Cationic Monomer Research Articles

Multiple healing flexible zinc-ion battery based on double cross-linked polyampholyte hydrogel electrolyte

Flexible and multifunctional zinc-ion batteries (ZIBs) play an important role in flexible and wearable electronics. However, traditional polyvinyl alcohol-based gel electrolytes have inherent limitations in terms of healability and stretchability, which cannot fully meet the requirements of flexible, healable, and multifunctional ZIBs. Herein, polyampholyte nanocomposite hydrogels are synthesized via in-situ co-polymerization of the anionic monomer sodium p-styrenesulfonate and the cationic monomer methacrylatoethyl trimethyl ammonium chloride in the presence of inorganic crosslinkers graphene oxide (GO) and Laponite. The hydrogels demonstrate high mechanical performance, excellent ionic conductivity (27.3 mS cm−1), and superior multiple healable performance due to the presence of inorganic crosslinkers such as Laponite and GO, as well as zwitterionic monomers. The as-prepared ZIBs based on polyampholyte hydrogel electrolyte are assembled using carbon nanotubes (CNTs)/vanadium disulfide as cathode and CNTs/Zn as anode. The resulting ZIBs possess excellent electrochemical properties (245 mAh g−1 at 0.05 A g−1) and multifunctional healability under ambient temperature, near infrared light with 808 nm and heating conditions, respectively. More significantly, the broken/healed ZIBs exhibit superior flexibility and six broken/healing cyclic stability. The polyampholyte nanocomposite hydrogel electrolytes extend the application of flexible energy storage devices to other portable and wearable energy related devices with multifunctionality.

Toughening Weak Polyampholyte Hydrogels with Weak Chain Entanglements via a Secondary Equilibrium Approach.

Polyampholyte (PA) hydrogels are randomly copolymerized from anionic and cationic monomers, showing good mechanical properties owing to the existence of numerous ionic bonds in the networks. However, relatively tough PA gels can be synthesized successfully only at high monomer concentrations (CM), where relatively strong chain entanglements exist to stabilize the primary supramolecular networks. This study aims to toughen weak PA gels with relatively weak primary topological entanglements (at relatively low CM) via a secondary equilibrium approach. According to this approach, an as-prepared PA gel is first dialyzed in a FeCl3 solution to reach a swelling equilibrium and then dialyzed in sufficient deionized water to remove excess free ions to achieve a new equilibrium, resulting in the modified PA gels. It is proved that the modified PA gels are eventually constructed by both ionic and metal coordination bonds, which could synergistically enhance the chain interactions and enable the network toughening. Systematic studies indicate that both CM and FeCl3 concentration (CFeCl3) influence the enhancement effectiveness of the modified PA gels, although all the gels could be dramatically enhanced. The mechanical properties of the modified PA gel could be optimized at CM = 2.0 M and CFeCl3 = 0.3 M, where the Young's modulus, tensile fracture strength, and work of tension are improved by 1800%, 600%, and 820%, respectively, comparing to these of the original PA gel. By selecting a different PA gel system and diverse metal ions (i.e., Al3+, Mg2+, Ca2+), we further prove that the proposed approach is generally appliable. A theoretical model is used to understand the toughening mechanism. This work well extends the simple yet general approach for the toughening of weak PA gels with relatively weak chain entanglements.

Preparation and properties of a double quaternary ammonium copolymer used in acid fracturing

Triethylamine (TEA), 1, 4-dibromobutane (C 4 H 8 Br 2 ) and N, N -dimethylaminopropyl acrylamide (DMAPAA) were selected to synthesize a double quaternary ammonium cationic monomer (TDD). TDD, acrylamide (AM), 2-acrylamido-2-methylpropane sulfonic acid (AMPS) and acrylic acid (AA) were used to create a quadripolymer (PAAT) that was characterized by FT-IR and 1 H NMR. Following that, the basic performance of thickened acid was assessed. The results revealed that PAAT outperformed PAA (copolymerized by AM, AMPS and AA) in terms of acid solubility, thickening performance, temperature resistance and shear resistance. Furthermore, this crosslinked acid containing PAAT was subjected to a series of performance evaluations. The viscosity of the crosslinked acid could be kept at 67 mPa·s at 160°C after 90 min and the weight loss rate of crosslinked acid in acid-rock reaction at 60 min was 23%, indicating the temperature resistance and retarder performance of the crosslinked acid solution was significantly better than that of the thickening acid and the blank acid. A scanning electron microscopy experiment revealed that crosslinked acid has good corrosion ability and low damage to the reservoir. The above experimental results indicated that the thickener PAAT has a promising future application in acid fracturing of high-temperature and high-mineralization carbonate reservoirs.

