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Poly(3-hexylthio) thiophene Field-effect Transistor Device Performance: Impact of the Content of Hexylthio Side Chain on Backbone

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Chinese Journal of Polymer Science 2024年第1期42卷 14-23,I0005页

作者： Hao-Yu Liu Lian-He Han Ling-Wei Kong Li-Ping zhu Xiao-Lan Qiao mei-fang zhu State Key Laboratory for Modification of Chemical Fibers and Polymer Materials College of Materials Science and EngineeringDonghua UniversityShanghai 201620China School of Electronic Information and Electrical Engineering Shanghai Jiao Tong UniversityShanghai 200240China

Regioregular poly(3-hexylthio)thiopene(P3HTT) has emerged tremendous potential in organic electronic applications due to the strong noncovalent interactions from the sulfur atom linked to thiophene. However, P3HTT generally exhibits low charge mobility mostly due to poor solution processability attributed to dense arrangement of hexylthio side chain in polymer, which led to strong noncovalent interactions among sulfur atoms. To balance the nonvalent interaction and aggregation for P3HTT, herein, we systematically study the effect of hexylthio side chain content in polymer backbone on the structure and properties. A series of regioregular P3HTT-based homopolymers(P3HTT, P3HTT-50,P3HTT-33 and P3HTT-25) were prepared via Kumada catalyst transfer polycondensation method from a set of mono-, bi-, ter-and quarterthiophenes containing different contents of hexylthio side chain. The DFT calculation shows the planarity of polymers backbone could be improved through reducing the density of hexylthio side chain in polymer mainchain. And significant changes in their crystallinity, aggregation and optical properties were observed with the content of hexylthio side chain reducing. The P3HTT-33 displayed the highest field-effect transistor hole mobility of 2.83×10^(-2) cm^(2)·V^(-1)·s^(-1) resulting from a balance between the crystallinity and planarity. This study demonstrates modulating the content of hexylthio side chain in P3HTT is an effective strategy to optimize the opto-electronic properties of polymer obtaining excellent semiconductor device performance.

关键词： Conjugated polymer Polythiophene Noncovalent interaction Molecular aggregation Organic field-effect transistor

Fibers Make a Better Life

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Chinese Journal of Polymer Science 2022年第4期40卷 331-332页

作者： Li-Ping zhu Shu-Guang Yang mei-fang zhu State Key Laboratory for Modification of Chemical Fibers&Polymer Materials College of Materials Science&EngineeringDonghua UniversityShanghai 201620China

Naturally occurring fibers,such as cotton,flax,silk,and wool have been utilized by mankind for *** silk gauze gown of Han-dynasty found in 1972 by archaeological discovery in Mawangdui Han Tomb weighs only 49 *** demonstrates the advanced silkworm cultivation,harvesting and weaving techniques in the early Han Dynasty in *** today,we are not able to replicate this silk gown with such light *** a long time.

关键词： wool harvesting silk

The Crystallization,Melting Behaviors and Thermal Stability of Cross-linked Poly(3-hydroxybutyrate-co-3-hydroxyvalerate) by Octavinyloctasilasesquioxane

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Chinese Journal of Polymer Science 2018年第12期36卷 1353-1360页

作者： Heng-Xue Xiang Fatemeh Zabihi Xu-Zhen Zhang mei-fang zhu State Key Laboratory for Modification of Chemical Fibers and Polymer Materials College of Materials Science and Engineering Donghua University The Key Laboratory of Advanced Textile Materials and Manufacturing Technology of Ministry of Education College of Materials and Textile Zhejiang SciTech University

