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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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Multiple Responsive Photonic Prints Through Localized Interpenetrating Polymer Network

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Chemical Research in Chinese Universities 2023年第5期39卷 803-808页

作者： ZHANG Tian JIA Xiaolu hou zaiyan XIE Ge ZHANG Lianbin ZHU Jintao Key Laboratory of Material Chemistry for Energy Conversion and Storage of Ministry of Education State Key Laboratory of Materials Processing and Mold TechnologySchool of Chemistry and Chemical EngineeringHuazhong University of Science and TechnologyWuhan 430074P.R.China School of Chemistry&Chemical Engineering Zhoukou Normal UniversityZhoukou 466001P.R.China

Multiple responsive photonic prints that can be revealed by a thermal or light stimulus are prepared by locally producing interpenetrating polymer network(IPN)within photonic ***-responsive poly-(N-isopropylacrylamide)(PNIPAM)photonic hydrogels with self-assembled monodisperse carbon-encapsulated Fe_(3)O_(4) nanoparticles(Fe_(3)O_(4)@C NPs)are first prepared by a photopolymerization *** photopolymerization of acrylamide(AM)is carried out within the photonic hydrogel with the help of a mask to generate an IPN structure *** of the regionally different network structure and the resulting varied responsiveness,responsive photonic prints are *** to the thermo-responsive capability of the PNIPAM and the photothermal conversion capability of the incorporated Fe_(3)O_(4)@C NPs,the as-prepared photonic prints with a localized IPN structure can shift the structural color in a broad spectrum range under thermal or light *** current multiple responsive photonic prints with a localized IPN structure can realize full-color pattern display under thermal and light stimulations,providing a new path for anti-counterfeiting,display,and information encoding.

关键词： Photonic crystal Photothermal Hydrogel Patterning Stimuli-responsive

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