Photoinitiated Polymerization Research Articles

Carbazole-fused coumarin bis oxime esters (CCOBOEs) as efficient photoinitiators of polymerization for 3D printing with 405 nm LED

In this research, the innovative design and successful synthesis of two visible light photoinitiators, namely CCOBOE0 and CCOBOE1, have been confirmed through nuclear magnetic resonance (NMR) and mass spectrometry (MS). Both compounds exhibit strong absorption properties at 385, 405 and 450 nm, and FT-IR analyses have substantiated the ability of CCOBOE1 to initiate the polymerization of a trifunctional acrylate monomer (TMPTA) under these three light sources. The optimal conditions for maximizing the photoinitiation potential of CCOBOE1 were determined to be at a concentration of 2 × 10−5 mol.g−1 and under 405 nm LED irradiation. Photolysis experiments, theoretical calculations, detection of CO2 absorption peaks, and ESR experiments have all confirmed the generation of methyl radicals by CCOBOE1. Utilizing the identified optimal conditions, a “XYZ” pattern with a thickness of 963 μm and a 3D-object were successfully obtained via direct laser write (DLW) and digital light processing (DLP) 3D-printing upon irradiation at 405 nm. Additionally, differential scanning calorimetry (DSC) analyses demonstrated the promising performance of CCOBOE1 in initiating the thermal polymerization of acrylate monomers. In summary, the difunctional CCOBOE1 showed outstanding performance in both photo-initiation and thermal initiation of acrylate monomers. It provides a novel direction for the development of novel OXEs with dual activation modes.

Injectable hemostatic hydrogel adhesive with antioxidant, antibacterial and procoagulant properties for hemorrhage wound management

In emergencies, uncontrolled severe bleeding can result in undesired complications and even death of the injured. Designing advanced hemostatic agents is a potential solution for emergency hemostasis, yet it remains challenging to realize the persistent adhesion in a wet wound environment. In this study, based on dynamic reversible Schiff base bond and photo-initiated double-bond polymerization, a novel injectable hemostatic hydrogel (L-COC) consisting of methacrylated carboxymethyl chitosan (CMCSMA), oxidized konjac glucomannan (OKGM) and (+)-catechin hydrate (CH) was synthesized for emergency hemostasis. To our delight, the incorporated CH imparted enhanced blood procoagulantion to the L-COC hydrogel by intensifying the hydrogel-red blood cell interactions. As a result, the hemostatic effect of the engineered L-COC hydrogel was significantly superior to that of fluid gelatin SurgifloTM for liver bleeding wounds in rats (Blood loss: 0.62 ± 0.11 g (L-COC), 0.90 ± 0.08 g (SurgifloTM); hemostasis time: 69.0 ± 2.9 s (L-COC), 84.0 ± 2.2 s (SurgifloTM)). With the favorable antioxidant and antibacterial activities, as well as multifunctional properties, the bio-adhesive L-COC hydrogel and the underlying design principles may facilitate further development of practical hemostatic hydrogels.

Liquid metal nanoparticles as photo-initiators for preparation of transparent hydrogel with adjustable mechanical properties

To achieve rapid preparation of hydrogels without using conventional chemical initiators, a stable suspension of eutectic gallium indium (EGaIn) liquid metal nanoparticles is explored by probe-sonicating the metal in an aqueous solution. Liquid metal suspension was sonicated to serve as a photo-initiator for acrylamide polymerization and produce hydrogels. The initiation effect comes from the fact that liquid metal suspension after sonication can produce a large number of free radicals when exposed to ultraviolet (UV) radiation, leading to initiation. The changes of liquid metal nanodroplets under UV light irradiation have been systematically investigated. Further, the liquid metal colloidal solutions were used to prepare hydrogels with the same transparency and adjustable mechanical properties as the samples initiated by commercial photo-initiators. This work shows the great application potential of liquid metal in the preparation of hydrogels and provides a new technical idea for the design of multifunctional hydrogels.