A series of cross-linked poly（3-hydroxybutyrate-co-3-hydroxyvalerate）/octavinyloctasilasesquioxane （PHBWOVS） composites were obtained by a simple melt reactive processing technique. Dicumyl peroxide （DCP） and OVS were employed as a free radical initiator and a cross-linking agent, respectively. The chemical structure of these produced composites were identified by 1H/13C/29Si-nuclear magnetic resonance spectroscopy （1H/13C/29Si-NMR） and Fourier transform infrared spectroscopy （FTIR）. The melting behavior, non-isothermal crystallization, spherulite morphology and thermal stability property of PHBV/OVS composites were also investigated. The nucleation behaviors and crystallization rate of PHBV/OVS were significantly enhanced with the formation of cross-linked networks with different side-chains and cross-linking points. The red shift of crystalline peak temperature with addition of a small amount of OVS content evidenced the higher crystalline ability compared with the neat PHBV. However there was a threshold content, beyond which the crystallization rate weakened again. Additionally, the cross-linked structure of PHBV/OVS composites could be adjusted by changing the amount of OVS.

关键词： Biodegradable PHBV Reactive processing Crystallization behavior Composite

Reactive oxygen species are involved in cell death in wheat roots against powdery mildew

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Journal of Integrative Agriculture 2019年第9期18卷 1961-1970页

作者： LI Cheng-yang ZHANG Nan GUAN Bin ZHOU zhu-qing mei fang-zhu Laboratory of Cell Biology College of Life Science and TechnologyHuazhong Agricultural UniversityWuhan 430070P.R.China College of Plant Sciences&Technology Huazhong Agricultural UniversityWuhan 430070P.R.China

Inoculation of wheat(Triticum aestivum L.)leaves with wheat powdery mildew fungus(Blumeria graminis ***)induces the cell death in adventitious *** oxygen species(ROS)play a key role in respond to biotic stress in *** study the involvement of ROS and the degree of cell death in the wheat roots following inoculation,ROS levels and microstructure of root cells were analyzed in two wheat cultivars that are susceptible(Huamai 8)and resistant(Shenmai 8)to powdery mildew *** 18 d after powdery mildew fungus inoculation,only Huamai 8 displayed the leaf lesions,while root cell death occurred in both *** 8 had a high level of ROS accumulation,which is associated with increased root cell degradation,while in Shenmai 8,there was little ROS accumulation correlating with slight root cell *** molecular study about the expression levels of ROS scavenging genes(MnSOD and CAT)in wheat roots showed that these genes expression decreased after the leaves of wheat was *** difference between Huamai 8 and Shenmai 8 on subcellular localization of H2 O2 and O2^–·was corresponded with the different down-regulation of the genes encoding for superoxide dismutase and catalase in two wheat *** results suggested that ROS were involved in the process by which powdery mildew fungus induced cell death in wheat roots.

关键词： powdery mildew wheat(Triticum aestivum L.) reactive oxygen species ultrastructure programmed cell death

Recent Advances in Bio-Inspired Versatile Polydopamine Platforms for “Smart” Cancer Photothermal Therapy

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Chinese Journal of Polymer Science 2023年第5期41卷 699-712,I0007页

作者： Zhi-Yuan Ma Dan-Ya Li Xin Jia Rui-Li Wang mei-fang zhu State Key Laboratory for Modification of Chemical Fibers and Polymer Materials College of Materials Science and EngineeringDonghua UniversityShanghai 201620China Key Laboratory for Green Processing of Chemical Engineering of Xinjiang Bingtuan School of Chemistry and Chemical EngineeringShihezi UniversityShihezi 832003China

Although photothermal therapy(PTT)has been developed for fighting cancers,the degradative,toxic,and metabolic nature of photothermal conversion materials(PCMs)has prevented them from being clinically *** advantage of the surface modification strategy of mussel-inspired dopamine chemistry and its excellent photothermal conversion effect,polydopamine(Pdop)represents a versatile PTT platform,providing strategies and methods for the construction of novel Pdop-functionalized *** to its adhesion and secondary reactivity,Pdop can be deposited on virtually all substrates to improve their bioavailability and ***-based PCMs could not be only functionalized with small biomolecules via chemical bonds and/or noncovalent force but also modified with functional polymers via either the“grafting to”or“grafting from”*** review highlights the synthetic methods,therapeutic strategies,and designs of PCMs based on Pdop in recent years to explore its scope and limitations.

