C-Journal of Carbon Research
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2025
·Vol. 11
·期 3
·53
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IF 2.9
Huan Liu,Yuxin Ding,Longping Zhou,Shirui Xu,Bo Liao
Carbon dots (CDs), a class of carbon-based fluorescent nanomaterials, have garnered significant attention due to their tunable optical properties and functional versatility. In this study, we developed a hybrid material by grafting pH- and temperature-responsive copolymers onto CDs via reversible addition-fragmentation chain-transfer (RAFT) polymerization. Triamino-tetraphenylethylene (ATPE) and N-isopropylacrylamide (NIPAM) were copolymerized at varying ratios and covalently linked to CDs, forming a dual-responsive system. Structural characterization using FTIR,1H NMR, and TEM confirmed the successful grafting of the copolymers onto CDs. The hybrid material exhibited pH-dependent fluorescence changes in acidic aqueous solutions, with emission shifting from 450 nm (attributed to CDs) to 500 nm (aggregation-induced emission, AIE, from ATPE) above a critical pH threshold. Solid films of the hybrid material demonstrated reversible fluorescence quenching under HCl vapor and recovery/enhancement under NH3vapor, showing excellent fatigue resistance over multiple cycles. Temperature responsiveness was attributed to the thermosensitive poly(NIPAM) segments, with fluorescence intensity increasing above 35 °C due to polymer chain collapse and ATPE aggregation. This work provides a strategy for designing multifunctional hybrid materials with potential applications in recyclable optical pH/temperature sensors.
研究领域:
材料科学
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高分子化学
·
纳米技术
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荧光传感
·
智能材料
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Science of Advanced Materials
·
2018
·Vol. 10
·期 2
·165-171
·
IF 1.318
Lan Daosong,Xiong Lei,Liang Hongbo,Zhou Jianping,Chen Liang,Wang Qiuping
A novel strategy based on grafting the comb-like copolymer brushes onto the carbon fiber (CF) surface was presented in this paper to improve the interfacial properties between the CF and epoxy matrix. The comb-like copolymer poly(4-vinylbenzyl chloride)-g-poly(glycidyl methacrylate)
(PVBC-g-PGMA) was chemically grafted onto the CF surface by combination of reversible addition-fragmentation chain transfer polymerization (RAFT) and atom transfer radical polymerization (ATRP). FT-IR, TGA, XPS and dynamic contact angles analysis demonstrate that the comb-like copolymer
brushes have been successfully grafted onto the CF surface, which can increase the surface energy and wettability of the CF with the matrix. Compressive tests show that the tensile strength, flexural strength and interfacial shear strength (IFSS) of epoxy composites reinforced by CF grafted
with PVBC-g-PGMA (CF-PVBC-g-PGMA) have been greatly improved by 39.3%, 51.9% and 143.6%, indicating that the grafting of PVBC-g-PGMA onto the CF surface can effectively enhance the mechanical and interfacial properties of epoxy composites.
研究领域:
材料科学
·
高分子化学
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Polymer Chemistry
·
2017
·Vol. 8
·期 33
·4805-4810
·
IF 5.375
Zengfang Huang,Qiaomei Chen,Qing Wan,Ke Wang,Jinying Yuan,Xiaoyong Zhang,Lei Tao,Yen Wei
Recently, amphiphilic fluorescent polymers based on aggregation-induced emission (AIE) have been attracting much attention for their application in the bioimaging field. In this study, by employing PEGMA and TPB as hydrophilic and hydrophobic segments, respectively, novel amphiphilic polymers with AIE features were successfully prepared via the combination of RAFT polymerization and the Hantzsch reaction for the first time. For the same 25% feed ratio of TPB, the molar fraction of TPB in two-step PEG-DHP1 polymers and one-pot PEG-DHP2 polymers was respectively about 20.2% and 23.5%, and their weight average molecular weights (Mn) were about 21 000 and 25 000 with a narrow PDI. From the 1H NMR analysis, the polymer structure by the one-pot method was similar to that by the two-step method. When the feed ratio was increased to 30%, the molar fraction of TPB in one-pot PEG-DHP3 polymers and the corresponding Mn respectively changed to 27.6% and 20 000. In aqueous solution, the obtained amphiphilic PEG-DHP2 polymers tended to self-assemble into fluorescent organic nanoparticles (FONs) with 100–200 nm size, whose fluorescence spectrum presented the maximal emission peak at 460 nm with the obvious AIE phenomenon. More importantly, as a result of the high water dispersibility, good fluorescence, nano morphology and excellent biocompatibility, the as-prepared polymers are attractive for application in cell imaging.
