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Preparation and Structure-Property Regulation Mechanism of Reversible Thermochromic Polydiacetylene

Chinese Journal of Polymer Science 2024年第8期42卷 1111-1121页

作者： Zhi-Qing Ge Shuo Yan Zu-Xiong Pan Shan Lei Xuan-Zhi Mao Chu Zhao mo-zhen wang Xue-Wu Ge Key Laboratory of Precision and Intelligent Chemistry Department of Polymer Science and EngineeringUniversity of Science and Technology of ChinaHefei 230026China Marshall Laboratory of Biomedical Engineering International Cancer CenterLaboratory of Evolutionary Theranostics(LET)School of Biomedical EngineeringShenzhen University Medical SchoolShenzhen UniversityShenzhen 518055China Shanghai Institute of Applied Physics Chinese Academy of SciencesShanghai 201800China University of Chinese Academy of Sciences Beijing 100049China

The thermochromic mechanism and the structure-property regulation principle of reversible thermochromic polydiacetylene(PDA)materials have always been a challenging *** this work,a series of diacetylene monomers(m-PCDA)containing phenyl and amide or carboxyl groups were synthesized from 10,12-pentacosadiynoic acid(PCDA)through the esterification or amidation *** effects of the number and the distribution of the functional groups in m-PCDA molecules on their solid-state polymerization capability,and the thermochromic mechanism of their corresponding polymers(m-PDA)were investigated and discussed in *** results show that the m-PCDA monomers containing both benzene ring and groups that can form hydrogen bonding interactions have strong intermolecular interaction,and are easy to carry out the solid phase polymerization under 254-nm UV irradiation to obtain the corresponding new thermochromic m-PDA *** thermochromic behavior of m-PDA depends on its melting *** initial color-change temperature(blue to red)is determined by the onset melting tem perature,and the temperature range in which reversible color recovery can be achieved by repeat heating-cooling treatment is determined by its melting *** to the proposed thermochromic mechanism of PDA,various new PDA materials with precise thermochromic temperatu res and reversible thermochromic temperature ra nges can be designed and synthesized through the appropriate introduction of benzene ring and groups that can form hydrogen bonding interactions into the molecular structure of linear diacetylene *** work provides a perspective to the precise molecular structure design and the property regulation of the reversible thermochromic PDA materials.

关键词： Polydiacetylene Thermochromism Hydrogen bonding Chemical modification

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Synthesis and Optical Properties of ZnO Nanoparticles in Submicron PS Hollow Reactors

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Chinese Journal of Chemical Physics 2012年第6期25卷 719-724,I0004页

作者： Xue-feng Huang Fei-fei Ju mo-zhen wang Xue-wu Ge CAS Key Laboratory of Soft Matter Chemisry Department of Polymer Science and EngineeringUniversity of Science and Technology of China Hefei 230026 China

ZnO nanoparticles were first encapsulated in submicron PS hollow microspheres through two-step swelling process of core-shell structured PMMA/PS （PMMA： polymethyl methao- rylate） microspheres in acid-alkali solution, and the ZnO precursors, i.e. the ethanol solu- tions of （CHaCOO）2Zn and LiOH. The transmission electron microscope, X-ray diffraction, and thermogravimetric analysis results show that the feeding order of ethanol solutions of （CH3COO）2Zn and LiOH in the second swelling step has great influence on the loading efficiency and the size of ZnO nanoparticles, but little on their crystal form. The photolumi- nescence and UV-Vis absorption behavior of ZnO/PS microspheres show that the PS shell can effectively avoid the fluorescence quenching effect.