The Influence of Amphoteric Terpolymerization of Poly (N-Isopropylacrylamide) in the Optimization of the Phase Separation Temperatures

The aim of this study is to fabricate an ampholyte thermo-responsive terpolymers and explore the influence of ampholyte on the phase separation temperatures in different pH solutions. The fabrication of the ampholyte thermo-responsive terpolymers was achieved by terpolymerization of N-isopropylacrylamide (NIPAAm), DIVA (5, 10, and 15 mol.%), and acrylic acid (AA) 10 mol.%. The preparation of the cationic monomer from vanillin was achieved in a facile reaction named 2-((diisopropylamino) methyl)-4-formyl-6-methoxyphenyl acrylate (DIVA). The chemical structures of the monomers and terpolymers were evaluated successfully by 1H, 13C NMR, and FTIR. The average molecular weight and dispersity of the terpolymers were characterized using gel permeation chromatography (GPC); the glass transition temperature, crystallinity, and morphology were characterized using DSC, XRD, and SEM, respectively. The hydrophilic/hydrophobic properties of the fabricated terpolymers, at different pH conditions, were evaluated using contact angle measurements. The lower critical solution temperature (LCST) for all samples was measured using UV–vis spectrophotometer. Moreover, the LCST was tested using different Hofmeister salts in kosmotropic and chaotropic conditions. The findings of this study can be utilized in the bio-separation of biological molecules, as well as drug delivery applications.Graphical

Effect of substitution groups on the homopolymerization activity of methyl aryl diallyl ammonium chloride

AbstractDimethyl diallyl ammonium chloride (DMDAAC), recognized for its high positive charge density among the several diallyl quaternary ammonium cationic monomers, has been constrained in lipophilic applications by its structure. In this article, benzyl, p‐methylbenzyl, and p‐nitrobenzyl were introduced as structural modifications of DMDAAC to compensate for this. The effects of the introduced aryl structures on the molecular structure of the modified diallyl methyl aryl ammonium chloride and the polymerization activity of the monomers were explored by quantum chemical calculations and homopolymerization kinetic studies with ammonium persulfate (APS) as initiator. The results intuitively revealed the negative effect posed by the electron‐absorbing effect of the substituents on the polymerization activity of the monomers, and also highlighted the important role of the steric effect. The above work has provided a good theoretical foundation and experimental reserve for further research on the preparation and application of methyl aryl diallyl ammonium chloride.

Covalent Organic Framework with Multi-Cationic Molecular Chains for Gate Mechanism Controlled Superionic Conduction in All-Solid-State Batteries.

Although solid-state batteries (SSBs) are high potential in achieving better safety and higher energy density, current solid-state electrolytes (SSEs) cannot fully satisfy the complicated requirements of SSBs. Herein, a covalent organic framework (COF) with multi-cationic molecular chains (COF-MCMC) was developed as an efficient SSE. The MCMCs chemically anchored on COF channels were generated by nano-confined copolymerization of cationic ionic liquid monomers, which can function as Li+ selective gates. The coulombic interaction between MCMCs and anions leads to easier dissociation of Li+ from coordinated states, and thus Li+ transport is accelerated. While the movement of anions is restrained due to the charge interaction, resulting in a high Li+ conductivity of 4.9×10-4 S cm-1 and Li+ transference number of 0.71 at 30 °C. The SSBs with COF-MCMC demonstrate an excellent specific energy density of 403.4 Wh kg-1 with high cathode loading and limited Li metal source.

Covalent Organic Framework with Multi‐Cationic Molecular Chains for Gate Mechanism Controlled Superionic Conduction in All‐Solid‐State Batteries

AbstractAlthough solid‐state batteries (SSBs) are high potential in achieving better safety and higher energy density, current solid‐state electrolytes (SSEs) cannot fully satisfy the complicated requirements of SSBs. Herein, a covalent organic framework (COF) with multi‐cationic molecular chains (COF‐MCMC) was developed as an efficient SSE. The MCMCs chemically anchored on COF channels were generated by nano‐confined copolymerization of cationic ionic liquid monomers, which can function as Li+ selective gates. The coulombic interaction between MCMCs and anions leads to easier dissociation of Li+ from coordinated states, and thus Li+ transport is accelerated. While the movement of anions is restrained due to the charge interaction, resulting in a high Li+ conductivity of 4.9×10−4 S cm−1 and Li+ transference number of 0.71 at 30 °C. The SSBs with COF‐MCMC demonstrate an excellent specific energy density of 403.4 Wh kg−1 with high cathode loading and limited Li metal source.