Developing a sustainable resin for 3D printing in coral restoration

Coral reefs boast one of the planet’s most diversified ecosystems, serving as an essential source of food and revenue for millions of people while providing shelter to a wide variety of marine creatures. However, overfishing, pollution, climate change, and other factors collectively pose an escalating danger to coral reefs. Therefore, coral reef restoration efforts are urgently needed to save corals. In this study, we exploited 3D printing technology based on vat polymerization to fabricate artificial coral plugs, expediting the reef restoration process while minimizing labor costs. We have developed a scalable model through the photoinitiated polymerization of an eco-friendly resin composed of modified soybean oil and calcium carbonate which has the potential to significantly enhance global restoration efforts. Material characterization demonstrated that the printed scaffold was highly cross-linked. Based on cytotoxicity analysis, the printed scaffold exhibited excellent cell adhesion and proliferation characteristics. The coral microfragmentation experiment showed initial signs of coral settlement on the printed coral plugs. This work demonstrates that plant-based material and vat-polymerization-based 3D printing techniques hold promise for coral restoration.

Constructing liquid crystalline elastomer multi-fold gratings with side-on epoxy liquid crystalline monomers

ABSTRACT The fabrication of liquid crystalline elastomer (LCE) with reversible deformation is promising for development of intelligent materials and equipment. Preparing new liquid crystalline monomer (LCM) and developing novel LCE structures are crucial for the fabrication of advanced LCE. Herein, we design and synthesis a series of side-on nematic epoxy LCM, and then fabricate corresponding LCE with micropillar array via photoinitiated polymerisation of a magnetic induced oriented LCMs with soft lithography patterned structures. 1H NMR, 13C NMR, COSY, FTIR and MS spectra confirm the structures of the LCMs. DSC and POM results demonstrate that the LCMs are nematic liquid crystals. SEM, OM, and POM observations indicate the successful fabrication of LCE micropillars that exhibit reversible contraction and extension during heating and cooling cycles. In addition, the thermal induced reversible deformation of the LCE micropillars is closely related to the structure of the LCM. By using the same method, functional LCE with multi-fold gratings are prepared by using the multi-fold gratings master mask during the fabrication process, providing a material foundation for the construction of intelligent surfaces that can selectively diffract light under external thermal stimuli.

Bionic double-crosslinked hydrogel of poly (γ-glutamic acid)/poly (N-(2-hydroxyethyl) acrylamide) with ultrafast gelling process and ultrahigh burst pressure for emergency rescue

Injectable adhesive hydrogels combining rapid gelling with robust adhesion to wet tissues are highly required for fast hemostasis in surgical and major trauma scenarios. Inspired by the cross-linking mechanism of mussel adhesion proteins, we developed a bionic double-crosslinked (BDC) hydrogel of poly (γ-glutamic acid) (PGA)/poly (N-(2-hydroxyethyl) acrylamide) (PHEA) fabricated through a combination of photo-initiated radical polymerization and hydrogen bonding cross-linking. The BDC hydrogel exhibited an ultrafast gelling process within 1 s. Its maximum adhesion strength to wet porcine skin reached 254.5 kPa (9 times higher than that of cyanoacrylate (CA) glue) and could withstand an ultrahigh burst pressure of 626.4 mmHg (24 times higher than that of CA glue). Notably, the BDC hydrogel could stop bleeding within 10 s from a rat liver incision 10 mm long and 5 mm deep. The wound treated with the BDC hydrogel healed faster than the control groups, underlining the potential for emergency rescue and wound care scenarios.

2-Methyl-4'-(methylthio)-2-morpholinopropiophenone: A commercial photoinitiator being used as a new psychoactive substance

Synthetic cathinones, which are novel psychoactive substances, have caused major social problems worldwide. A substance called 2-methyl-4′-(methylthio)-2-morpholinopropiophenone (MMMP), which is employed as a commercial industrial photoinitiator for triggering polymerization, has a basic cathinone backbone; however, few reports regarding MMMP have been published. In the current study, three potential metabolites of MMMP—namely hydroxy-MMMP (HO-MMMP), HO-MMMP-sulfoxide (HO-MMMP-SO), and HO-MMMP-sulfone (HO-MMMP-SO2)—were successfully synthesized, and MMMP and these three potential metabolites were used as standards to establish an analytic method based on liquid chromatography–tandem mass spectrometry for the quantitative analysis of urine. This analytic method and related parameters—including dynamic range, limit of quantification, selectivity, precision, accuracy, carryover effect, matrix effect, interference, and dilution integrity—were optimized and validated. Forty urine samples from 1,691 individuals who abused drugs were determined to contain MMMP, HO-MMMP, HO-MMMP-SO, or HO-MMMP-SO2; the results of this study indicate that approximately 2.37 % of drug abusers in Taiwan consumed MMMP in 2023. These 40 urine samples were analyzed to investigate the metabolism of MMMP in humans. The results indicate that HO-MMMP-SO is the main metabolite in human urine. This study recommends HO-MMMP-SO with a concentration of 2 ng/mL as a target and cutoff value, respectively, for identifying individuals who have consumed MMMP.