关键词： ZnO/PS hybrid material Core-shell polymer Swelling PS hollow microsphere Optical property

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Fabrication of macroporous polystyrene/graphene oxide composite monolith and its adsorption property for tetracycline

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Chinese Chemical Letters 2016年第4期27卷 511-517页

作者： Le-Chen Chen Shan Lei mo-zhen wang Jun Yang Xue-Wu Ge The USTC-Anhui Tobacco Joint Laboratory of Tobacco Chemistry CAS Key Laboratory of Soft Matter Chemistry Department of Polymer Science and Engineering University of Science and Technology of China The USTC-Anhui Tobacco Joint Laboratory of Tobacco Chemistry Research Center of Tobacco and Health University of Science and Technology of China

Macroporous polystyrene microsphere/graphene oxide（PS/GO） composite monolith was first prepared using Pickering emulsion droplets as the soft template. The Pickering emulsion was stabilized by PS/GO composite particles in-situ formed in an acidic water phase. With the evaporation of water and the oil phase（octane）, the Pickering emulsion droplets agglomerated and combined with each other, forming a three-dimensional macroporous PS/GO composite matrix with excellent mechanical strength. The size of the macrospores ranged from 4 mm to 20 mm. The macroporous PS/GO composite monolith exhibited high adsorption capacity for tetracycline（TC） in an aqueous solution at p H 4–6. The maximum adsorption capacity reached 197.9 mg g 1at p H 6. The adsorption behaviour of TC fitted well with the Langmuir model and pseudo-second-order kinetic model. This work offers a simple and efficient approach to fabricate macroporous GO-based monolith with high strength and adsorption ability for organic pollutants.

关键词： Graphene oxide Polystyrene microsphere Macroporousm Adsorption Tetracycline

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In-situ Enhanced Toughening of Poly（ethylene terephthalate）/elastomer Blends via Gamma-Ray Radiation at Presence of Trimethylolpropane Triacrylate

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Chinese Journal of Chemical Physics 2016年第6期29卷 703-709,I0001,I0002页

作者： Li-zhao Xie Le-chen Chen mo-zhen wang Qi-chao Wu Xiao Zhou Xue-wu Ge CASKeyLaboratoryofSoftMatterChemistry DepartmentofPolymerScienceandEngineeringUniversityofScienceandTechnologyofChinaHefei230026China GuangdongTiananNewMaterialCo. Ltd.Foshan528000China

Gamma-ray radiation has always been a convenient and effective way to modify the inter- facial properties in polymer blends. In this work, a small amount of trimethylolpropane triacrylate （TMPTA） was incorporated into poly（ethylene terephthalate）（PET）/random terpolymer elastomer （ST2000） blends by melt-blending. The existence of TMPTA would induce the crosslinking of PET and ST2000 molecular chains at high temperatures of blend- ing, resulting in the improvement in the impact strength but the loss in the tensile strength. When the PET/ST2000 blends were irradiated by gamma-ray radiation, the integrated me- chanical properties could be enhanced significantly at a high absorbed dose. The irradiated sample at a dose of 100 kGy even couldn＇t be broken under the impact test load, and at the same time, has nearly no loss of tensile strength. Based on the analysis of the impact- fractured surface morphologies of the blends, it can be concluded that gamma-ray radiation at high absorbed dose can further in situ enhance the interfacial adhesion by promoting the crosslinking reactions of TMPTA and polymer chains. As a result, the toughness and strength of PET/ST2000 blend could be dramatically improved. This work provides a facial and practical way to the fabrication of polymer blends with high toughness and strength.

关键词： Toughened PET blend Interracial interaction Gamma-ray radiation Radia- tion crosslink Trimethylolpropane triacrylate

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One-step synthesis of self-healable hydrogels by the spontaneous phase separation of linear multi-block copolymers during the emulsion copolymerization

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Chinese Chemical Letters 2017年第4期28卷 868-874页

作者： Lan-Lan Li Ru-Yi Jiang Jin-Xing Chen mo-zhen wang Xue-Wu Ge CAS Key Laboratory of Soft Matter Chemistry Department of Polymer Science and EngineeringUniversity of Science and Technology of ChinaHefei 230026China Petro China Company Limited Beijing 100007China