Optimal combination of UV‐induced cationic ring opening polymerization monomers for light‐weight automotive plastic coating

AbstractCROP reactivity of organic coatings composed of three structurally different monomers with epoxy or oxetane derivatives was investigated, focusing on rheological and surface mechanical properties. Real‐time crosslinking behavior of CROP monomers was monitored using a rotational rheometer. Results of differential scanning calorimetry with in situ UV irradiation revealed that the ring opening reactivity of CROP monomers protonated by a photoacid generator (PAG) was correlated with the heat released during the exothermic polymerization reaction. In addition, reaction conversions of monomers with epoxy and oxetane groups were compared using Fourier transform infrared spectroscopy (FT‐IR) under dark curing conditions. Surface and internal mechanical properties of coating films, including adhesion with polycarbonate substrate, were comprehensively evaluated by nano‐indentation, nano‐scratch, and surface and interfacial cutting analysis system (SAICAS) tests. By understanding the unique crosslinking characteristics of each CROP monomer, the ternary CROP monomer system, optimally containing with ECC of 53.6 wt%, DOX of 22.9 wt%, and DEO of 15.3 wt%, exhibited improved crosslinking density (G′ from 104 to 107 Pa) and exceptional mechanical (with scratch resistance increasing from 7.11 to 16.17 mN for Lc1), adhesion (with crosscut resistance increasing from 0 to 5B), and transparency properties, surpassing the performance of unitary ECC coating system.

Two‐dimensional Supramolecular Polymers Based on Selectively Recognized Aromatic Cation‐π and Donor‐Acceptor Motifs for Photocatalytic Hydrogen Evolution

AbstractTwo‐dimensional (2D) organic polymers have recently received considerable interest, especially those whose architectures are held together via supramolecular engineering. However, current approaches toward supramolecular 2D structures usually suffer from mutual interference of noncovalent interactions and lack of intrinsic functions. Herein, we report well‐regulated 2D supramolecular polymers (2DSPs) through an aromatics‐selective recognition strategy of cation‐π and donor‐acceptor (D‐A) motifs, which are derived from C4‐symmetric cationic monomers and electron‐withdrawing molecules. By subtly designing the strength and direction of noncovalent driving forces, the mutual interference between cation‐π and D‐A interactions is effectively avoided, enabling the construction of 2DSPs in aqueous solution. On this basis, the resultant 2DSPs possess boosted photocatalytic hydrogen evolution activity at a rate of 600 μmol g−1 h−1, which is mainly ascribed to the specific stacking mode of cation‐π/D‐A motifs and the ordered 2D structures.

Two-dimensional Supramolecular Polymers Based on Selectively Recognized Aromatic Cation-π and Donor-Acceptor Motifs for Photocatalytic Hydrogen Evolution.

Two-dimensional (2D) organic polymers have recently received considerable interest, especially those whose architectures are held together via supramolecular engineering. However, current approaches toward supramolecular 2D structures usually suffer from mutual interference of noncovalent interactions and lack of intrinsic functions. Herein, we report well-regulated 2D supramolecular polymers (2DSPs) through an aromatics-selective recognition strategy of cation-π and donor-acceptor (D-A) motifs, which are derived from C4 -symmetric cationic monomers and electron-withdrawing molecules. By subtly designing the strength and direction of noncovalent driving forces, the mutual interference between cation-π and D-A interactions is effectively avoided, enabling the construction of 2DSPs in aqueous solution. On this basis, the resultant 2DSPs possess boosted photocatalytic hydrogen evolution activity at a rate of 600 μmol g-1 h-1 , which is mainly ascribed to the specific stacking mode of cation-π/D-A motifs and the ordered 2D structures.