Highly sensitive l-lysine molecularly imprinted two-dimensional photonic crystal hydrogel sensor

Using polystyrene two-dimensional photonic crystal as template, l-lysine molecularly imprinted two-dimensional photonic crystal hydrogel (l-Lys MIPCH) sensor with highly sensitive response to l-lysine was prepared by photoinitiated polymerization. The response performance of the l-Lys MIPCH sensor was investigated by observing the change of the diameter of the Debye ring (ΔD) and the structural color of the sensor. In the process of recognizing l-Lys molecules by l-Lys MIPCH sensor, the volume of hydrogel swells, the diameter of Debye ring decreases, and the particle spacing of photonic crystal increases. As the l-Lys concentration increased from 0 to 10−4 mol/L, the diameter of Debye ring decreased by 15.7 mm, the particle spacing of photonic crystals increased by 75.1 mm, and the structural color of hydrogel changed from blue to red correspondingly. When the l-Lys concentration was in the range of 10−12–10−4 mol/L, there was a linear relationship between the change in the diameter of the Debye ring (ΔD) and the logarithm value of the l-Lys concentration (lgc), and the linear relationship was as follows: ΔD = 19.04 + 0.90 lgc, R 2=0.9962. In addition, the detection limit of the sensor is as low as 10−16 mol/L. The prepared sensor not only has high selectivity, but also can be used for chiral recognition of l-Lys, and the results of l-Lys in the actual sample of lysiinositol vitamin B12 oral solution were also satisfactory.

Synthesis and photoinitiated cationic polymerization of epoxy monomers derived from oleic acid comprising one to three epoxy groups

A series of bio-based epoxy compounds based on oleic acid combined with aliphatic or aromatic structures were studied regarding selected properties such as melting behavior and viscosity as well as their reactivity in a photoinitiated cationic polymerization. The new epoxy compounds derived from oleic acid and either eugenol or isoeugenol, epoxidized triolein, and an epoxy compound derived from oleic acid and popane diol-1,3 contain 100 % renewable carbon. Atom economy differs not only for the esterification and epoxidation reaction, also selection of hydrogen peroxide or m-chloroperbenzoic acid for the epoxidation significantly influences the atom economy of this reaction step. Variation of the chemical structure of the bio-based epoxy compounds derived from oleic acid and either an aliphatic alcohol or a phenolic compound results in differences in both melting behavior and viscosity of the epoxy monomers that is important for the photoinitiated cationic polymerization. Kinetic investigation of the photoinitiated cationic polymerization of the bio-based epoxy compounds using photo-DSC shows significant differences in the polymerization rate and conversion as a function of the irradiation time for the epoxy monomers. RT-FTIR spectroscopy gives additional information about the polymerization kinetics for epoxy monomers that are liquid at room temperature. The glass transition temperature of the photopolymers analyzed by DSC is mostly below room temperature that is attributed to the high content of flexible structures containing in the polymers. Additional investigation of the soluble photopolymers by GPC resulted in a molecular weight corresponding to the oligomer region and a dispersity higher than one. The bio-based epoxy monomers comprising two or three epoxy groups may be interesting for application, e. g. in coatings or adhesives, because photoinitiated polymerization results in crosslinking. Epoxy compounds containing only one epoxy group may be useful for viscosity reduction of the photopolymerizing mixtures because of their lower viscosity compared to the epoxy monomers comprising more than one epoxy group.

