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聚集体(英文) 2021年第1期2卷 35-47页

作者： Qiao Zhang Shengyi Dong Mingming Zhang Feihe Huang College of Chemistry and Chemical Engineering Hunan UniversityChangshaP.R.China State Key Laboratory for Mechanical Behavior of Materials Shaanxi International Research Center for Soft MatterSchool of Materials Science and EngineeringXi’an Jiaotong UniversityXi’anP.R.China State Key Laboratory of Chemical Engineering Center for Chemistry of High-Performance&Novel MaterialsDepartment of ChemistryZhejiang UniversityHangzhouP.R.China Green Catalysis Center and College of Chemistry Zhengzhou UniversityZhengzhouP.R.China Correspondence Shengyi DongCollege of Chemistry and Chemical EngineeringHunan UniversityChangsha 410082P.R.China

lower critical solution temperature(LCST)is the critical temperature below which the solution is miscible for all compositions and above which the solution becomes a *** study of LCST properties has become a central research topic due to its profound impact on the applications of stimuli-responsive *** by the marriage between materials science and supramolecular chemistry,the introduction of supramolecular pairs and interactions into polymeric LCST systems is increasingly ***,supramolecular interactions provide precise control over LCST behavior in both water and organic ***,supramolecular interactions not only control or adjust LCST behavior(supramolecular interaction controlled LCST),but also induce LCST phase behavior in species lack of thermo-sensitive properties(supramolecular interaction induced LCST).In this review,we summarize the applications of supramolecular interactions in LCST *** examining the relationship between supramolecular interactions and LCST changes,we further discuss the differences between supramolecular interaction controlled LCST and supramolecular interaction induced *** hope this review will give our readers a snapshot on how the supramolecular interactions influence the LCST behavior in various systems,and benefit them with different applications.

关键词： host-guest interactions lower critical solution temperature molecular recognition phase separation supramolecular chemistry

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temperature/pH dual-responsive reversible morphology evolution of block copolymer microparticles under three-dimensional confinement

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Science China Chemistry 2023年第12期66卷 3587-3593页

作者： Mengmeng Zhang Zaiyan Hou Simeng Liu Guoqiang Han Meirong Tian Jintao Zhu Jiangping Xu Key Laboratory of Materials Chemistry for Energy Conversion and Storage of Ministry of Education School of Chemistry and Chemical EngineeringHuazhong University of Science and TechnologyWuhan 430074China

Development of block copolymer(BCP)microparticles with switchable morphology in response to external stimuli is important for exploiting new intelligent *** this work,thermo/p H dual-responsive nanoparticles(NPs)were employed as a cosurfactant to modulate the self-assembly morphology of polystyrene-b-poly(2-vinylpyridine)(PS-b-P2VP)microparticles within confined emulsion *** co-surfactant was synthesized by grafting poly(acrylic acid)-b-poly(N-isopropylacrylamide)onto the surface of *** introduction of the dual-responsive co-surfactant enabled thermo/p H dual-responsive reversible morphology transition of the PS-b-P2VP microparticles by tailoring the hydrophobicity and interfacial affinity of the *** using this strategy,the thermo-inert PS-b-P2VP self-assembled into pupa-like microparticles at T=10℃ and p H7.5,which could transform into tulip-like microparticles when T was increased to 50℃.When the p H value was increased to 11,the pupa-like particles turned into onion-like microparticles although the PS-b-P2VP was inert to ***,the pupa-like microparticles remained unchanged when both T and p H were simultaneously *** PAA-b-PNIPAM-grafted Fe3O4NP surfactants showed obvious advantages over the linear PAA-b-PNIPAM surfactants in modulating the morphology transition,since the linear PAA-b-PNIPAM could not induce the reversible shape transition of *** work provides an efficient strategy to achieve reversible shape transformation of BCP microparticles while the internal phase structure is preserved,which may be utilized to switch the structural color properties of BCP microparticles.

关键词： block copolymer self-assembly stimuli-responsiveness lower critical solution temperature microparticle

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Micromechanical properties of poly(N-isopropylacrylamide)hydrogel microspheres determined using a simple method

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Particuology 2015年第2期13卷 164-172页

作者： Mei Yuan Xiaojie Ju Rui Xie Wei Wang Liangyin Chu School of Chemical Engineering Sichuan University

temperature-responsive poly（N-isopropylacrylamide）（PNIPAM） hydrogel microspheres have attracted extensive attention because of their promising diverse biomedical applications. A quantitative understanding of the micromechanical properties of these microspheres is essential for their practical application. Here, we report a simple method for the characterization of the elastic properties of PNIPAM hydrogel microspheres. The results show that PNIPAM hydrogel microspheres exhibit elastic deformation and the obtained force-deformation experimental data fits the Hertz theory well. The moduli of elasticity of the PNIPAM hydrogel microspheres prepared under different conditions were systematically investigated in this work for the first time. The PN1PAM hydrogel microsphere composition significantly affects their micromechanical properties and their temperature sensitivity behavior. PNIPAM hydrogel microspheres with a larger equilibrium volume change have a lower modulus of elasticity. The modulus of elasticity of the PNIPAM hydrogel microspheres at body temperature （37 ℃, above the lower critical solution temperature （LCST） of PNIPAM） is much higher than that at room temperature （25 ℃, below the LCST of PNIPAM） because ofthermo-induced volume shrinkage and an increase in stiffness. These results provide valuable guidance for the design of smart materials for practical biomedical applications. Moreover, the simple microcompression method presented here also provides a versatile way to investigate the micromechanical properties of microscopic biomedical materials.

关键词： Poly(N-isopropylacrylamide) Microspheres Micromechanical properties Modulus of elasticity temperature-responsive volume change lower critical solution temperature

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Supramolecular control over LCST behavior of hybrid macrocyclic system based on pillar[5]arene and crown ether

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Chinese Chemical Letters 2020年第12期31卷 3221-3224页

作者： Yan Deng Xing Li Chengyou Han Shengyi Dong College of Chemistry and Chemical Engineering Hunan UniversityChangsha 410082China Department of Chemistry College of ScienceChina University of Petroleum(East China)Qingdao 266580China

A hybrid system containing a pillar[5]arene unit and ten crown ether moieties was *** LCST behavior and thermo-responsive ness were successfully introduced into this pillar[5]arene-crown ether *** host-guest interactions and salting-out effect displayed great effects in realizing the supramolecular control over LCST properties and the rmo-re *** red with the individual macrocycles,this hybrid macrocycle system dramatically amplified the supramolecular control effect over LCST behavior.

关键词： Supramolecular chemistry lower critical solution temperature Pillar[n]arene Host-guest interactions Crown ether

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