Thermal and Flocculation Properties of Acacia Gum Grafted with Cationic Polyacrylamide

Acacia gum (AG) was grafted with polyacrylamides with different catonic ratios obtained by using different amounts of acrylamide (AM) and methacrylatoethyl trimethyl ammonium chloride (DMC (cationic monomer)). The thermal properties of these grafted products were investigated by differential scanning calorimetry (DSC) and thermogravimetric (TGA) analyses. The formation of grafted products was confirmed by FTIR spectroscopy and thermal analysis. The effects of different cationic ratios of polyacrylamide on flocculation were evaluated. Flocculation performance was evaluated in kaolin suspension.

Hydrophobically Associating Polyacrylamide “Water-in-Water” Emulsion Prepared by Aqueous Dispersion Polymerization: Synthesis, Characterization and Rheological Behavior

The hydrophobically associating polyacrylamide (HAPAM) is an important kind of water-soluble polymer, which is widely used as a rheology modifier in many fields. However, HAPAM products prepared in a traditional method show disadvantages including poor water solubility and the need for hydrocarbon solvents and appropriate surfactants, which lead to environmental pollution and increased costs. To solve these problems, we reported a novel kind of HAPAM "water-in-water" (w/w) emulsion and its solution properties. In this work, a series of cationic hydrophobic monomers with different alkyl chain lengths were synthesized and characterized. Then, HAPAM w/w emulsions were prepared by the aqueous dispersion polymerization of acrylamide, 2-methylacryloylxyethyl trimethyl ammonium chloride and a hydrophobic monomer. All these emulsions can be stored more than 6 months, showing excellent stability. An optical microscopy observation showed that the particle morphology and the particle size of the HAPAM emulsion were more regular and bigger than the emulsion without the hydrophobic monomer. The solubility tests showed that such HAPAM w/w emulsions have excellent solubility, which took no more than 180 s to dilute and achieve a homogeneous and clear solution. The rheology measurements showed that the HAPAM association increases with a hydrophobe concentration or the length of hydrophobic alkyl chains, resulting in better shear and temperature resistances. The total reduced viscosity was 124.42 mPa·s for cw101, 69.81 mPa·s for cw6-1, 55.38 mPa·s for cw8-0.25, 48.95 mPa·s for cw12-0.25 and 28 mPa·s for cw16-0.25 when the temperature increased from 30 °C to 90 °C. The cw8-2.0 that contains a 2 mol% hydrophobe monomer has the lowest value at 19.12 mPa·s due to the best association. Based on the excellent stability, solubility and rheological properties, we believe that these HAPAM w/w emulsions could find widespread applications.

Poly (ionic liquid) filled and cross-linked bacterial cellulose-based organic-inorganic composite anion exchange membrane with significantly improved ionic conductivity and mechanical strength

The “trade-off” between high ionic conductivity and dimensional stability is a current challenge in preparation of anion-exchange membranes (AEMs). Here, the inorganic precursor tetraethyl silicate (TEOS) was used to induce silica mineralization on the surface of bacterial cellulose (BC) to obtain SiO2@BC. Then the CC of 3-(Trimethoxysilyl)propyl methacrylate (MPS) was modified on the SiO2@BC surface to fabricate MSiO2@BC porous substrate, followed by in situ filling and crosslinking polymerization with the CC of the cationic monomers (VBTAC) to prepare MSiO2@BC-PVD AEM. The inorganic component in the porous substrate not only enhanced the mechanical properties of AEM, but also induced to construct ordered ion transport channels within the membrane that effectively improved the ionic conductivity. The MSiO2@BC-PVD membrane simultaneously exhibited satisfactory ion conductivity (102 mS cm−1) and low swelling ratio (only 5.9%) at 80 °C. Moreover, the MSiO2@BC-PVD membrane showed a favorable tensile strength of 47.1 MPa, which was 95% higher than that of the pure BC/PVD membrane. More importantly, the maximum peak power density of alkaline direct methanol fuel cell assembled with MSiO2@BC-PVD membrane reached to 100 mW cm−2 at 80 °C. The present work opens a novel path to achieve AEMs with excellent ion conductivity and cell performances.