Photoredox dual catalysis using stimulus-responsive fluoresceins for colorimetric detection of Hg(II) ions

We demonstrate photoredox dual catalysis using fluorescein derivatives and apply it to polymerization-based signal amplification (PBA) under the irradiation of visible light. The mechanism of the photoredox dual catalysis is elucidated using electron paramagnetic resonance (EPR) and UV–Vis spectroscopies. We applied the photoredox dual catalysis to amplify and readout the signal of Hg(II) ions with the unaided eye through photoinitiated free-radical polymerization. Although PBA offers a reliable and rapid colorimetric method for analyte detection, its sensitivity remains a challenge compared with fluorescence detection. To address this issue, we designed a dual system involving activatable fluoresceins that selectively react to external stimuli, followed by their action as photoredox catalysts/initiators. As a proof-of-concept, we employed fluorescin (rFL) and eosin hydrazide (EYHZ) as light- and Hg(II) ion-responsive probes, respectively. This dual system selectively initiated the polymerization of poly(ethylene glycol) diacrylate (PEGDA) in the presence of Hg(II) ions under visible light. Remarkably, this photoredox dual catalysis approach allowed the unaided eye to detect of Hg(II) ions as low as 90 nM in aqueous solution, demonstrating its potential for sensitive and versatile sensing applications.

Photo‐controllable cationic homopolymerization and random copolymerization of vinyl ethers based on iridium salt photocatalyst

AbstractTemporal control of chain growth is a central challenge for photoinitiated active polymerization. In this work, we introduced an iridium salt complex‐based catalyst system to achieve fine temporal control of the chain growth process. By electrochemical analysis, compared with the pyran salt photocatalyst, it was found that the iridium salt complex could promote the chain transfer of active species to reversible addition‐fragmentation chain transfer polymerization (RAFT) reagent, thereby generating dormant species, which provided the possibility of time control of the polymerization process. Using this catalytic system, we successfully achieved homopolymerization of vinyl ethers with different substituents and random copolymerization with isobutyl vinyl ethers, which is not only pointed the way for broadening the monomer selection in the future, but also provided an innovative way to prepare new functionalized materials.

Visible light radical photoinitiators of polymerization based on photochromic molecules

A series of photochromic compounds linked to a benzophenone nucleus were synthetized and evaluated regarding their ability to act as Norrish type II radical photoinitiators, promoting the polymerization of a polyacrylate monomer after the consecutive absorption of LED UV and Vis light.

Synthesis and photo‐initiated radical polymerization of methacrylates derived from bio‐based ω‐hydroxycarboxylic acids

AbstractThe bio‐based methacrylates 9‐(methacryloyloxy)‐10,18‐dihydroxyoctadecanoic acid/9,18‐dihydroxy‐10‐(methacryloyloxy)octadecanoic acid isomer mixture and 22‐methacryloyloxydocosanoic acid were synthesized from 9,10‐epoxy‐18‐hydroxyoctadecanoic acid and 22‐hydroxydocosanoic acid. The white crystalline 9,10‐epoxy‐18‐hydroxyoctadecanoic acid and cream‐colored 22‐hydroxydocosanoic acid were isolated from both the bark of Betula pendula and cork of Quercus suber after extraction of the milled plant materials with methanol, treating the insoluble residues with 2‐propanole containing suspended sodium hydroxide, application of a working up procedure developed in this work for the resulting mixture, and purification of the products obtained. The new bio‐based methacrylates show higher reactivity in the photoinitiated polymerization in comparison with the commercial laurylmethacrylate as detected by photo‐differential scanning calorimetry (DSC). For comparison, traditional free radical polymerization of the new bio‐based methacrylates was carried out in dimethylsulfoxide using 2,2'‐azobis‐(2‐propionitrile) as initiator. Furthermore, the quantitative conversion of the bio‐based monomers during the photoinitiated polymerization makes these bio‐based monomers interesting for application in coatings. As expected, the photopolymer made from the 9‐(methacryloyloxy)‐10,18‐dihydroxyoctadecanoic acid/9,18‐dihydroxy‐10‐(methacryloyloxy)octadecanoic acid isomer mixture is amorphous. Interestingly, the photopolymer made from the 22‐methacryloyloxydocosanoic acid contains crystalline structures as detected by DSC investigation.

Rational design of biomass-derived and UV-curable dynamic polymer for the encapsulation of paper-based flexible strain sensor