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2023
·
IF 8.2
Jiao He,Lin Yun,Xinjian Cheng
Chitosan as the plentiful and easily available natural polymer, its solubility in organic solvents is still a challenge. In this article, three different chitosan-based fluorescent co-polymers were prepared by reversible addition-fragmentation chain transfer (RAFT) polymerization. They could not only dissolve in several organic solvents, but also could selectively recognize Hg 2+ /Hg + ions. Firstly, allyl boron-dipyrrolemethene (bodipy) was prepared, and used as one of the monomers in the subsequent RAFT polymerization. Secondly, chitosan-based chain transfer agent (CS-RAFT) was synthesized through classical reactions for dithioester preparation. Finally, three methacrylic ester monomers and bodipy bearing monomers were polymerized and grafted as branched-chains onto chitosan respectively. By RAFT polymerization, three chitosan-based macromolecular fluorescent probes were prepared. These probes could be readily dissolved in DMF, THF, DCM , and acetone. All of them exhibited the ‘turn-on’ fluorescence with selective and sensitive detection for Hg 2+ /Hg + . Among them, chitosan-g-polyhexyl methacrylate-bodipy (CS-g-PHMA-BDP) had the best performance, its fluorescence intensity could be increased to 2.7 folds. In addition, CS-g-PHMA-BDP could be processed into films and coatings. When loading on the filter paper, fluorescent test paper was prepared and it could realize the portable detection of Hg 2+ /Hg + ions. These organic-soluble chitosan-based fluorescent probes could enlarge the applications of chitosan.
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PubMed
高影响因子
MACROMOLECULAR RESEARCH
·
2019
·Vol. 27
·期 11
·1144-1154
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IF 1.758
Zhou Jinsheng,Lin Yanming,Ye Lin,Wang Ling,Zhou Li,Hu Huiyuan,Zhang Qilong,Yang Hui,Luo Zhongkuan
To solve the biofouling problem of polyvinyl alcohol (PVA) hydrogel as the artificial cornea, glycidyl methacrylate (GMA) and 2-hydroxypropyltrimethyl ammonium chloride chitosan (HACC) were grafted on the surface of PVA hydrogel via a new method of photoinduced electron transfer—reversible addition fragmentation chain transfer (PET-RAFT) polymerization and ring-open reaction. Both attenuated total reflectance Fourier transform infrared spectroscopy (ATR-FTIR), X-ray photoelectron spectroscopy (XPS), atomic force microscopy (AFM), scanning electron microscope (SEM), and thermogravimetric analysis (TGA) confirmed that GMA and HACC were successfully grafted on the surface of PVA hydrogel. A series of experiments to test the hydrophilicity of PVA hydrogel showed that it became hydrophobic due to the introduction of hydrophobic groups after grafting with GMA and HACC. In addition, cytotoxicity in vitro of PVA-g-p(GMA-HACC) hydrogel could be considered as not cytotoxicity according to ISO 10993-5: 2009. The anti-fouling property of hydrogel decreased after grafting with GMA due to the hydrophobic surface, while increased after grafting with HACC due to the steric repulsion of p(GMA-HACC) polymer brush. It’s no doubt that PET-RAFT was a feasible and reliable surface modification method which could be used in many biomolecules due to the excellent advantages.
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ANALYTICA CHIMICA ACTA
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2018
·
IF 5.123
Yuanhong Xu,Tao Chen,Jing Sun,Jingquan Liu
Based on the flexible molecular engineering technique of reversible addition-fragmentation chain transfer (RAFT) polymerization, various polymers carrying positive or negative charges and different terminal groups such as pyrene or tertiary amine were synthesized for fabricating multifunctional solid-state electrochemiluminescent (ECL) sensors. Accordingly, the chemosensors immobilizing the ECL probe or co-immobilizing the ECL probe and the coreactant were realized for the quantification of small molecules (e.g., tripropylamine , tetracycline), and an aptasensor was developed for the specific and sensitive lysozyme assay (limit of detection: 0.1 ng/mL). All of the sensors were realized via a simple design exploiting the π−π stacking and electrostatic interactions . It was confirmed that the proposed strategy is simple but universal for the fabrication of versatile ECL sensors that showed simplicity, cost-effectiveness, high sensitivity, long-term stability, and excellent reproducibility.