Waste lignin-based cationic flocculants treating dyeing wastewater: Fabrication, performance, and mechanism

Lignin is often considered to be a complex polymeric structural material with excellent scalability. Reduced pressure distillation, a novel effective way, was proposed to recover reusable waste lignin from textile degumming black liquor. The structure of the recovered material was determined by Fourier Transform Infrared Spectroscopy (FT-IR), Gel Permeation Chromatography (GPC) and Klason Component Analysis. Recycled lignin (RL) was used as the basis for the synthesis of a cationic recycled lignin-based polymers (CRLM) through graft polymerizing cationic monomer (DMC). The optimum synthesis conditions were obtained by conducting orthogonal experiments using the cationicity as the studied parameter, while selecting pH, DMC/RL, reaction temperature and time as independent variables. Recovery experiments showed that the maximum recovery concentration of RL in the black liquor was 5 g/L, with a purity of approximately 83 %. Orthogonal experiments showed that a low DMC/RL ratio was crucial for the synthesis of flocculants. When the molar ratio of DMC/RL was 3:1, the cationicity of the prepared CRLM was as high as 11.32 %. Zeta potential and decolorization experiments also confirmed the stable decolorization performance of CRLM in three kinds of anionic dye wastewater. The experimental results showed that charge neutralization, chemical bonding forces and auxiliary effects play great role to remove anionic dyes, resulting in 94 %, 89 % and 94.9 % removal against Reactive Red 195 (RR195), Acid Red 18 (AR18) and Direct 168 (DB168) respectively. Therefore, this study demonstrated the potential of using recycled waste lignin as synthesize lignin-based flocculants in the field of printing and dyeing wastewater by treating waste with waste.

Study on Flocculation Performance of New Cationic Starch‐Based Sludge Wastewater Flocculant

AbstractFrom the perspective of ecological environment and human health, efficient and easily biodegradable starch‐based flocculants for replacing the currently used polyacrylamide (PAM) and cationic PAM (CPAM) flocculants are the future development trend. In this paper, starch graft polymerization of acrylamide‐allyl trimethyl ammonium chloride (St‐g‐ATMAC) is prepared by grafting and copolymerizing acrylamide and the short‐chain quaternary ammonium cationic monomer ATMAC onto the molecular chain of soluble starch. Compared with PAM and CPAM, this flocculant has a lower water content in the filter cake after treating wastewater, making the subsequent treatment easier. Moreover, the flocculant is resistant to high temperature. Specifically, at 40 °C, the filter cake moisture content (FCMC) is still lower than those of PAM and CPAM. Furthermore, the flocculant is resistant to acid and alkali. In the over‐acidic and over‐alkaline environment after treatment, the FCMC remains lower than that of the PAM‐ and CPAM‐treated mud cake. In summary, St‐g‐ATMAC is a new type of water treatment flocculant that can effectively treat wastewater with low dosage, wide temperature, and pH range and has the potential to be widely used in water treatment.

Pore functionalization of cationic covalent organic frameworks membrane: A case towards acid recovery

Covalent organic frameworks (COFs), which are a new class of porous organic materials, are considered as potential candidates for separation membranes because of their regular channels and tailored functionality. The imine-linked COF was synthesized using reversible condensation reactions, resulting in its un-stabilization in the acid environment. Thus, it is a formidable challenge to develop stable COFs membranes for applications in harsh environments (e.g. strong acid). Herein, we demonstrated the in-situ construction of acid-stable COF separating layer (TMTATGCl) on the surface of the hydrophilic hydrolyzed polyacrylonitrile (HPAN) substrate via acid-catalyzed interfacial polymerization. Triaminoguanidine chloride (TGCl), a cationic monomer, was used to construct cationic nanochannels in the COF layer, conferring its screening feature toward cations, especially toward divalent cations. Besides, implanted methoxy groups could facilitate H+ diffusion along the pore pathway of the as-prepared COF. As a result, the methoxy functionalized cationic nanochannels of the DMTATGCl/HPAN enhanced H+ transfer, while other ions (e.g. Fe2+) were obstructed, allowing for high selectivity (S = 1248.9) and permeability (UH+ = 0.0118 m/h). Moreover, the membranes (TMTATGCl/HPAN) exhibited remarkable acid-stability, which maintained the high separation performance after 10 cycles under strong-acid conditions. This study provides an effective strategy for developing the ion channels membrane with specific interaction sites for effective ion separation.