关键词： Polydopamine Photothermal therapy Drug delivery systems Polymers Tumor theranostics

Unusual magnetic resonance imaging findings of brain and leptomeningeal metastasis in lung adenocarcinoma:A case report

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World Journal of Clinical Cases 2022年第5期10卷 1723-1728页

作者： Na Li Yu-Jun Wang fang-mei zhu Shui-Tang Deng Department of Radiology Tongde Hospital of Zhejiang ProvinceHangzhou 310012Zhejiang ProvinceChina Department of Radiology Zhejiang Provincial Hospital of Chinese MedicineHangzhou 310012Zhejiang ProvinceChina

BACKGROUND Metastatic tumors are the most common malignancies of central nervous system in adults,and the frequent primary lesion is lung *** and leptomeningeal metastases are more common in patients with non-small-cell lung cancer harboring epidermal growth factor receptor ***,the coexist of brain metastasis with leptomeningeal metastasis(LM)in isolated gyriform appearance is *** SUMMARY We herein presented a case of a 76-year-old male with an established diagnosis as lung adenocarcinoma with gyriform-appeared cerebral parenchymal and leptomeningeal metastases,accompanied by mild peripheral edema and avid contrast enhancement on magnetic resonance *** and pathological examinations confirmed the brain and leptomeningeal metastatic lesions in the left frontal cortex,subcortical white matter and local *** This case was unique with respect to the imaging findings of focal gyriform appearance,which might be caused by secondary parenchymal brain metastatic tumors invading into the leptomeninges or coexistence with *** should be aware of this uncommon imaging presentation of tumor metastases to the central nervous system.

关键词： Brain metastasis Leptomeningeal metastasis Magnetic resonance imaging Lung cancer Epidermal growth factor receptor Case report

Novel flexible broadband microwave absorptive fabrics coated with graphite nanosheets/polyurethane nanocomposites

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Progress in Natural Science:Materials International 2012年第4期22卷 288-294页

作者： Miao-miao Yu Shao-hua Chen Zhe Zhou mei-fang zhu State Key Laboratory for Modification of Chemical Fiber and Polymer Materials College of Materials Science and EngineeringDonghua University

Graphite nanosheets (GNS) were prepared by surfactant assisted ultrasonication from expanded graphite (EG) and followed by coating onto vinylon fabrics with water-borne polyurethane (WPU). The morphology of GNS and GNS/polyurethane (PU) coatings was characterized by field emission scanning electron microscope (FESEM), and the structure of GNS was studied by fourier transform infrared (FTIR) spectroscopy. Electromagnetic (EM) parameters indicated that GNS is a kind of dielectric loss material, in which little magnetic loss is found. Reflection loss (RL) results showed that both GNS content and coated thickness had great influences on the microwave absorption. For the fabric coated with GNS/PU nanocomposites (30/100 by weight, wet thickness of 0.39 mm for dry areal density in 130g/m2 ), RL values exceeding 5dB could be obtained in the frequency range of 10.7-18GHz, while 10dB in 12.7-18GHz, and a minimum value of 28dB at 15.2GHz. These GNS/PU coated fabrics are light and flexible with much thin and low-cost coated layer, and showed great potential in radar camouflaging and electromagnetic interference application.