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PubMed
高影响因子
COMPOSITES SCIENCE AND TECHNOLOGY
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2017
·
IF 4.873
Ao Xie,Yuxin Wang,Pingkai Jiang,Shengtao Li,Xingyi Huang
Interface plays a critical role in determining the electrical properties and thermal management capability of carbon (e.g., nanotubes , graphene) based polymer nanocomposites . The strong interface is usually desirable and realized by forming the covalent interaction between nanocarbon and polymer matrix . However, the pristine properties, such as high electrical and thermal conductivity , of nanocarbon are inevitably deteriorated due to the introduction of lattice defects. In this work, a nondestructive strategy, combining mussel-inspired chemistry and surface initiated reversible addition fragmentation chain transfer (RAFT) polymerization, was developed to prepare lattice defect free interface between carbon nanotubes (CNTs) and epoxy resin. Polydopamine (PDA) was first coated on the CNT surfaces and then polymethyl methacrylate (PMMA) or polyglycidyl methacrylate (PGMA) macromolecular chains were grafted onto PDA encapsulated CNTs, which can result in non-covalent or covalent interface between CNTs and epoxy resin, respectively. It was found that PGMA encapsulated CNTs based epoxy nanocomposites show apparent advantages in increasing dielectric constants and suppressing dielectric loss tangent, as well as enhancing thermal conductivity. This study proves the superiority of the covalent interface formed by nondestructive functionalization in enhancing the dielectric properties and thermal management capability of nanocarbon based polymer composites .
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Polymer Chemistry
·
2022
·Vol. 13
·期 11
·1520-1536
·
IF 5.364
Jian Sun,Yu-Lin Hong,Chang Wang,Zhi-Wei Tan,Cheng-Mei Liu
This paper reports the synthesis and selective polymerisations of an epoxy-rich phosphine oxide-containing styrenic monomer, namely 4-vinylbenzyl-bis((oxiran-2-ylmethoxy)methyl) phosphine oxide (VBzBOPO). The styryl and epoxy functionalities could be polymerized independently through free radical polymerisation or polycondensation without interference between the processes, and both resulted in reactive polymers with a high density of functional groups. In particular, reversible addition–fragmentation chain transfer polymerisation (RAFT) of VBzBOPO led to polyVBzBOPO with controlled molecular weights and narrow polydispersity (Đ = 1.13–1.23). Due to its high density of epoxy groups, polyVBzBOPO served as a precursor to a family of functionalized polymers, which were formed with a range of chemical reactions (post-polymerisation modifications) using various reagents (such as water, diethylamine, n-butanethiol and so on). Alternatively, the ring-opening polycondensation of VBzBOPO with difunctional monomers occurred via epoxy-thiol, epoxy-amine or epoxy-acid reactions that proceeded under mild conditions, and these furnished linear polymers with styryl and hydroxyl groups along the polymer chain. These polymers underwent self-crosslinking reactions at 60 °C under vacuum without any initiators, and this resulted from thermally initiated polymerisation of styrene. The water-uptake capacities of these cross-linked polymers were adjusted by changing the pH or adding a certain amount of H2O2. All the polymers were characterized in detail by Fourier transform infrared spectroscopy (FT-IR), nuclear magnetic resonance (NMR) spectroscopy and size exclusion chromatography (SEC).
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JOURNAL OF APPLIED POLYMER SCIENCE
·
2021
·Vol. 138
·期 47
·51395
·
IF 3.125
Jinsheng Zhou,Yugui Sun,Zixiang Huang,Zhongkuan Luo,Huiyuan Hu
Polyvinyl alcohol (PVA) hydrogel was modified with NIPAAm via a green, efficient, and industrially applicable photo induced electron transfer-reversible addition-fragmentation chain transfer (PET-RAFT) polymerization catalyzed by organic dye. The hydrophilicity of PVA-g-pNIPAAm became temperature sensitive due to the introduction of pNIPAAm polymer brushes. It was surprising that PVA-g-pNIPAAm became superhydrophilic (WCA = 4.3°) at 25°C while the grafting yield was 39.3%. In addition, no cytotoxic for primary human eyelid fibroblast cells was observed according to ISO 10993.5:2009. Antifouling properties of PVA-g-pNIPAAm were significantly improved due to the increase of surface steric repulsion effect. Drug release property of PVA-g-pNIPAAm was more controllable than PVA hydrogel. Thus, organic dye catalyzed PET-RAFT polymerization could be applied to construct functional surface on biomaterials, and PVA-g-pNIPAAm hydrogel with lower cytotoxic, higher antifouling, and drug release properties had great potential in drug delivery.
