marc.201800296.

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Wang, Y., S. Q. Jiao, X. L. Chen et T. X. Wei. « An efficient grafting technique for producing molecularly imprinted film via reversible addition–fragmentation chain transfer polymerization ». Analytical Methods 9, n^o 36 (2017) : 5356–64. http://dx.doi.org/10.1039/c7ay01623a.

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Herein, an efficient approach towards obtaining molecularly imprinted polymer (MIP) film for the detection of 17β-estradiol (E2) with water-compatible properties using a reversible addition–fragmentation chain transfer (RAFT) via photo-initiation is described.

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Zhang, Yuxuan, Jun He, Xiaocong Dai, Liangliang Yu, Jianbo Tan et Li Zhang. « Combining the power of heat and light : temperature-programmed photoinitiated RAFT dispersion polymerization to tune polymerization-induced self-assembly ». Polymer Chemistry 10, n^o 28 (2019) : 3902–11. http://dx.doi.org/10.1039/c9py00534j.

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Li, Fanfan, Yi Yu, Hanyu Lv, Guiting Cai et Yanwu Zhang. « Synthesis of thermo-sensitive polymers with super narrow molecular weight distributions : PET-RAFT polymerization of N-isopropyl acrylamide mediated by cross-linked zinc porphyrins with high active site loadings ». Polymer Chemistry 12, n^o 15 (2021) : 2258–70. http://dx.doi.org/10.1039/d0py01643h.

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To overcome the aggregation of porphyrins and realize heterogeneous photo-catalysis with high active site loadings, twisted ZnTHP–Me₂Si and layered ZnTHP–Ph₂Si are prepared through cross-linking zinc porphyrins by different chlorosilanes.

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Lehnen, Anne-Catherine, Johannes Gurke, Alain Murhimalika Bapolisi, Martin Reifarth, Marek Bekir et Matthias Hartlieb. « Xanthate-supported photo-iniferter (XPI)-RAFT polymerization : Facile and rapid access to complex macromolecules ». Chemical Science, 2022. http://dx.doi.org/10.1039/d2sc05197d.

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Xanthate-supported photo-iniferter (XPI)-reversible addition-fragmentation chain-transfer (RAFT) polymerization is introduced as a fast and versatile photo-polymerization strategy. Small amounts of xanthate are added to conventional RAFT polymerizations to act as a...

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Hub, Lara, Joachim Koll, Maryam Radjabian et Volker Abetz. « Blue light-induced iniferter RAFT polymerization in aqueous-alcoholic media as a universal tool for the homopolymerization of various monomer families : kinetic investigations in different scales ». Polymer Chemistry, 2023. http://dx.doi.org/10.1039/d3py00241a.

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Photo-iniferter RAFT polymerization offers an opportunity to synthesize polymers without the requirements of external initiators. Blue light-induced iniferter RAFT polymerization was performed in a water-ethanol mixture (50:50 w/w) as an...

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