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Oxidation-responsive framboidal triblock copolymer vesicles prepared by photoinitiated RAFT seeded emulsion polymerization

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Chinese Chemical Letters 2023年第3期34卷 434-437页

作者： Jun He Ying Chen Li Zhang Jianbo Tan Department of Polymeric Materials and Engineering School of Materials and EnergyGuangdong University of TechnologyGuangzhou 510006China Guangdong Provincial Key Laboratory of Functional Soft Condensed Matter Guangzhou 510006China

Stimulus-responsive vesicles have broad applications in a variety of areas. Herein, oxidation-responsive framboidal triblock copolymer vesicles are prepared by photoinitiated RAFT seeded emulsion polymerization of a thioether-functionalized monomer using diblock copolymer vesicles as seeds. The obtained framboidal vesicles can transform into worms or spheres in the presence of reactive oxygen species,which can be further used for controlled release of cargos(e.g., silica nanoparticles).

关键词： RAFT polymerization block copolymer Vesicles Oxidation-responsive Emulsion polymerization

Large-scale chiral spherulites with controllable circularly polarized luminescence in liquid crystal block copolymers film

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Aggregate 2024年第1期5卷 427-435页

作者： Jianan Yuan Xuemin Lu Qinghua Lu School of Chemistry and Chemical Engineering Shanghai Jiao Tong UniversityShanghaiChina School of Chemical Science and Engineering Tongji UniversityShanghaiChina

Macroscopic chiral spherulites prepared by hierarchical self-assembly have attracted considerable attention due to their excellent property as chiroptical ***,preparing controllable chiral spherulites in bulk film remains a challenge due to the absent knowledge of the evolution mechanism from the molecule to macroscopic crystal during chiral *** this contribution,chiral macroscopic spherulites were constructed with controllable circularly polarized luminescence(CPL)using enantiomeric tartaric acid and rhodamine B co-assembled with liquid crystal block copolymers,poly(ethylene oxide)-b-poly(methyl methacrylate)bearing azobenzene group side *** was found that the chiral liquid crystal field induced by exogenous chiral molecules was closely related to the formation of macroscopic chiral ***,the transformation of azobenzene cis-trans isomerization under photo-thermal endows films with adjustable *** facile strategy provides a platform to design large-scale chiral structures for chiroptical switching,encryption,and memory storage materials.

关键词： block copolymer circularly polarized luminescence macroscopic chirality self-assembly

Cooperative organizations of small molecular surfactants and amphiphilic block copolymers:Roles of surfactants in the formation of binary co-assemblies

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Aggregate 2021年第6期2卷 8-27页

作者： Yuanyuan Cao Shaobo Yang Yongsheng Li Jianlin Shi Lab of Low-Dimensional Materials Chemistry Key Laboratory for Ultrafine Materials of Ministry of EducationShanghai Engineering Research Center of Hierarchical NanomaterialsFrontiers Science Center for Materiobiology and Dynamic ChemistrySchool of Materials Science and EngineeringEast China University of Science and TechnologyShanghaiChina State Laboratory of High Performance Ceramics and Superfine Microstructure Shanghai Institute of CeramicsChinese Academy of SciencesShanghaiChina

The construction of highly ordered organizations through self-assembly is one of the most popular phenomena both in natural and artificial *** molecules are the most commonly used building blocks for the self-assembly,which are conventionally known as amphiphilic low molecular weight surfactants with polar heads and nonpolar tails,or amphiphilic block copolymers(BCPs)consisting of covalently bonded hydrophilic and hydrophobic block *** with single surfactant self-assembly system,binary amphiphiles co-assembly systems composing of both small mass surfactants and amphiphilic BCPs feature high flexibilities and versatilities in materials designing and structure regulation,ascribing to the vast possibilities of intermolecular interactions within the systems and facile component modulations during the assembly *** amphiphilic features of the two kinds of molecules endow them with similar self-assembly behaviors,while the unique and distinct characters of each kind of amphiphiles lead to various complex but highly diversified co-assembly *** to the roles of the surfactant played in the co-assembly system,in this review,we summarize the binary coassembly systems from three distinct types:1)the co-micellization system in which the surfactants are added into the BCPs assemblies as a self-assembly assistant;2)the co-emulsification system in which the surfactants work as an emulsion stabilizer to assist and confine the assembly of BCPs in 3D geometries;3)the co-templating system where the individual micelles of both surfactant and BCPs are hierarchically arranged and distributed to guide the formation of hierarchical *** this,the major potential applications of the nanomaterials synthesized from the binary amphiphiles in biological field are ***,we shortly discuss the current challenges and future perspectives of the binary amphiphiles selfassembly systems.