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Materials Chemistry Frontiers
·
2016
·Vol. 1
·期 6
·1051-1058
·
IF 0
Qing Wan,Ruming Jiang,Liucheng Mao,Dazhuang Xu,Guangjian Zeng,Yingge Shi,Fengjie Deng,Meiying Liu,Xiaoyong Zhang,Yen Wei
Multicomponent reactions (MCRs) have recently received increasing attention for the synthesis of structural complexity in a single step from three or more reactants. They have also been considered as a powerful tool for the construction of sequence-controlled multifunctional polymers owing to their good substrate adaptability, simple operation and high efficiency. In this work, we reported methods that are a combination of the three-component mercaptoacetic acid locking imine (MALI) reaction and reversible addition fragmentation chain transfer (RAFT) polymerization in one pot to form luminescent organic nanoparticles (LONs) with aggregation-induced emission (AIE) features, high-brightness, great water dispersibility, ultra-small nanoscale size and excellent biocompatibility. In the reaction system, the MALI reaction and RAFT polymerization happened simultaneously in a “one-pot” route. On the one hand, the AIE-active organic dye with one amino group ((Z)-3-(4-aminophenyl)-2-(10-hexadecyl-10H-phenothiazin-3-yl)acrylonitrile) (named as Phe-NH2) was conjugated with an aldehyde-containing monomer (10-undecenal) by the MALI reaction, while the aldehyde-containing monomer was copolymerized with the hydrophilic monomer polyethylene glycol methyl methacrylate (PEGMA) through RAFT polymerization at the same time. Compared with other fabrication strategies, “one-pot” strategies possess some advantages such as high efficiency, simplicity, and atom economy. On the other hand, due to the good applicability of RAFT polymerization and the MALI reaction, many other multifunctional AIE-active LONs could also be fabricated via adjusting the function of the substrates. Therefore, this strategy should be a general and important route for fabrication of AIE-active materials for different applications.
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POLYMER
·
2015
·
IF 3.562
Huanhuan Liu,Xiao Jiang,Rongjian Bian,Min Tong,Dandan Tang,Xiangdong Zhou,Youliang Zhao
Controlled synthesis of A 2m B 2n -type (m ≈ n ≈ 8) starlike copolymers comprising an oligomeric poly(styrene- co -maleimide) core and two types of V-shaped arms individually generated by ATRP and ROP was described. Multistep syntheses involving RAFT copolymerization , end group removal, ATRP of vinyl monomers such as styrene (St), methoxyethyl methacrylate (MEMA) and tert -butyl acrylate ( t BA), and ROP of ε -caprolactone (CL) were used to construct the target miktoarm stars with controlled molecular weight and relatively low polydispersity (PDI = 1.07–1.22). The resultant star copolymers had high bromide functionality and uniform chain length of ATRP-generated arms, evident from chain extension polymerization and cleavage of arms. Meanwhile, a pH-responsive (PAA) 2m (PCL) 2n star was also obtained by selective hydrolysis. The synthetic strategy via combination of RAFT copolymerization and “core first” approach is versatile in constructing various A 2m B 2n stars, and this study further paves way for facile synthesis and properties of new types of miktoarm stars.
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2025
·
IF 9
Xiaoyang Liu,Na Zhang,Zhen Dong,Jifu Du,Lifang Peng,Long Zhao,Miao Yang
Technetium ( 99 Tc) is a main long-lived radionuclide of nuclear waste, which poses a great threat to the environment and human health. The reasonable disposal of 99 Tc is vital important. In this paper, a series of novel materials (SMILR m , m = 0, 1/500, 1/200, m is the molar ratio of IL to RAFT reagent) was synthesized by radiation-induced grafting combined with reversible addition-fragmentation chain transfer (RAFT) polymerization. The adsorption performance of SMILR m to 99 Tc were investigated. The graft polymerization process is controlled by the RAFT reagent, resulting in a restricted dispersion of SMILR m molecular weight. With the increase of RAFT reagent content, the grafting yield (GY) decreased. The addition of RAFT reagent increases the specific surface area of the adsorbent, accelerates the adsorption rate, increases the adsorption capacity, but reduces the adsorption selectivity. Especially, the adsorption of SMILR 0 was a single step adsorption and obeyed Langmuir adsorption model, while SMILR m (1/500, 1/200) showed a stepwise adsorption isotherm model. SMILR m exhibited excellent recyclability and could efficiently capture Re O 4 - from a simulated Beishan groundwater in dynamic experiments. Finally, XPS and FT-IR analysis confirmed that the adsorption was an ion exchange mechanism. The results showed that SMILR m are suitable for the effective removal of Re O 4 - / T c O 4 - from radioactive wastewater with complex composition.
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