关键词： Microwave absorption Graphite nanosheets Water-borne polyur-ethane Ultrasonication Coated fabrics

A General Strategy for Efficiently Constructing Multifunctional Cluster Fillers Using a Three-Fluid Nozzle Spray Drying Technique for Dental Restoration

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Engineering 2022年第1期8卷 138-147页

作者： Dan-Lei Yang Dan Wang Hao Niu Rui-Li Wang mei Liu Fei-Min Zhang Jie-Xin Wang mei-fang zhu State Key Laboratory of Organic–Inorganic Composites Beijing University of Chemical TechnologyBeijing 100029China Research Center of the Ministry of Education for High Gravity Engineering and Technology Beijing University of Chemical TechnologyBeijing 100029China State Key Laboratory for Modification of Chemical Fibers and Polymer Materials College of Materials Science and EngineeringDonghua UniversityShanghai 201620China Jiangsu Key Laboratory of Oral Diseases Department of ProsthodonticsAffiliated Hospital of StomatologyNanjing Medical UniversityNanjing 210029China

Multifunctional fillers are greatly required for dental resin composites(DRCs).In this work,a spray dryer with a three-fluid nozzle was applied for the first time to construct high-performance complex nanoparticle clusters(CNCs)consisting of different functional nanofillers for dental *** application of a three-fluid nozzle can effectively avoid the aggregation of different nanoparticles with opposite zeta potentials before the spray drying process in order to construct regularly shaped *** a SiO_(2)–ZrO_(2) binary system,the SiO_(2)–ZrO_(2) CNCs constructed using a three-fluid nozzle maintained their excellent mechanical properties((133.3±4.7)MPa,(8.8±0.5)GPa,(371.1±13.3)MPa,and(64.5±0.7)HV for flexural strength,flexural modulus,compressive strength,and hardness of DRCs,respectively),despite the introduction of ZrO_(2) nanoparticles,whereas their counterparts constructed using a two-fluid nozzle showed significantly decreased mechanical ***,heat treatment of the SiO_(2)-ZrO_(2) CNCs significantly improved the mechanical properties and radiopacity of the *** DRCs containing over 10%mass fraction ZrO_(2) nanoparticles can meet the requirement for radiopaque *** importantly,this method can be expanded to ternary or quaternary *** filled with SiO_(2)-ZrO_(2)-ZnO CNCs with a ratio of 56:10:4 displayed high antibacterial activity(antibacterial ratio>99%)in addition to excellent mechanical properties and ***,the three-fluid nozzle spray drying technique holds great potential for the efficient construction of multifunctional cluster fillers for DRCs.

关键词： Multifunctional cluster fillers Three-fluid nozzle spray drying Mechanical properties Antibacterial activity Radiopacity Dental resin composites

Structural and magnetic properties of micropolycrystalline cobalt thin films fabricated by direct current magnetron sputtering

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International Journal of Minerals,Metallurgy and Materials 2024年第2期31卷 384-394页

作者： Kerui Song Zhou Li mei fang zhu Xiao Qian Lei School of Materials Science and Engineering Central South UniversityChangsha 410083China State Key Laboratory of Powder Metallurgy Central South UniversityChangsha 410083China Hunan Key Laboratory of Super-Microstructure and Ultrafast Process School of Physics and electronicsCentral South UniversityChangsha 410083China Key Laboratory of Non-Ferrous Metal Materials Science and Engineering Ministry of EducationChangsha 410083China

Pure cobalt(Co)thin films were fabricated by direct current magnetron sputtering,and the effects of sputtering power and pres-sure on the microstructure and electromagnetic properties of the films were *** the sputtering power increases from 15 to 60 W,the Co thin films transition from an amorphous to a polycrystalline state,accompanied by an increase in the intercrystal pore ***,the resistivity decreases from 276 to 99μΩ·cm,coercivity increases from 162 to 293 Oe,and in-plane magnetic aniso-tropy *** the sputtering pressure decreases from 1.6 to 0.2 Pa,grain size significantly increases,resistivity significantly de-creases,and the coercivity significantly increases(from 67 to 280 Oe),which can be attributed to the increase in defect ***-pondingly,a quantitative model for the coercivity of Co thin films was *** polycrystalline films sputtered under pressures of 0.2 and 0.4 Pa exhibit significant in-plane magnetic anisotropy,which is primarily attributable to increased microstress.

关键词： cobalt thin film magnetron sputtering microstructure electromagnetic properties