The paper-based flexible electronic devices with the virtues of light weight, porousness, sustainability and low cost by paper-making technology, however its application may be restricted by the poor tolerance of water due to the abundance of hydroxyl group of cellulose fibers. The encapsulation of such device requires to keep its sustainability and match the high efficiency of paper-making industry. In this work, a series of biomass-derived and UV-curable dynamic polymers were synthesized using itaconic acid and binary alcohols as raw materials. The diglycidyl ethers were firstly synthesized through the substitution reaction between binary alcohols and epichlorohydrin. The oligomer was then prepared by ring-opening reactions between the diglycidyl ethers and glycidyl-methacrylate-modified itaconic acid precursor. The dynamic polymers were finally obtained from photo-initiated polymerization, of which the mechanical property was regulated by the length of the binary alcohols. It is found that the polymer from 1,10-decanol possessed the highest tensile strength of 5.8 MPa and biggest elongation at break of 4.1%. The polymer can be self-healed and recycled, and was proved to be used as a photoresist for printed circuit board (PCB). Furthermore, the polymer was successfully applied to encapsulation of paper-based flexible strain sensor, which exhibited hydrophobicity and significantly higher working stability under high humidity or human sweating condition. The strategy reported in this work may pave a way for the development of sustainable thermosetting polymers and sustainable flexible electronic devices with high performance.

Light-mediated intracellular polymerization.

The synthesis of synthetic intracellular polymers offers groundbreaking possibilities in cellular biology and medical research, allowing for novel experiments in drug delivery, bioimaging and targeted cancer therapies. These macromolecules, composed of biocompatible monomers, are pivotal in manipulating cellular functions and pathways due to their bioavailability, cytocompatibility and distinct chemical properties. This protocol details two innovative methods for intracellular polymerization. The first one uses 2-hydroxy-4'-(2-hydroxyethoxy)-2-methylpropiophenone (Irgacure 2959) as a photoinitiator for free radical polymerization under UV light (365 nm, 5 mW/cm2). The second method employs photoinduced electron transfer-reversible addition-fragmentation chain-transfer polymerization with visible light (470 nm, 100 mW/cm2). We further elaborate on isolating these intracellular polymers by streptavidin/biotin interaction or immobilized metal ion affinity chromatography for polymers tagged with biotin or histidine. The entire process, from polymerization to isolation, takes ~48 h. Moreover, the intracellular polymers thus generated demonstrate significant potential in enhancing actin polymerization, in bioimaging applications and as a novel avenue in cancer treatment strategies. The protocol extends to animal models, providing a comprehensive approach from cellular to systemic applications. Users are advised to have a basic understanding of organic synthesis and cell biology techniques.

An electrochemical biosensor for the amplification of thrombin activity by perylene-mediated photoinitiated polymerization

BackgroundThrombin, a coagulation system protease, is a key enzyme involved in the coagulation cascade and has been developed as a marker for coagulation disorders. However, the methods developed in recent years have the disadvantages of complex operation, long reaction time, low specificity and sensitivity. Meanwhile, thrombin is at a lower level in the pre-disease period. Therefore, to accurately diagnose the disease, it is necessary to develop a fast, simple, highly sensitive and specific method using signal amplification technology. ResultsWe designed an electrochemical biosensor based on photocatalytic atom transfer radical polymerization (photo-ATRP) signal amplification for the detection of thrombin. Sulfhydryl substrate peptides (without carboxyl groups) are self-assembled to the gold electrode surface via Au–S bond and serve as thrombin recognition probes. The substrate peptide is cleaved in the presence of thrombin to generate –COOH, which can form a carboxylate-Zr(IV)-carboxylate complex via Zr(IV) and initiator (α-bromophenylacetic acid, BPAA). Subsequently, an electrochemical biosensor was prepared by introducing polymer chains with electrochemical signaling molecules (ferrocene, Fc) onto the electrode surface by photocatalytic (perylene, Py) mediated ATRP using ferrocenylmethyl methacrylate (FMMA) as a monomer. The concentration of thrombin was evaluated by the voltammetric signal generated by square wave voltammetry (SWV), and the result showed that the biosensor was linear between 1.0 ng/mL ∼ 10 fg/mL, with a lower detection limit of 4.0 fg/mL (∼0.1 fM). Moreover, it was shown to be highly selective for thrombin activity in complex serum samples and for thrombin inhibition screening. SignificanceThe biosensor is an environmentally friendly and economically efficient strategy while maintaining the advantages of high sensitivity, anti-interference, good stability and simplicity of operation, which has great potential for application in the analysis of complex samples.

Ion-Selective Potentiometry with Plasma-Initiated Covalent Attachment of Sensing Membranes onto Inert Polymeric Substrates and Carbon Solid Contacts.