Engineering of an electrically charged hydrogel implanted into a traumatic brain injury model for stepwise neuronal tissue reconstruction

Neural regeneration is extremely difficult to achieve. In traumatic brain injuries, the loss of brain parenchyma volume hinders neural regeneration. In this study, neuronal tissue engineering was performed by using electrically charged hydrogels composed of cationic and anionic monomers in a 1:1 ratio (C1A1 hydrogel), which served as an effective scaffold for the attachment of neural stem cells (NSCs). In the 3D environment of porous C1A1 hydrogels engineered by the cryogelation technique, NSCs differentiated into neuroglial cells. The C1A1 porous hydrogel was implanted into brain defects in a mouse traumatic damage model. The VEGF-immersed C1A1 porous hydrogel promoted host-derived vascular network formation together with the infiltration of macrophages/microglia and astrocytes into the gel. Furthermore, the stepwise transplantation of GFP-labeled NSCs supported differentiation towards glial and neuronal cells. Therefore, this two-step method for neural regeneration may become a new approach for therapeutic brain tissue reconstruction after brain damage in the future.

Decomposition mechanisms of nuclear-grade cationic exchange resin by advanced oxidation processes: Statistical molecular fragmentation model and DFT calculations

The treatment and disposal of radioactive waste are presently facing great challenges. Spent ion exchange resins have become a focus of attention due to their high production and serious environmental risks. In this paper, a simplified model of cationic exchange resin is proposed, and the degradation processes of cationic resin monomer initiated by hydroxyl radicals (·OH) are clarified by combining statistical molecular fragmentation (SMF) model and density functional theory (DFT) calculations. The prediction of active sites indicates that the S-O bonds and the C-S bond of the sulfonic group are more likely to react during the degradation. The meta-position of the sulfonic group on the benzene ring is the most active site, and the benzene ring without the sulfonic group has a certain reactivity. The C11-C14 and C17-C20 bonds, on the carbon skeleton, are the most easily broken. It is also found that dihydroxy addition and elimination reactions play a major role in the process of desulfonation, carbon skeleton cleavage and benzene ring separation. The decomposition mechanisms found through the combination of physical models and chemical calculations, provide theoretical guidance for the treatment of complex polycyclic aromatic hydrocarbons.

Multi‐Hydration Induced Zwitterionic Hydrogel with Open Environment Stability for Chemical Sensing

AbstractHydrogels with open environment stability are of great significance in the fields of microelectronics, organ regeneration, and hydrogel‐based sensors. Although a series of strategies for exploring highly robust hydrogels have been proposed, it is still challenging to improve environmental stability while maintaining the original dispersed medium feature. Here, 1‐vinyl‐3‐butylimidazolium (VBIM) and acrylic acid (AA) are used as the anionic and cationic monomers to prepare zwitterionic hydrogels through the thermal initiation polymerization. The prepared PAA‐IL (polyacrylic acid‐co‐ionic liquid) hydrogel forms a large number of multi‐hydration, including hydrogen bonds and ion‐dipole interactions with water to inhibit the freezing and volatilization of water, and it possesses good structural stability due to the formation of ion bond self‐association through interchain charge interaction. The robust stability of the chemical sensor with PAA‐IL hydrogels as the substrate at different pH and temperature verifies the validity of the proposed design strategy. It is expected that the present zwitterionic hydrogel design strategy would shine a light on the exploration of environment‐stable hydrogels and hydrogel‐based chemical sensors.

Cationic Single-Unit Monomer Insertion (cSUMI): From Discrete Oligomers to the α-/ω-End and In-Chain Sequence-Regulated Polymers

Single-unit monomer insertion (SUMI) has become an important strategy for the synthesis of sequence-controlled vinyl polymers due to its strong versatility and high efficiency. However, all reported SUMI processes are based on a free-radical mechanism, resulting in a limited number of monomer types being applicable to SUMI or a limited number of sequences of structural units that SUMI can synthesize. Herein, we developed a novel SUMI based on a cationic mechanism (cSUMI), which operates through a degenerative (similar to radical SUMI) but cationic chain transfer process. By optimizing the chain transfer agent (CTA) and monomer pairs, a high-efficiency cSUMI was achieved for vinyl ether and styrene monomers. Based on this reaction, a range of discrete oligomers containing vinyl ether and styrene moieties, and even α-/ω-end and in-chain sequence-regulated polymers were synthesized, most of which cannot be achieved by radical SUMI. In addition, we explored the application of these sequence-regulated polymers in the preparation of miktoarm star polymers, delivery of photosensitizers, and solubilization of fluorescence probes. The development of SUMI with a new mechanism will certainly broaden the scope of structures and sequences in precise vinyl-based polymers.