Self-healable polyacrylamide-based hydrogels were prepared at room temperature via a one-step emulsion copolymerization of acrylamide（AM）,dodecyl 2-methacryIate（DM）,and 5-acetylaminopentyl acrylate（AAPA） using sodium dodecyl sulfonate（SDS） as the emulsifier and ammonium persulfate（APS）as the *** produced linear multi-block copolymer chains are composed of randomly-linked hydrophilic polyacrylamide segments（PAM） and hydrophobic segments constituted by DM and AAPA units（P（DM-co-AAPA））.The P（DM-co-AAPA） segments will self-aggregate into hydrophobic microdomains during the polymerization process driven by the hydrophobic interactions,and finally separate from water phase,acting as the crosslinks and leading to the formation of strong hydrogels with a storage modulus as high as 400 *** hydrophobic microdomains will be dissolved in water when the temperature increases to 70℃,resulting in a temperature-responsive reversible sol-gel transition of the prepared ***,the prepared hydrogels have excellent self-healing *** broken hydrogels can be automatically healed into a body with a same strength within 2-min＇s *** work provides a new simple way to prepare reversible physical crosslinked hydrogel with high strength and self-healing efficiency.

关键词： Self-healing 5-Acetylaminopentyl acrylate Hydrogen bond Emulsion copolymerization

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Synthesis and morphology control of raspberry-like poly(ethylene terephthalate)/polyacrylonitrile microspheres

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Chinese Chemical Letters 2016年第2期27卷 195-199页

作者： Yong-Fei Xu mo-zhen wang Qi-Chao Wu Xiao Zhou Xue-Wu Ge CAS Key Laboratory of Soft Matter Chemistry Department of Polymer Science and Engineering University of Science and Technology of China School of Materials and Chemical Engineering Anhui Jianzhu University Guangdong Tianan New Material Co. Ltd.

The fabrication of raspberry-like poly（ethylene terephthalate）/polyacrylonitrile（PET/PAN） microspheres by g-ray radiation-induced polymerization of acrylonitrile on micron-sized PET microspheres were first reported in this work. A PET emulsion was firstly prepared by dispersing a PET solution with 1,1,2,2-tetrachloroethane/phenol mixture as the solvent into an aqueous solution of sodium dodecyl ***, PET microspheres were formed by precipitating the PET emulsion droplets from ethanol. The influence of the PET solvent and the weight ratio of ethanol to PET emulsion on the morphology of the PET microspheres had been investigated. After the surface of the prepared PET microspheres was grafted with poly（acrylic acid）, the grafting polymerization of AN also had been successfully initiated by g-ray radiation to form PAN microspheres with a size of about 100 nm on the PET microspheres. This work provides a new method to fabricate micron-sized PET microspheres, and further expands the functionalization of PET and its application fields.

关键词： PET emulsion Emulsion precipitation PET microsphere Raspberry-like microsphere PET/PAN composite microspheres

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THERMALLY STIMULATED SHAPE MEmoRY BEHAVIOR OF(ETHYLENE OXIDE-BUTYLENE TEREPHTHALATE)SEGMENTED COPOLYMER

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Chinese Journal of Polymer Science 2000年第4期18卷 357-361页

作者： Xiao-lie Luo Ming-chuan Zhao mo-zhen wang Lu-na Ding De-zhu Ma Department of Polymer Science and Engineering, University of Science and Technology of China, Hefei 230026, China 中国科学技术大学安徽合肥

The thermally stimulated shape memory behavior of ethylene oxide-butylene terephthalate (EOBT) segmented copolymers with different soft segment molecular weight and hard segment content was investigated. The deformation recovery ratio R-f of the EOBT samples increases with the soft segment molecular weight and the hard segment weight content, while the average overall deformation recovery speed V-r increases with the hard segment content. The temperature of maximum deformation recovery speed (T-M) is determined by the melting temperature of the soft segment crystals and the stability of the crystallized hard segment domains.