关键词： amphiphilic molecules binary self-assembly block copolymer mesoporous materials surfactant

Understanding the Impact of Fluorine Substitution on the Photovoltaic Performance of block copolymers

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Transactions of Tianjin University 2022年第5期28卷 406-413页

作者： Bin Li Siying Li Xue Yang Jianyu Yuan Jiangsu Key Laboratory for Carbon-Based Functional Materials and Devices Institute of Functional Nano and Soft MaterialsSoochow UniversitySuzhou 215123China

Fluorine substitution was applied to the donor and acceptor segments of block copolymers to understand the impact of molecular structure on photovoltaic block copolymers and explore efficient materials for single-component organic solar cells(SCOSCs).Along this line,three fluorinated block copolymers,namely PBDB-T-b-PTYF6,PM6-b-PTY6,and PM6-bPTYF6,derived from PBDB-T-b-PTY6 were designed and *** UV-Vis absorption,energy level,and thin-film morphology of these block copolymers were systematically *** fluorinated block copolymers show narrow bandgap and improved *** enhanced open-circuit voltage was observed in the SCOSC based on ***,SCOSCs based on all fluorinated block copolymers exhibited low short-circuit current due to energy level mismatch and therefore had low power conversion efficiency at around 4%.By contrast,the SCOSCs based on control block copolymer PBDB-T-b-PTY6 exhibited the highest power conversion efficiency approaching 10%,with a high short-circuit current of 18.57 mA/cm~*** study was the first to perform fluorination on photovoltaic block copolymers and provides insight into precisely controlling the polymer structure and understanding the structure-property relationship in SCOSCs based on block copolymers.

关键词： block copolymer Fluorine substitution Single-component organic solar cells Morphology

Control on self-assembly structures of rod-coil-rod (PANI)_(98) -(PEG)_(136) -(PANI)_(98) triblock copolymer

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Frontiers of Chemical Science and Engineering 2008年第1期2卷 85-88页

作者： Zhifang YANG Jingao WU Yingkui YANG Xingping ZHOU Xiaolin XIE Department of Chemistry and Chemical Engineering Huazhong University of Science and TechnologyWuhan 430074China

The self-assembly behaviors of the rod-coil-rod(PANI)_(98)-(PEG)_(136)-(PANI)_(98) triblock copolymer are investigated in different solvents,such as N-methyl-2-pyrrolidone(NMP),dimethyl formamide(DMF),ethanol and *** effects of solvents,concentration and ultrasonic irradiation on self-assembly are *** results indicate that the triblock copolymer forms particles,rods,fiber,networks and fiber bands in the above solvents,***,the triblock copolymer can form a multi-layer,tri-dimensional fibrous network and a petaline structure from the mono-layer fibrous network with the increase of its concentration in ***,the ultrasonic irradiation has a great effect on the self-assembly of the triblock copolymer.

关键词： block copolymer self-assembly selective solvent

Aluminum Porphyrin Complex Mediated Auto-Tandem Catalysis for One-Pot Synthesis of block copolymers

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CCS Chemistry 2022年第1期4卷 122-131页

作者： Yajun Zhao Shuaishuai Zhu Xiaojing Li Xiaoyu Zhao Jing Xu Bijin Xiong Yong Wang Xingping Zhou Xiaolin Xie Key Lab for Material Chemistry of Energy Conversion and Storage Ministry of EducationSchool of Chemistry and Chemical EngineeringHuazhong University of Science and TechnologyWuhan 430074 College of Chemistry and Material Science Shandong Agricultural UniversityTaian 271018

Auto-tandem catalysis that uses a single catalyst to bridge and discriminate different catalytic cycles in a one-pot process is highly desirable for obtaining a high degree of structural complexity;however,it is a great challenge to develop auto-tandem catalytic systems in polymer ***,we report the auto-tandem catalysis by rationally designed aluminum porphyrin complexes,wherein well-controlled photoinduced electron/energy transfer–reversible addition-fragmentation chain transfer(PET-RAFT)polymerization of vinyl monomers and completely alternating ring-opening copolymerization(ROCOP)of epoxides/anhydrides can occur in a concurrent or sequential *** a carboxylic group incorporated trithiocarbonate compound bearing a carboxylic acid group(TTC-COOH)as the bifunctional chain transfer agent(CTA),the auto-tandem catalysis provides one-pot access to diblock copolymers with predictable molecular weights and narrow ***,the efficient electron/energy transfer from 5,10,15,20-tetrakis(2-chlorophenyl)porphyrin aluminum(III)chloride[(TPP^(2-Cl))Al^(III)-Cl]to TTC-COOH and their axial group exchange reactions completely circumvent the formations of undesirable homopolymers.