The physical delamination of the sensing membrane from underlying electrode bodies and electron conductors limits sensor lifetimes and long-term monitoring with ion-selective electrodes (ISEs). To address this problem, we developed two plasma-initiated graft polymerization methods that attach ionophore-doped polymethacrylate sensing membranes covalently to high-surface-area carbons that serve as the conducting solid contact as well as to polypropylene, poly(ethylene-co-tetrafluoroethylene), and polyurethane as the inert polymeric electrode body materials. The first strategy consists of depositing the precursor solution for the preparation of the sensing membranes onto the platform substrates with the solid contact carbon, followed by exposure to an argon plasma, which results in surface-grafting of the in situ polymerized sensing membrane. Using the second strategy, the polymeric platform substrate is pretreated with argon plasma and subsequently exposed to ambient oxygen, forming hydroperoxide groups on the surface. Those functionalities are then used for the initiation of photoinitiated graft polymerization of the sensing membrane. Attenuated total reflection-Fourier transform infrared spectroscopy, water contact angle measurements, and delamination tests confirm the covalent attachment of the in situ polymerized sensing membranes onto the polymeric substrates. Using membrane precursor solutions comprising, in addition to decyl methacrylate and a cross-linker, also 2-(diisopropylamino)ethyl methacrylate as a covalently attachable H+ ionophore and tetrakis(pentafluorophenyl)borate as ionic sites, both plasma-based fabrication methods produced electrodes that responded to pH in a Nernstian fashion, with the high selectivity expected for ionophore-based ISEs.

Novel High-Performance Glyoxylate Derivative-Based Photoinitiators for Free Radical Photopolymerization and 3D Printing with Visible LED.

Investigations concerning the glyoxylate moiety as a photocleavable functional group for visible light photoinitiators, particularly in the initiation of free radical photopolymerization remain limited. This study introduces nine innovative carbazole-based ethyl glyoxylate derivatives (CEGs), which are synthesized and found to exhibit excellent photoinitiation abilities as monocomponent photoinitiating systems. Notably, these structures demonstrate robust absorption in the near-UV/visible range, surpassing the commercial photoinitiators. Moreover, the newly developed glyoxylate derivatives show higher acrylate function conversions compared to a benchmark photoinitiator (MBF) in free radical photopolymerization. Elucidation of the photoinitiation mechanism of CEGs is achieved through a comprehensive analysis involving the decarboxylation reaction and electron spin resonance spin trapping. Furthermore, their practical utility is confirmed during direct laser writing and 3D printing processes, enabling the successful fabrication of 3D printed objects. This study introduces pioneering concepts and effective strategies in the molecular design of novel photoinitiators, showcasing their potential for highly advantageous applications in 3D printing.

Triblock polymer PDMAEMA-co-PNIPAM-co-PMPC to deliver siKRAS for gene therapy in pancreatic cancer

Mutant KRAS sustained KRAS-GTP conformation and activated downstream signaling in pancreatic cancer. Inhibition of KRAS expression has been widely utilized for gene therapy of pancreatic cancer. In this study, a triblock cationic polymer, PDMAEMA-co-PNIPAM-co-PMPC (PDNM), was designed and synthesized as a gene carrier through photoinitiated free radical polymerization. The PDNM/siKRAS delivery system exhibited efficient cellular uptake and low bio-toxicity, as confirmed by fluorescence microscopy and flow cytometry. In vitro experiments using AsPC-1 cells showed that the nanoparticle transfection with PDNM/siKRAS demonstrated favorable anti-tumor effect, including enhanced apoptosis, inhibition of mitosis by arresting the cell cycle at the S phase, reduced Ki67 expression, and impaired cell migration ability. The anti-tumor effect was achieved primarily through KRAS inhibition and caspase 3 activation following siKRAS transfection. Additionally, in vivo experiments showed that the PDNM/siKRAS nanoparticles resulted in reduced tumor volumes and decreased Ki67 expression without apparent impairment of other organs. Notably, the transfection of nanoparticles in patient-derived organoids also demonstrated a similar inhibitory effect. Overall, PDNM holds promise as a potential carrier for siKRAS delivery and gene therapy, both in experimental and clinical applications.

Cationic UV-cured epoxy coating with inhibitor-loaded nanoparticles: photoinitiated cationic polymerization, mechanical properties and corrosion protection of steel

Cationic UV-cured epoxy coating with inhibitor-loaded nanoparticles: photoinitiated cationic polymerization, mechanical properties and corrosion protection of steel