关键词： ethylene oxide-butylene terephthalate segmented copolymers shape memory crystallized hard segment

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Number of Solitons Emerged in the Initial Profile of Shallow Water Using Convolutional Neural Networks

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Journal of Systems Science & Complexity 2024年第2期37卷 463-479页

作者： wang zhen CUI Shikun School of Mathematical Sciences Dalian University of TechnologyDalian 116024China School of Mathematical Sciences Beihang UniversityBeijing 100191China

The soliton resolution conjecture proposes that the initial value problem can evolve into a dispersion part and a soliton ***,the problem of determining the number of solitons that form in a given initial profile remains unsolved,except for a few specific *** this paper,the authors use the deep learning method to predict the number of solitons in a given initial value of the Korteweg-de Vries(KdV)*** leveraging the analytical relationship between Asech^(2)(x)initial values and the number of solitons,the authors train a Convolutional Neural Network(CNN)that can accurately identify the soliton count from spatio-temporal *** trained neural network is capable of predicting the number of solitons with other given initial values without any additional *** extensive calculations,the authors demonstrate the effectiveness and high performance of the proposed method.

关键词： Convolutional neural network deep learning method KdV equation soliton

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A new quantity in Finsler geometry

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Science China Mathematics 2024年第4期67卷 883-890页

作者： Xiaohuan mo Xiaoyang wang Key Laboratory of Pure and Applied Mathematics School of Mathematical SciencesPeking UniversityBeijing 100871China School of Mathematics and Statistics Beijing Institute of TechnologyBeijing 100081China

In this paper,we study a new Finslerian quantity■defined by the T-curvature and the angular metric *** show that the■-curvature not only gives a measure of the failure of a Finsler metric to be of scalar flag curvature but also has a vanishing *** find that the■-curvature is closely related to the Riemann curvature,the Matsumoto torsion and theΘ-*** solve ***’s open problem in terms of the■-***,we give a global rigidity result for Finsler metrics of negative Ricci curvature on a compact manifold via the■-curvature,generalizing a theorem previously only known in the case of negatively curved Finsler metrics of scalar flag curvature.

关键词： Finsler metric Finslerian quantity T-curvature -curvature Randers metric

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Gamma Ray Radiation Effect on Bi2WO6 Photocatalyst

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Chinese Journal of Chemical Physics 2018年第5期31卷 701-706,736页

作者： Qiang Zhang Zhi-wen Jiang mo-zhen wang Xue-wu Ge CAS Key Laboratory of Soft Matter Chemistry Department of Polymer Science and EngineeringUniversity of Science and Technology of ChinaHefei 230026China

The development of Bi2WO6-based materials has become one of research hotspots due to the increasing demands on high-efficient photocatalyst responding to visible *** this work,the effect of high energy radiation(γ-ray)on the structure and the photocatalytic activity of Bi2WO6 nanocrystals was first *** morphological change of Bi2WO6 nanocrystals was observed by SEM underγ-ray ***,the XRD spectra of the irradiated Bi2WO6 nanocrystals showed the characteristic 2θof(113)plane shifts slightly from 28.37o to 28.45o with the increase of the absorbed dose,confirming the change in the crystal structure of *** XPS results proved the crystal structure change was originated from the generation of oxygen vacancy defects under high-dose *** photocatalytic activity of Bi2WO6 on the decomposition of methylene blue(MB)in water under visible light increases gradually with the increase of absorbed ***,the improved photocatalytic performance of the irradiated Bi2WO6 nanocrystals remained after three cycles of photocatalysis,indicating a good stability of the created oxygen vacancy *** work gives a new simple way to improve photocatalytic performance of Bi2WO6 through creating oxygen vacancy defects in the crystal structure by-ray radiation.

关键词： Bi2WO6 Gamma ray Oxygen vacancy Visible-light photocatalyst

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