关键词： auto-tandem catalysis PET-RAFT polymerization ring-opening copolymerization block copolymer metalloporphyrin

ADVANCES IN MICROEMULSION PHASE ON SELF-ASSEMBLY AND MICELLE EXTRACTION WITH block copolymerS

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China Particuology 2005年第6期3卷 310-316页

作者： Chen Guo Hao Wen Huizhou Liu Lahoratory of Separation Science and Engineering State Key Laboratory of Biochemical EngineeringInstitute of Process EngineeringChinese Academy of Sciences.P.O.Box 353Beijing 100080P.R.China

In this paper we review our work on self-assembly of the system, poly（ethylene oxide）-poly（propylene oxide）-poly（elhylene oxide）（PEO-PPO-PEO） block copolymers, which is a kind of macromolecular complex fluids. The control of self-assembly could be obtained by adding inorganic salts or aliphatic alcohols. By self-assembly of amphiphilic block copelymers a microemulsion phase is formed which could be applied in micelle extraction, such as hollow-fiber membrane micelle extraction, magnetic micelle extraction and immobilized micelle extraction.

关键词： microemulsion phase self-assembly block copolymer extraction

Directed self-assembly of block copolymers for sub-10 nm fabrication

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International Journal of Extreme Manufacturing 2020年第3期2卷 126-159页

作者： Yu Chen Shisheng Xiong School of Information Science and Technology Fudan UniversityShanghaiPeople's Republic of China

Directed self-assembly(DSA)emerges as one of the most promising new patterning techniques for single digit miniaturization and next generation *** achieves high-resolution patterning by molecular assembly that circumvents the diffraction limit of conventional ***,the International Roadmap for Devices and Systems listed DSA as one of the advanced lithography techniques for the fabrication of 3-5 nm technology node *** can be combined with other lithography techniques,such as extreme ultra violet(EUV)and 193 nm immersion(193i),to further enhance the patterning resolution and the device *** far,DSA has demonstrated its superior ability for the fabrication of nanoscale devices,such as fin field effect transistor and bit pattern media,offering a variety of configurations for high-density integration and low-cost *** 1 T in-2 device density can be achieved either by direct templating or coupled with nanoimprinting to improve the *** development of high x block copolymer further enhances the patterning resolution of *** addition to its superiority in high-resolution patterning,the implementation ofDSA on a 300 mm pivot line fully demonstrates its potential for large-scale,high-throughput,and cost-effective manufacturing in industrial environment.

关键词： directed self-assembly lithography nanofabrication sub-10 nm block copolymer

Morphology of Films of SEBS Triblock copolymers

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Chinese Journal of Chemical Engineering 2005年第4期13卷 498-503页

作者： HAN Xia（韩霞） LIU Honglai（刘洪来） DONG Yaming（董亚明） Hu Ying（胡英） Department of Chemistry State Key Laboratory of Chemical Engineering East China University of Science and Technology Shanghai 200237 China

Surface morphologies of the films of poly [styrene-b-（ethylene-co-butene）-b-styrene] （SEBS） have been studied by using tapping-mode atomic force microscopy （TM-AFM）. The films of block copolymer were prepared both by spin-coating on mica and by solvent-casting on different solution surfaces. For spin-coating samples, the effect of solution concentration, solvent, and annealing temperature are investigated. It is shown that changing the concentration of the solution makes no difference on the morphology of the film of the block copolymer. The microstructures are quite stable during thermal annealing; only the size of the domains changes toward the equilibrium configuration. However, solvent annealing can notably change the microstructures. When different selective solvents are used for film spin-coating, different morphologies can be obtained and explained by the different solubility parameters of the solvents. As expected, significant different morphologies in the top and the bottom surfaces of the casting films were observed. The images of the top surfaces reveal cylinder microdomains, while those of the bottom surfaces were spherical morphologies.

关键词： atomic force microscopy (AFM) morphology block copolymer spin-coating solvent-casting